Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica
The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
E. Sánchez-Olquín [verfasserIn] G. Arrieta-Espinoza [verfasserIn] A.M. Espinoza Esquivel [verfasserIn] |
|---|
| Format: |
E-Artikel |
|---|---|
| Sprache: |
Englisch ; Spanisch ; Portugiesisch |
| Erschienen: |
2007 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Planta Daninha - Sociedade Brasileira da Ciência das Plantas Daninhas, 2004, 25(2007), 1, Seite 13-23 |
|---|---|
| Übergeordnetes Werk: |
volume:25 ; year:2007 ; number:1 ; pages:13-23 |
| Links: |
|---|
| DOI / URN: |
10.1590/S0100-83582007000100002 |
|---|
| Katalog-ID: |
DOAJ060798114 |
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| 245 | 1 | 0 | |a Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica |
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| 520 | |a The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. | ||
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10.1590/S0100-83582007000100002 doi (DE-627)DOAJ060798114 (DE-599)DOAJ4ec553c21c7c4c3db18951675f4d02fd DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E. Sánchez-Olquín verfasserin aut Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. sobreposição de floração fases de desenvolvimento arroz-daninho variedades de arroz anthesis overlapping growth stages red rice rice varieties Biology (General) Botany G. Arrieta-Espinoza verfasserin aut A.M. Espinoza Esquivel verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 25(2007), 1, Seite 13-23 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:25 year:2007 number:1 pages:13-23 https://doi.org/10.1590/S0100-83582007000100002 kostenfrei https://doaj.org/article/4ec553c21c7c4c3db18951675f4d02fd kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582007000100002 kostenfrei https://doaj.org/toc/0100-8358 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 25 2007 1 13-23 |
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10.1590/S0100-83582007000100002 doi (DE-627)DOAJ060798114 (DE-599)DOAJ4ec553c21c7c4c3db18951675f4d02fd DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E. Sánchez-Olquín verfasserin aut Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. sobreposição de floração fases de desenvolvimento arroz-daninho variedades de arroz anthesis overlapping growth stages red rice rice varieties Biology (General) Botany G. Arrieta-Espinoza verfasserin aut A.M. Espinoza Esquivel verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 25(2007), 1, Seite 13-23 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:25 year:2007 number:1 pages:13-23 https://doi.org/10.1590/S0100-83582007000100002 kostenfrei https://doaj.org/article/4ec553c21c7c4c3db18951675f4d02fd kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582007000100002 kostenfrei https://doaj.org/toc/0100-8358 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 25 2007 1 13-23 |
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10.1590/S0100-83582007000100002 doi (DE-627)DOAJ060798114 (DE-599)DOAJ4ec553c21c7c4c3db18951675f4d02fd DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E. Sánchez-Olquín verfasserin aut Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica 2007 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. sobreposição de floração fases de desenvolvimento arroz-daninho variedades de arroz anthesis overlapping growth stages red rice rice varieties Biology (General) Botany G. Arrieta-Espinoza verfasserin aut A.M. Espinoza Esquivel verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 25(2007), 1, Seite 13-23 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:25 year:2007 number:1 pages:13-23 https://doi.org/10.1590/S0100-83582007000100002 kostenfrei https://doaj.org/article/4ec553c21c7c4c3db18951675f4d02fd kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582007000100002 kostenfrei https://doaj.org/toc/0100-8358 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ GBV_ILN_20 GBV_ILN_22 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 25 2007 1 13-23 |
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QH301-705.5 QK1-989 Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica sobreposição de floração fases de desenvolvimento arroz-daninho variedades de arroz anthesis overlapping growth stages red rice rice varieties |
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Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica |
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Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica |
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E. Sánchez-Olquín G. Arrieta-Espinoza A.M. Espinoza Esquivel |
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vegetative and reproductive development of costa rican weedy rice compared with commercial rice (oryza sativa) comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (oryza sativa) da costa rica |
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Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica |
| abstract |
The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. |
| abstractGer |
The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. |
| abstract_unstemmed |
The variability in the chronology of the vegetative and reproductive development of weedy rice complex has been little studied. However, a field trial was established to study the timing of growth stages of sixteen weedy rice morphotypes and five rice varieties of Costa Rica. Weedy rice presented a wide range of variation for all descriptors among and within morphotypes. Weedy rice was taller than the rice varieties during vegetative phase and showed a growth increase of 14-23 cm every two weeks. Six morphotypes emerged earlier than commercial rice varieties, but no differences where found between samples for the time required for starting tillering. Early emergence of weedy rice morphotypes was not associated with early flowering, thus no correlation was detected between the vegetative and reproductive phases. All weedy rice morphotypes reached anthesis and maturity earlier than the rice varieties. Nevertheless, varieties Setesa-9 and CR-5272 overlapped anthesis with eleven morphotypes and variety CR-4338 overlapped flowering with eight weedy rice morphotypes. In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. Essa informação será útil para o desenho de estudos do fluxo gênico entre a planta daninha e o cultivo. |
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Vegetative and reproductive development of Costa Rican weedy rice compared with commercial rice (Oryza sativa) Comparação do desenvolvimento vegetativo e reprodutivo do arroz-vermelho e variedades comerciais de arroz (Oryza sativa) da Costa Rica |
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In contrast, none of the morphotypes overlapped anthesis with varieties CR-1821 and CR-1113. The results obtained showed the competitive capacity of weedy rice and provided valuable information about flowering overlap between weedy rice morphotypes and rice varieties which will be useful in the design of gene flow studies among them.<br<O desenvolvimento vegetativo e reprodutivo das diferentes variantes morfológicas do arroz-vermelho tem sido pouco estudado. Um ensaio de campo com dezesseis morfotipos de arroz-vermelho e cinco variedades comerciais de arroz da Costa Rica foi estabelecido com o fim de estudar o crescimento dessa planta daninha. Nos resultados, observou-se que o arroz-vermelho mostrou amplo intervalo de variação durante seu ciclo de vida. Em geral, essas plantas foram mais altas que as variedades durante a fase vegetativa e apresentaram incrementos de altura entre 14 e 23 cm quinzenal. Seis dos morfotipos avaliados emergiram antes que as variedades comerciais de arroz, porém nao foram detectadas diferenças entre as amostras quanto ao momento em que iniciaram o perfilhamento. Os morfotipos que emergiram primeiro não foram os mesmos que alcançaram a floração primeiro; por esse motivo, não se pode estabelecer correlação entre a fase vegetativa e a reprodutiva. Todos os tipos de arroz-vermelho floresceram e amadureceram sua semente antes das cinco variedades comerciais de arroz. Entretanto, as variedades Setesa-9 y CR 5272 sobreporam em floração com onze morfotipos. Em contraste, as variedades CR 1821 e CR 1113 não sobreporam em floração com nenhum dos morfotipos avaliados. Os dados obtidos mostram a capacidade competitiva do arroz-vermelho e, ao mesmo tempo, dão informação valiosa sobre as sobreposições de floração entre morfotipos de arroz-vermelho e as variedades comerciais de arroz. 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