Journal Article

Chill-Induced Inhibition of Photosynthesis: Genotypic Variation within <i>Cucumis sativus</i>

Jing-Quan Yu, Yan-Hong Zhou, Li-Feng Huang and Damian J. Allen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 10, pages 1182-1188
Published in print October 2002 | ISSN: 0032-0781
Published online October 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf134
Chill-Induced Inhibition of Photosynthesis: Genotypic Variation within Cucumis sativus

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  • Biochemistry
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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 (ϕPSII), 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.

Keywords: Keywords: Chlorophyll fluorescence — CO2 assimilation — Cold tolerance — Cucumber.; Abbreviations: Asat, light-saturated net CO2 assimilation rate; ϕCO2, the maximum apparent quantum efficiency for CO2 assimilation; FBPase, fructose 1,6-bisphosphatase; Fo, Fm, minimum and maximum Chl fluorescence yield corresponding to open and closed PSII, respectively, after dark pretreatment; Fo′, Fm′ minimum and maximum Chl fluorescence yield corresponding to open and closed PSII, respectively, during illumination, Fv/Fm, the maximal photochemical efficiency of PSII; Fv′/Fm′, the efficiency of excitation energy capture by open PSII reaction centers; PPFD, photosynthetic photon flux density; ϕPSII, the quantum yield of electron transport at PSII, qP, photochemical quenching coefficient; SBPase, sedoheptulose 1,7-bisphosphatase.

Journal Article.  4005 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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