Interactive effects of CO2 enrichment and brassinosteroid on CO2 assimilation and photosynthetic electron transport in Cucumis sativus
Interactive effects of CO2 enrichment and brassinosteroid on CO2 assimilation and photosynthetic electron transport in Cucumis sativus
复制标题
CO2富集和油菜素内酯对黄瓜CO2同化和光合电子传递的交互作用
DOI：
10.1016/j.envexpbot.2011.09.002
复制
发表时间：
2012-01-01
影响因子：
5.7
通讯作者：
Yu, Jing-Quan
中科院分区：
文献类型：
--
作者：
Jiang, Yu-Ping;Cheng, Fei;Yu, Jing-Quan
CO2浓度升高和油菜素内酯（BR）对植物的光合作用和生长都有积极的影响。为探讨CO2浓度升高和BR对黄瓜幼苗光合作用和生长的影响，以黄瓜幼苗为材料，研究了CO2浓度升高和BR单独或联合施用对黄瓜幼苗CO2同化、叶绿素荧光猝灭、碳水化合物代谢、光合基因转录和酶活性的影响。CO2浓度升高和BR的施用均增加了地上部生物量和叶面积。CO2同化、可溶性总糖和淀粉含量、光合基因转录本和Benson-Calvin循环相关酶活性，但两种处理组合的效果更显著。CO2浓度升高对PSII的量子效率影响不大，但显著增加了光合碳还原的电子通量[J（e）（PCR）]，降低了光呼吸碳氧化的电子通量[J（e）（PCO）]。相反，BR处理增加了Phi（PSII），并且Phi（PSII）的增加与J（e）（PCR）和J（e）（PCO）的增加有关。此外，CO2升高和BR的组合处理导致PSII电子通量的累加效应。然而，交替电子通量几乎没有改变CO2富集和BR处理后。因此，短期CO2浓度升高并没有引起光合作用的下调，BR和CO2对黄瓜幼苗叶片CO2同化作用的增强具有加性效应。(C)2011 Elsevier B. V.保留所有权利。
CO2 enrichment and brassinosteroids (BR) both have positive impacts on photosynthesis and plant growth. To examine the interactive effect of CO2 enrichment and BR on photosynthesis and plant growth, CO2 assimilation, chlorophyll fluorescence quenching, carbohydrate metabolism, photosynthetic gene transcript and enzyme activity were analyzed in leaves of young plants of cucumber (Cucumis sativus L) in response to a doubling of growth CO2 level, foliar BR application alone or in combination. Both CO2 elevation and application of BR increased shoot biomass, leaf area. CO2 assimilation, total soluble sugar and starch contents, transcript for photosynthetic gene and activity for enzymes involved in Benson-Calvin cycle but a combination of the two treatments resulted in a more significant effect. Although an elevation of CO2 level had little effects on quantum efficiency of PSII (Phi(PSII)), it significantly increased the electron flux for photosynthetic carbon reduction [J(e)(PCR)] but decreased electron flux for photorespiratory carbon oxidation [J(e)(PCO)]. In contrast, BR treatment increased Phi(PSII) and this increase in Phi(PSII) was associated with increased J(e)(PCR) and J(e)(PCO). Furthermore, a combined treatment of CO2 elevation and BR resulted in an additive effect on PSII electron flux. However, alternative electron flux was almost unaltered after CO2 enrichment and BR treatment. Thus, short term CO2 elevation did not induce a down-regulation of photosynthesis and there was an additive effect between BR and CO2 on the enhancement of CO2 assimilation in leaves of young cucumber plants. (C) 2011 Elsevier B.V. All rights reserved.