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油菜素内酯对黄瓜苗期叶片光合机构调节作用的研究 被引量:46

Role of Brassinosteroids in the Regulation of Photosynthetic Apparatus in Cucumber Leaves
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摘要 0·1mg·L-1油菜素内酯(EBR)处理黄瓜叶片后能显著提高净光合速率(Pn),其效应可持续一周。EBR处理对叶片叶绿素含量和气孔限制值(l)无明显影响,但显著提高了表观量子效率(AQY)、羧化效率(CE)、Rubisco最大羧化速率(Vc,max)和RuBP最大再生速率(Jmax)。EBR还通过增加PSⅡ反应中心开放程度(qP)从而提高PSⅡ光合电子传递量子效率(ΦPSⅡ),但不影响天线色素的光能转化效率(Fv’/Fm’)。 Spray with 0. 1 mg · L^-1 24-epibrassinolide (EBR) significantly up-regulated the net photosynthetic rates of cucumber ( Cucumis sativus) seedlings and the effect lasted for 1 week. EBR had no effect on chlorophyll content and stomatal limitation value (l), but significantly increased apparent quantum yield ( AQY), carboxylation efficiency ( CE), the maximum carboxylation rate of Rubisco ( Vc.max ) and the maximum rate of RuBP regeneration (Jmax). EBR treatment also increased the proportion of ‘open' PS Ⅱ reaction centers (qP) , thereby resulting in an increased quantum yield of PSII electron transport ( ΦPSⅡ ) , but had lit- tle effects on the maximal photochemical efficiency of PS Ⅱ ( Fv/Fm ), and efficiency of energy capture by open PS Ⅱ reaction centres (Fv' /Fm' ).
机构地区 浙江大学园艺系
出处 《园艺学报》 CAS CSCD 北大核心 2006年第4期762-766,共5页 Acta Horticulturae Sinica
基金 国家杰出青年科学基金资助项目(30235029) 国家自然科学基金重点项目(39830230) 国家‘863’项目(2001AA247031) 教育部优秀青年教学科研奖励计划基金资助项目 浙江省青年人才培养专项基金项目
关键词 油菜素内酯 黄瓜 光合作用 叶绿素荧光 调节 Brassinosteroid Cucumber Chlorophyll fluorescence Photosynthesis Regulation
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