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Plant and Cell Physiology Advance Access published online on December 2, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci234
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received November 11, 2005
Accepted November 25, 2005

Regular Paper

Genotypic Variation on Rubisco Expression, Photosynthetic Electron Flow and Antioxidant Metabolism in the Chloroplasts of Chill-Exposed Cucumber Plants

Yan-Hong Zhou 1, Jing-Quan Yu 2 *, Wei-Hua Mao 1, Li-Feng Huang 1, Xing-Shun Song 1, and Salvador Nogués 3

1 Department of Horticulture, Huajiachi Campus, Zhejiang University, Kaixuan Road 268, Hangzhou 310029, P.R. China
2 Department of Horticulture, Huajiachi Campus, Zhejiang University, Kaixuan Road 268, Hangzhou 310029, P.R. China; Key Laboratory of Horticultural Plant Growth, Development and Biotechnology, Agricultural Ministry of China, Kaixuan Road 268, Hangzhou 310029, P.R. China
3 Departament de Biologia Vegetal, Universitat de Barcelona, 645 Diagonal Av, E-08028 Barcelona, Spain

* To whom correspondence should be addressed.
Jing-Quan Yu, E-mail: jqyu{at}zju.edu.cn


  Abstract

Genetic improvement of agronomic crops is necessary to cope with chilling stress. To identify the physiological factors responsible for this genotypic difference in chill-induced inhibition of photosynthesis, leaf CO2 assimilation, the electron flux in the chloroplast and the antioxidant metabolism in isolated chloroplasts were examined in two genotypes of cucumber (Cucumis sativus) plants with distinct chilling tolerance. Cucumber plants were exposed to 100 µmol m-2 s-1 at 9/7°C (day/night) for 10 d and were then returned to optimal conditions for 2 d. Chilling resulted in more significant reductions in rbcL and rbcS transcripts, Rubisco content and initial Rubisco activity, leading to higher electron flux to O2 in the chilling-sensitive genotype than in the chilling-tolerant genotype. Chilling-tolerant genotype showed lower H2O2 contents in the chloroplasts by maintaining higher H2O2-scavenging activity in the chloroplasts than in the chilling-sensitive genotype. H2O2 accumulation in chloroplast was negatively correlated with the initial Rubisco activity and photosynthetic rate.

Keywords: CO2 assimilation; Cucumis sativus; Electron transport flux; Reactive oxygen species; Rubisco; Water-water cycle.
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