Greenhouse and field cucumber genotypes use different mechanisms to protect against dark chilling

Functional Plant Biology : FPB
Yan-Hong ZhouJing-Quan Yu

Abstract

Diurnal changes in photosynthetic gas exchange and chlorophyll fluorescence were measured after two consecutive night chills to reveal the photosynthetic characteristics and the mechanism of photoprotection in a greenhouse genotype Jinyou No. 3 (GH), and in a field genotype Jinyan No. 4 (OF) of cucumber (Cucumis sativus L.). Both genotypes showed inhibition of CO2 assimilation immediately after the dark chill, with OF exhibiting a greater reduction. Dark chilling had little effect on stomatal limitation (l) and RuBP regeneration (Jmax) but significantly decreased maximum carboxylation velocity of Rubisco (Vcmax). The reduced capacity for CO2 fixation in the Calvin cycle induced a downstream regulation of PSII photochemistry, a mechanism that regulates the photosynthetic electron transport to match the lower demand for ATP and NADPH in the stroma of chloroplasts. The reduced quantum efficiency of PSII photochemistry was mainly due to reductions both in the photochemical quenching coefficient (qP) and in the efficiency of excitation energy capture by open PSII reaction centres (Fv' / Fm') for OF, but only to the latter for GH. Night chills resulted in an enhanced photorespiration proportion in GH and an O2-dependent alternative e...Continue Reading

References

Feb 13, 2001·Trends in Plant Science·D J Allen, D R Ort
Oct 31, 2002·Plant & Cell Physiology·Jing-Quan YuDamian J Allen
Apr 27, 2004·Journal of Experimental Botany·Jing Quan YuSalvador Nogués
Oct 18, 2005·Photosynthesis Research·Barbara Demmig-Adams
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel
May 1, 2002·The New Phytologist·Salvador NoguésMaria Isabel Trillas

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Citations

Oct 21, 2014·Journal of the Science of Food and Agriculture·Raquel San JoséJaime Prohens
Oct 30, 2010·Journal of Experimental Botany·Ana Sofia Soares-CordeiroChristine H Foyer

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