Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes
Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
E.A. Ferreira [verfasserIn] A.J. Demuner [verfasserIn] A.A. Silva [verfasserIn] J.B. Santos [verfasserIn] M.C. Ventrella [verfasserIn] A.E. Marques [verfasserIn] S.O. Procópio [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch ; Spanisch ; Portugiesisch |
| Erschienen: |
2005 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Planta Daninha - Sociedade Brasileira da Ciência das Plantas Daninhas, 2004, 23(2005), 4, Seite 611-619 |
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| Übergeordnetes Werk: |
volume:23 ; year:2005 ; number:4 ; pages:611-619 |
| Links: |
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| DOI / URN: |
10.1590/S0100-83582005000400008 |
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| Katalog-ID: |
DOAJ065615433 |
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| 520 | |a Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. | ||
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10.1590/S0100-83582005000400008 doi (DE-627)DOAJ065615433 (DE-599)DOAJ635b966cebd24135b0f5445cbd9f222a DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E.A. Ferreira verfasserin aut Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. composição química Saccharum spp. micromorfologia foliar cromatografia a gás chemical composition leaf micro-morphology gas chromatography Biology (General) Botany A.J. Demuner verfasserin aut A.A. Silva verfasserin aut J.B. Santos verfasserin aut M.C. Ventrella verfasserin aut A.E. Marques verfasserin aut S.O. Procópio verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 23(2005), 4, Seite 611-619 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:23 year:2005 number:4 pages:611-619 https://doi.org/10.1590/S0100-83582005000400008 kostenfrei https://doaj.org/article/635b966cebd24135b0f5445cbd9f222a kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582005000400008 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 23 2005 4 611-619 |
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10.1590/S0100-83582005000400008 doi (DE-627)DOAJ065615433 (DE-599)DOAJ635b966cebd24135b0f5445cbd9f222a DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E.A. Ferreira verfasserin aut Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. composição química Saccharum spp. micromorfologia foliar cromatografia a gás chemical composition leaf micro-morphology gas chromatography Biology (General) Botany A.J. Demuner verfasserin aut A.A. Silva verfasserin aut J.B. Santos verfasserin aut M.C. Ventrella verfasserin aut A.E. Marques verfasserin aut S.O. Procópio verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 23(2005), 4, Seite 611-619 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:23 year:2005 number:4 pages:611-619 https://doi.org/10.1590/S0100-83582005000400008 kostenfrei https://doaj.org/article/635b966cebd24135b0f5445cbd9f222a kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582005000400008 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 23 2005 4 611-619 |
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10.1590/S0100-83582005000400008 doi (DE-627)DOAJ065615433 (DE-599)DOAJ635b966cebd24135b0f5445cbd9f222a DE-627 ger DE-627 rakwb eng spa por QH301-705.5 QK1-989 E.A. Ferreira verfasserin aut Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes 2005 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. composição química Saccharum spp. micromorfologia foliar cromatografia a gás chemical composition leaf micro-morphology gas chromatography Biology (General) Botany A.J. Demuner verfasserin aut A.A. Silva verfasserin aut J.B. Santos verfasserin aut M.C. Ventrella verfasserin aut A.E. Marques verfasserin aut S.O. Procópio verfasserin aut In Planta Daninha Sociedade Brasileira da Ciência das Plantas Daninhas, 2004 23(2005), 4, Seite 611-619 (DE-627)391334867 (DE-600)2152315-0 01008358 nnns volume:23 year:2005 number:4 pages:611-619 https://doi.org/10.1590/S0100-83582005000400008 kostenfrei https://doaj.org/article/635b966cebd24135b0f5445cbd9f222a kostenfrei http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582005000400008 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 23 2005 4 611-619 |
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A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. 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QH301-705.5 QK1-989 Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes composição química Saccharum spp micromorfologia foliar cromatografia a gás chemical composition leaf micro-morphology gas chromatography |
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composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes |
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Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes |
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Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. |
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Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. |
| abstract_unstemmed |
Objetivou-se neste trabalho avaliar a composição química da cera epicuticular e caracterizar a superfície foliar dos cultivares de cana-de-açúcar RB855113 (sensível à mistura de herbicidas trifloxysulfuron-sodium + ametryn), SP80-1842 e SP80-1816, do clone RB957689 (com média sensibilidade à mistura de herbicidas) e do cultivar RB867515 (tolerante). A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. In relation to leaf micro-morphology, no relevant differences were found. |
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Composição química da cera epicuticular e caracterização da superfície foliar em genótipos de cana-de-açúcar Chemical composition of epicuticular wax and characterization of leaf surface in sugarcane genotypes |
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A cera epicuticular foi extraída e quantificada e os seus constituintes analisados por cromatografia a gás, acoplada a espectrômetro de massa (CG-EM). Para determinação da composição química, assim como a caracterização da superfície foliar dos cultivares avaliados, amostras de lâmina foliar foram coletadas e submetidas à microscopia eletrônica de varredura, para caracterização das faces adaxial e abaxial. A análise das amostras revelou a presença de hidrocarbonetos, esteróides, ésteres graxos, álcoois e aldeídos. A cera do cultivar sensível à mistura (RB855113) apresentou menor número de componentes químicos e predominância de ésteres graxos de cadeia mais curta que os encontrados nos demais cultivares, bem como pequena proporção de esteróides e hidrocarbonetos. Nos cultivares com média sensibilidade (SP80-1842 e RB867515), a cera apresentou maior proporção de hidrocarbonetos e esteróides. A cera do cultivar RB855113 apresentou polaridade intermediária, porém menos polar que a cera do cultivar RB867515 (tolerante à mistura). Não foram observadas diferenças marcantes entre os cultivares no que se refere à micromorfologia foliar.<br<This study aimed to evaluate the chemical composition of epicuticular wax and to characterize leaf surface in the sugarcane cultivars RB85113 (sensitive to trifloxysulfuron-sodium + ametryn), SP80 1842, SP80 1816, clone RB957689 (with medium sensitivity to trifloxysulfuron-sodium + ametryn) and the cultivar RB867515 (tolerant). Epicuticular wax was extracted and quantified, and its contents submitted to gas chromatography coupled to a mass spectrometer. Samples of foliar slides were collected and submitted to electron scanning microscopy to characterize adaxial and abaxial sides, and to determine the chemical composition. This analysis showed the presence of hydrocarbon, steroids, fatty esters, alcohols and aldehyde. The cultivar RB85113 presented wax with lower chemical composition, predominance of fatty esters and low ratio of hydrocarbon. In SP80 1842 and RB867515, the wax presented higher hydrocarbon and steroid ratio. Wax polarity was intermediate in RB85113 but higher in RB867515. 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