Photosynthesis and yield in cotton (Gossypium hirsutum L.) Var. Vikram after exclusion of ambient solar UV-B/A |
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Authors: | Priti Dehariya Sunita Kataria K N Guruprasad and G P Pandey |
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Institution: | (1) School of Life Sciences, Devi Ahilya University, Khandwa Road, Indore, 452 001, India |
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Abstract: | The impact of ambient solar UV was studied on the photosynthesis and yield of cotton (Gossypium hirsutum) var. Vikram in a field experiment by excluding either UV-B (<315 nm) or UV-B/A (<400 nm) components of solar spectrum. Cotton
plants were grown in cages covered with polyester filters that could specifically cut off UV-B or UV-B/A part of the solar
spectrum. The control plants were grown under a filter transmissible to UV. Exclusion of UV enhanced plant height, leaf area,
total biomass, and the yield parameters (number and weight of bolls, length of fiber and number of seeds) of cotton. Enhancement
in the vegetative growth and yield of the plants could be related to enhanced rate of photosynthesis in the leaves. Polyphasic
chlorophyll a fluorescence (OJIP) transients from UV excluded plants gave a higher fluorescence yield at I–P phase. Fluorescence
measurements indicated enhanced F
v/F
m ratio and reduction capacity after exclusion of solar UV. Exclusion also enhanced stomatal conductance and intercellular
CO2 concentration and reduced the stomatal resistance. Total soluble proteins were higher after UV exclusion, and in SDS–PAGE
analysis, bands corresponding to smaller subunits (14 kDa) of Rubisco were more intensely stained. Experiments indicated suppressive
action of ambient UV on carbon fixation and yield of cotton plants. Exclusion of solar UV proved to be beneficial in enhancing
the yield of cotton plants. |
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