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' ).
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