Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta
The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Charalampous, Nikolina [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2019transfer abstract |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners - Fetters, Lisa ELSEVIER, 2021, EES : official journal of the International Society of Ecotoxicology and Environmental safety, Amsterdam |
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| Übergeordnetes Werk: |
volume:182 ; year:2019 ; day:30 ; month:10 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1016/j.ecoenv.2019.109413 |
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ELV047506334 |
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| 520 | |a The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. | ||
| 520 | |a The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. | ||
| 650 | 7 | |a Dunaliella tertiolecta |2 Elsevier | |
| 650 | 7 | |a Photosynthetic apparatus |2 Elsevier | |
| 650 | 7 | |a Algal growth |2 Elsevier | |
| 650 | 7 | |a Burkholderia thailandensis |2 Elsevier | |
| 650 | 7 | |a Energy flux |2 Elsevier | |
| 650 | 7 | |a Rhamnolipids |2 Elsevier | |
| 700 | 1 | |a Grammatikopoulos, Giorgos |4 oth | |
| 700 | 1 | |a Kourmentza, Constantina |4 oth | |
| 700 | 1 | |a Kornaros, Michael |4 oth | |
| 700 | 1 | |a Dailianis, Stefanos |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Fetters, Lisa ELSEVIER |t Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners |d 2021 |d EES : official journal of the International Society of Ecotoxicology and Environmental safety |g Amsterdam |w (DE-627)ELV006765629 |
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10.1016/j.ecoenv.2019.109413 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001322.pica (DE-627)ELV047506334 (ELSEVIER)S0147-6513(19)30743-2 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl Charalampous, Nikolina verfasserin aut Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta 2019transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. Dunaliella tertiolecta Elsevier Photosynthetic apparatus Elsevier Algal growth Elsevier Burkholderia thailandensis Elsevier Energy flux Elsevier Rhamnolipids Elsevier Grammatikopoulos, Giorgos oth Kourmentza, Constantina oth Kornaros, Michael oth Dailianis, Stefanos oth Enthalten in Elsevier Fetters, Lisa ELSEVIER Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners 2021 EES : official journal of the International Society of Ecotoxicology and Environmental safety Amsterdam (DE-627)ELV006765629 volume:182 year:2019 day:30 month:10 pages:0 https://doi.org/10.1016/j.ecoenv.2019.109413 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.63 Krankenpflege VZ AR 182 2019 30 1030 0 |
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10.1016/j.ecoenv.2019.109413 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001322.pica (DE-627)ELV047506334 (ELSEVIER)S0147-6513(19)30743-2 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl Charalampous, Nikolina verfasserin aut Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta 2019transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. Dunaliella tertiolecta Elsevier Photosynthetic apparatus Elsevier Algal growth Elsevier Burkholderia thailandensis Elsevier Energy flux Elsevier Rhamnolipids Elsevier Grammatikopoulos, Giorgos oth Kourmentza, Constantina oth Kornaros, Michael oth Dailianis, Stefanos oth Enthalten in Elsevier Fetters, Lisa ELSEVIER Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners 2021 EES : official journal of the International Society of Ecotoxicology and Environmental safety Amsterdam (DE-627)ELV006765629 volume:182 year:2019 day:30 month:10 pages:0 https://doi.org/10.1016/j.ecoenv.2019.109413 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.63 Krankenpflege VZ AR 182 2019 30 1030 0 |
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10.1016/j.ecoenv.2019.109413 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001322.pica (DE-627)ELV047506334 (ELSEVIER)S0147-6513(19)30743-2 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl Charalampous, Nikolina verfasserin aut Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta 2019transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. Dunaliella tertiolecta Elsevier Photosynthetic apparatus Elsevier Algal growth Elsevier Burkholderia thailandensis Elsevier Energy flux Elsevier Rhamnolipids Elsevier Grammatikopoulos, Giorgos oth Kourmentza, Constantina oth Kornaros, Michael oth Dailianis, Stefanos oth Enthalten in Elsevier Fetters, Lisa ELSEVIER Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners 2021 EES : official journal of the International Society of Ecotoxicology and Environmental safety Amsterdam (DE-627)ELV006765629 volume:182 year:2019 day:30 month:10 pages:0 https://doi.org/10.1016/j.ecoenv.2019.109413 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.63 Krankenpflege VZ AR 182 2019 30 1030 0 |
