Photosynthetic responses of radish (Raphanus sativus var. longipinnatus) plants to infection by turnip mosaic virus
Guo, Y.P.(Zhejiang Univ., Hangzhou (China). Dept. of Horticulture) | Guo, D.P.(Zhejiang Univ., Hangzhou (China). Dept. of Horticulture)E-mail:[email protected] | Peng, Y.(Zhejiang Univ., Hangzhou (China). Dept. of Horticulture) | Chen, J.S.(Zhejiang Univ. of Sciences, Hangzhou (China). Inst. of Bioengineering)
Plant growth, chlorophyll (Chl) content, photosynthetic gas exchange, ribulose-1,5-biphosphate carboxylase (RuBPCO) activity, and Chl fluorescence in Raphanus sativus var. longipinnatus plants were examined after turnip mosaic virus infection. Plant fresh mass, dry mass, Chl content, net photosynthetic rate, transpiration rate, stomatal conductance, and RuBPCO activity were significantly lower in infected plants after 5 weeks of virus infection than in healthy ones. The 5-week virus infection did not induce significant differences in intercellular CO2 concentration, photochemical efficiency of photosystem 2, PS2 (Fv/Fm), excitation capture efficiency of open PS2 reaction centres, effective quantum efficiency of PS2, and photochemical quenching. Non-photochemical quenching and alternative electron sink were significantly enhanced. Thus, the decreased plant biomass of infected plants might be associated with the decreased photosynthetic activity.
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