The Experts below are selected from a list of 18537 Experts worldwide ranked by ideXlab platform
Jay J Cheng - One of the best experts on this subject based on the ideXlab platform.
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effects of selenite on unicellular green microalga chlorella pyrenoidosa bioaccumulation of selenium enhancement of Photosynthetic Pigments and amino acid production
Journal of Agricultural and Food Chemistry, 2017Co-Authors: Yu Zhong, Jay J ChengAbstract:Microalgae were studied as function bioaccumulators of selenium (Se) for food and feed supplement. To investigate the bioaccumulation of Se and its effects on the unicellular green alga Chlorella pyrenoidosa, the algal growth curve, fluorescence parameters, antioxidant enzyme activity, and fatty acid and amino acid profiles were examined. We found that Se at low concentrations (≤40 mg L-1) positively promoted algal growth and inhibited lipid peroxidation and intracellular reactive oxygen species. The antioxidative effect was associated with an increase in the levels of glutathione peroxidase, catalase, linolenic acid, and Photosynthetic Pigments. Meanwhile, a significant increase in amino acid and organic Se content was also detected in the microalgae. In contrast, we found opposite effects in C. pyrenoidosa exposed to >60 mg L-1 Se. The antioxidation and toxicity appeared to be correlated with the bioaccumulation of excess Se. These results provide a better understanding of the effect of Se on green microalgae, which may help in the development of new technological applications for the production of Se-enriched biomass from microalgae.
Hongxia Jiang - One of the best experts on this subject based on the ideXlab platform.
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analysis of Photosynthetic Pigments and chlorophyll fluorescence characteristics of different strains of porphyra yezoensis
Journal of Applied Phycology, 2012Co-Authors: Tao Zhang, Zonggen Shen, Jianyi Zhu, Yi Shen, Yue Wang, Chunyan Yao, Yunxia Wang, Hongxia JiangAbstract:The levels of Photosynthetic Pigments and chlorophyll fluorescence of Porphyra yezoensis strains selected from high-light environments were investigated. Sutong and Sulian strains originated from the same high-light environment but were selected from different sites on the Yellow Sea coast of Jiangsu Province, China. In January (a low temperature period), the Sulian strain and the WT (a widely cultivated strain) had higher levels of chlorophyll a, phycoerythrin, phycocyanin, and allophycocyanin, and higher actual photochemical efficiency of PSII (ΔF/F m′) than the Sutong strain. This indicated that Sulian and the WT may have better adaptation to low temperature. In March (an optimal temperature period), Sutong had higher levels of Photosynthetic Pigments and higher ΔF/F m′ than the WT and Sulian strains. This suggested that Sutong had higher light use efficiency at optimal temperatures and that most energy absorbed by PSII was used for Photosynthetic electron transport. The differing areas of origin of these strains may have resulted in these differences in temperature adaptation.
Eva Barreno - One of the best experts on this subject based on the ideXlab platform.
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response to ozone in two lettuce varieties on chlorophyll a fluorescence Photosynthetic Pigments and lipid peroxidation
Plant Physiology and Biochemistry, 2004Co-Authors: Angeles Calatayud, Eva BarrenoAbstract:The effect of different O3 concentrations on two lettuce (Lactuca sativa L.) varieties (Valladolid and Morella) was investigated through chlorophyll (Chl) a fluorescence parameters, Photosynthetic Pigments (Chl a, b and total carotenoid), lipid peroxidation and crop yield. Ozone fumigation caused: a decrease in maximum quantum yield of photosystem II (PSII) photochemistry (Fv/Fm) in mature leaves, a reduction in the non-cyclic electron flow (phiPSII) and a lower capacity to reoxidize the QA pool (qP). These reductions were significant in the Valladolid var. but not in the Morella var. A significant decrease in Chl a, b and in the total carotenoids was observed in the Valladolid var. but not in the Morella var. mainly under O3 fumigation conditions. We observed that the NPQ parameter did not increase in parallel to the qP reduction seen in the Valladolid var. O3 fumigation with respect to air charcoal filtered air conditions. This fact could be associated with a lower capacity for dissipation of non-radiative excess energy and it may be closely correlated with significant decreases in Photosynthetic pigment concentration. A decrease in NPQ from air ozone-free to ozone fumigation in the Morella var. can be explained by the need to maintain the photochemical quenching under O3 stress. It may also be associated with a slight increase in Photosynthetic Pigments. The differences between the two varieties may indicate that the Valladolid var. is more susceptible to O3 damage.
Yin Weilun - One of the best experts on this subject based on the ideXlab platform.
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effects of water stress on Photosynthetic Pigments and chlorophyll fluorescence in four turf grasses
Journal of Henan Agricultural Sciences, 2007Co-Authors: Yin WeilunAbstract:Effects of water stress on Photosynthetic Pigments and chlorophyll fluorescence in four turf grasses(Award,Starlet,Accent and Bonsai2000) were studied.The contents of Chla,Chlb and Car of the 4 grasses changed little at the beginning while decreased except for Bonsai2000 at last,which showed that turf grasses tested had a high adaptability to water stress.The chlorophyll fluorescence induction kinetic parameters(Fo,Fm,Fv,and Fv/Fm) changed differently in direction or degree.The correlation analysis indicated the content of Car and chl a deeply influenced the chlorophyll fluorescence.
Chunyan Yao - One of the best experts on this subject based on the ideXlab platform.
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analysis of Photosynthetic Pigments and chlorophyll fluorescence characteristics of different strains of porphyra yezoensis
Journal of Applied Phycology, 2012Co-Authors: Tao Zhang, Zonggen Shen, Jianyi Zhu, Yi Shen, Yue Wang, Chunyan Yao, Yunxia Wang, Hongxia JiangAbstract:The levels of Photosynthetic Pigments and chlorophyll fluorescence of Porphyra yezoensis strains selected from high-light environments were investigated. Sutong and Sulian strains originated from the same high-light environment but were selected from different sites on the Yellow Sea coast of Jiangsu Province, China. In January (a low temperature period), the Sulian strain and the WT (a widely cultivated strain) had higher levels of chlorophyll a, phycoerythrin, phycocyanin, and allophycocyanin, and higher actual photochemical efficiency of PSII (ΔF/F m′) than the Sutong strain. This indicated that Sulian and the WT may have better adaptation to low temperature. In March (an optimal temperature period), Sutong had higher levels of Photosynthetic Pigments and higher ΔF/F m′ than the WT and Sulian strains. This suggested that Sutong had higher light use efficiency at optimal temperatures and that most energy absorbed by PSII was used for Photosynthetic electron transport. The differing areas of origin of these strains may have resulted in these differences in temperature adaptation.