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10.1016/j.ecoenv.2019.109413 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001322.pica (DE-627)ELV047506334 (ELSEVIER)S0147-6513(19)30743-2 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl Charalampous, Nikolina verfasserin aut Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta 2019transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. Dunaliella tertiolecta Elsevier Photosynthetic apparatus Elsevier Algal growth Elsevier Burkholderia thailandensis Elsevier Energy flux Elsevier Rhamnolipids Elsevier Grammatikopoulos, Giorgos oth Kourmentza, Constantina oth Kornaros, Michael oth Dailianis, Stefanos oth Enthalten in Elsevier Fetters, Lisa ELSEVIER Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners 2021 EES : official journal of the International Society of Ecotoxicology and Environmental safety Amsterdam (DE-627)ELV006765629 volume:182 year:2019 day:30 month:10 pages:0 https://doi.org/10.1016/j.ecoenv.2019.109413 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.63 Krankenpflege VZ AR 182 2019 30 1030 0 |
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10.1016/j.ecoenv.2019.109413 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001322.pica (DE-627)ELV047506334 (ELSEVIER)S0147-6513(19)30743-2 DE-627 ger DE-627 rakwb eng 610 VZ 44.63 bkl Charalampous, Nikolina verfasserin aut Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta 2019transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. Dunaliella tertiolecta Elsevier Photosynthetic apparatus Elsevier Algal growth Elsevier Burkholderia thailandensis Elsevier Energy flux Elsevier Rhamnolipids Elsevier Grammatikopoulos, Giorgos oth Kourmentza, Constantina oth Kornaros, Michael oth Dailianis, Stefanos oth Enthalten in Elsevier Fetters, Lisa ELSEVIER Erysipelas, the “Other” Cellulitis: A Practical Guide for Nurse Practitioners 2021 EES : official journal of the International Society of Ecotoxicology and Environmental safety Amsterdam (DE-627)ELV006765629 volume:182 year:2019 day:30 month:10 pages:0 https://doi.org/10.1016/j.ecoenv.2019.109413 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.63 Krankenpflege VZ AR 182 2019 30 1030 0 |
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Effects of Burkholderia thailandensis rhamnolipids on the unicellular algae Dunaliella tertiolecta |
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The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. |
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The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. |
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The effects of rhamnolipids (RLs) produced and further purified from Burkholderia thailandensis, on the unicellular microalgae Dunaliella tertiolecta were investigated, in terms of RLs ability to affect algal growth, photosynthetic apparatus structure and energy flux, round and through photosystems II and I. Specifically, 24–48 h RLs-treated algae (RLs at concentrations ranged from 5 to 50 mg L−1) showed significantly decreased levels of growth rate, while increased levels of Chl a and b were obtained only in 72–96 h RLs-treated algae. Similarly, although no changes were obtained in the Chl a/b ratio and almost all chlorophyll fluorescence parameters over time, yields of electron transport (ϕR0, ϕE0) and respective performance index (PItotal) were negatively affected at 72 and 96 h. Based on those findings, it seems that the inhibitory effect of RLs on the algae growth rate after 24 and 48 h and the gradual attenuation of the phenomenon (after 72 h of exposure), may indicate the initial response of the organism, as well as algae ability to overcome, since RLs showed no effects on algae photosynthetic ability. Those findings reveal for the first time that RLs from Burkholderia thailandensis are not harmful for Dunaliella tertiolecta. However, further studies with the use of more aquatic species could be essential for assessing the RLs-mediated effects on aquatic biota. |
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