Photosynthetica 2005, 43(3):457-462 | DOI: 10.1007/s11099-005-0073-3
Photosynthetic responses of radish (Raphanus sativus var. longipinnatus) plants to infection by turnip mosaic virus
- 1 Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, P. R. China
- 2 Institute of Bioengineering, Zhejiang University of Sciences, Hangzhou, Xiasha, P. R. China
Plant growth, chlorophyll (Chl) content, photosynthetic gas exchange, ribulose-1,5-bisphosphate carboxylase (RuBPCO) enzyme activity, and Chl fluorescence in radish (Raphanus sativus var. longipinnatus) plants were examined after turnip mosaic virus (TuMV) infection. Plant fresh mass, dry mass, Chl content, net photosynthetic rate (PN), transpiration rate (E), stomatal conductance (gs), and RuBPCO activity were significantly lower in infected plants after 5 weeks of virus infection as compared to healthy plants. The 5-week virus infection did not induce significant differences in intercellular CO2 concentration (Ci, photochemical efficiency of photosystem 2, PS2 (Fv/Fm), excitation capture efficiency of open PS2 reaction centres (Fv'/Fm'), effective quantum efficiency of photosystem 2 (ΔF/Fm'), and photochemical quenching (qP), but non-photochemical quenching (qN) and alternative electron sink (AES) were significantly enhanced. Thus the decreased plant biomass of TuMV-infected plants might be associated with the decreased photosynthetic activity mainly due to reduced RuBPCO activity.
Additional key words: chlorophyll fluorescence; gas exchange; photosystem 2; photochemical activity; ribulose-1,5-bisphosphate carboxylase, oxygenase
Received: December 16, 2004; Accepted: March 7, 2005; Published: September 1, 2005 Show citation
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