Chill-induced inhibition of photosynthesis: genotypic variation within Cucumis sativus.
Chill-induced inhibition of photosynthesis: genotypic variation within Cucumis sativus.
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DOI：
10.1093/pcp/pcf134
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发表时间：
2002-10
影响因子：
4.9
通讯作者：
Jingquan Yu;Yanhong Zhou;Li-feng Huang;D. Allen
中科院分区：
文献类型：
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作者：
Jingquan Yu;Yanhong Zhou;Li-feng Huang;D. Allen
黄瓜通常是嗜热品种；然而，在温带地区不加热的温室里冬季栽培时，黄瓜品种被选为产量较高的品种。我们测试了这些品种的光合作用是否具有更强的耐冷性。4个冬棚品种与4个夏田品种在低温下的光合作用瞬时减少量差异不显著。在10℃和100微摩尔m(-2)S(-1)光子通量密度作用5d后，4个大田品种在恢复温和条件后，光合作用持续受到抑制。这种抑制与光中CO(2)固定速率和光系统II(PSII)电子传递的降低有关，但与持续的PSII光抑制无关。然而，温室不同基因型的光合作用与低温前的光合作用几乎相同。低温对光适应的叶绿素荧光参数的影响，如PSII电子传递的量子效率(Phi(PSII))，与总体光合作用有很好的相关性。这证明了使用这些快速和非侵入性技术来筛选耐寒基因的潜力，并有可能进一步提高不加热温室的冬季黄瓜产量。
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 degrees C and 100 micro mol 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 CO(2) 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.