Photosynthetic gas exchange, chlorophyll fluorescence, antioxidant enzymes, and growth responses of Jatropha curcas during soil flooding

Authors : Krishan Kumar VERMA, Munna SINGH, Ramwant Kumar GUPTA, Chhedi Lal VERMA

Pages : 130-140

Doi:10.3906/bot-1212-32

View : 18 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :The response of chlorophyll fluorescence, photosynthetic CO2 assimilation insert ignore into journalissuearticles values(PN);, stomatal conductance insert ignore into journalissuearticles values(gs);, electrolyte leakage, and transpiration insert ignore into journalissuearticles values(E); was observed in Jatropha curcas seedlings subjected to soil flooding. A strong reduction in growth, leaf-area expansion insert ignore into journalissuearticles values(64%);, and stomatal conductance insert ignore into journalissuearticles values(45%); impaired photosynthetic CO2 assimilation insert ignore into journalissuearticles values(66%);, which eventually reduced biomass yield. The ratio between variable-to-initial chlorophyll fluorescence insert ignore into journalissuearticles values(Fv/Fo); and the maximum quantum yield efficiency of the photosystem II insert ignore into journalissuearticles values(Fv/Fm); was used to explore damage associated with the functioning of the photosynthetic apparatus. A strong, non-linear correlation between physiological parameters and soil flooding duration was found. Our study primarily revealed consequences of epigenetics, i.e. stagnant soil flooding, which affected growth, development, and performance of Jatropha curcas significantly. The activities of catalase insert ignore into journalissuearticles values(CAT);, ascorbate peroxidase insert ignore into journalissuearticles values(APx);, glutathione reductase insert ignore into journalissuearticles values(GR);, and glutathione peroxidase insert ignore into journalissuearticles values(GPx); in leaves increased, implying an integrated pathway involving CAT, APx, GR, and GPx for protection against the detrimental effects of reactive oxygen species insert ignore into journalissuearticles values(ROS); during soil flooding.
Keywords : flooding, photosynthesis, physic nut, relief, stress, Biomass