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Plant and Cell Physiology, 2002, Vol. 43, No. 10 1182-1188
© 2002 Oxford University Press

Chill-Induced Inhibition of Photosynthesis: Genotypic Variation within Cucumis sativus

Jing-Quan Yu1,3, Yan-Hong Zhou1, Li-Feng Huang1 and Damian J. Allen2,4

1 Department of Horticulture, Huajiachi Campus of Zhejiang University, Kaixuan Road 268, Hangzhou, P. R. China 310029
2 Photosynthesis Research Unit of USDA/ARS and Department of Plant Biology, University of Illinois, Urbana, IL 61801-3838, U.S.A.

Cucumber is generally a thermophilic species; however, cultivars have been selected for higher yield during winter cultivation in unheated glasshouses in temperate regions. We tested whether photosynthesis in these varieties had greater chilling tolerance. There was no difference in the instantaneous reduction of photosynthesis at low temperature between four winter glasshouse and four summer field cultivars. After 5 d of 10°C and 100 µmol m–2 s–1 photon flux density, the four field cultivars had a sustained depression of photosynthesis after returning to clement conditions. This inhibition was associated with reduced rates of CO2 fixation and photosystem II (PSII) electron transport in the light, but not with sustained PSII photoinhibition. However, photosynthesis in the glasshouse genotypes was nearly identical to the pre-chill rates. Chill impacts on light-adapted chlorophyll fluorescence parameters, such as the quantum yield of PSII electron transport ({phi}PSII), correlated well with overall photosynthesis. This demonstrates the potential for using these fast and non-invasive techniques to screen for chill-tolerant genotypes, with the potential to further improve winter cucumber yield in unheated glasshouses.

3 Corresponding author: E-mail, yu@mail.hz.zj.cn; Fax 0086-57186049815.

4 Present address: BASF Plant Science, Research Triangle Park, NC 27709-3528, U.S.A.


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