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首页> 外文期刊>African Journal of Biotechnology >Photosynthetic induction in leaves of two cucumber genotypes differing in sensitivity to low-light stress
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Photosynthetic induction in leaves of two cucumber genotypes differing in sensitivity to low-light stress

机译：两种黄瓜基因型对弱光胁迫敏感性不同的光合作用诱导

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摘要

Low light is one of the most important stress factors affecting cucumber production in China greenhouse. Two cucumber genotypes (Cucumis sativus?L.), Deltastar with low light-tolerance and Jinyan No. 2 with low light-sensitivity were used to study the response of gas exchange, chlorophyll fluorescence, stomatal opening and ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco) activity to low light during photosynthetic induction. In this experiment, cucumber plants were exposed to 75 to 100 μmol·m-2·s-1?(control light 500 to 550 μmol·m-2·s-1) at 25 or 17°C (dayight) for 20 days. Photosynthetic induction was determined during cultivation after pre-dark 14 to 16 h. The results showed that there were stomatal and non-stomatal limitations (biochemical limitation) during induction of leaf photosynthesis. However, the biochemical limitation played a primary role in the early stage, but the stomatal limitation was predominant in the later stage during the whole photosynthetic induction. The time of net photosynthetic rate (PN), stomatal conductance (gs), actual photosystem II efficiency (ФPSII), linear electron transport rate (J) and non-photochemical quenching (NPQ) to reach maximal levels (steady-state) of cucumber leaves acclimated to low-light displayed longer induction process when compared with that under control light condition. Moreover, Jinyan No. 2, the low light-sensitive genotype, showed a longer start time of photosynthesis (STP), lower PN, ФPSII, degree of stomatal opening and Rubisco activation state, as well as higher NPQ than those of Deltastar.
机译：弱光是影响中国温室黄瓜生产的最重要压力因素之一。研究了两种黄瓜基因型（Cucumis sativus？L。），低耐光性的Deltastar和低感光度的金盐2号，研究了气体交换，叶绿素荧光，气孔开口和核糖-1、5-双磷酸酯的响应。在光合作用诱导过程中，羧化酶/加氧酶（Rubisco）的活性降低。在该实验中，黄瓜植株在25或17°C（白天/夜晚）下暴露于75至100μmol·m-2·s-1？（控制光为500至550μmol·m-2·s-1）。 20天。在黑暗前14到16小时后的培养过程中确定了光合诱导。结果表明，在叶片光合作用诱导过程中存在气孔和非气孔限制（生化限制）。然而，在整个光合作用的诱导过程中，生化限制在早期起主要作用，而气孔限制在后期起主要作用。达到黄瓜最大水平（稳态）的净光合速率（PN），气孔导度（gs），实际光系统II效率（ФPSII），线性电子传递速率（J）和非光化学猝灭（NPQ）的时间与在对照光照条件下相比，适应弱光的叶子显示出更长的诱导过程。此外，光敏基因型低的金盐2号显示的光合作用开始时间更长，PN，ФPSII较低，气孔开放度和Rubisco活化态较低，NPQ较Deltastar高。

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