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Effects of Potato Virus YNTN Infection on Gas Exchange and Photosystem 2 Function in Leaves of Solanum tuberosum L.
Authors:Zhou  Y.H.  Peng  Y.H.  Lei  J.L.  Zou  L.Y.  Zheng  J.H.  Yu  J.Q.
Affiliation:(1) Horticultural Department, Huajiachi Campus, Zhejiang University, Hangzhou, 310029, P.R, China;(2) Laboratory of Horticultural Plant Growth, Development and Biotechnology, Ministry of Agriculture, Hangzhou, 310029, P.R, China
Abstract:Photosynthetic responses of potato (Solanum tuberosum L. cv. Chunzao) were examined during potato virus Y (PVYNTN) infection. PVYNTN infection significantly reduced net photosynthetic rate and stomatal conductance, but had little influence on intercellular CO2 concentration. As the disease developed, the maximum carboxylation velocity of ribulose-1,5-bisphosphate carboxylase/oxygenase and the maximum electron transport rate contributing to ribulose-1,5-bisphosphate regeneration gradually decreased, followed by substantial reductions in the relative quantum efficiency of photosystem 2 (PS2) electron transport, the efficiency of excitation energy capture by open PS2 reaction centres, and photochemical quenching, but not in sustained photoinhibition. Thus PVYNTN depressed photosynthesis mainly by interfering with the enzymatic processes in the Calvin cycle which resulted in a down-regulation of electron transport.
Keywords:chlorophyll fluorescence  intercellular CO2 concentration  net photosynthetic rate  photochemistry  photosynthetic electron transport  potato  potato virus Y  quantum yield  stomatal conductance
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