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当前位置: 首页 > 文章 > 弱光胁迫对分蘖期超级稻与常规稻叶片光合特性的影响 南京农业大学学报 2019 (1) 111-117
Position: Home > Articles > The effect of weak light stress on leaf photosynthetic characteristics in super hybrid rice and conventional rice at tillering stage Journal of Nanjing Agricultural University 2019 (1) 111-117

弱光胁迫对分蘖期超级稻与常规稻叶片光合特性的影响

作  者：
王成孜;高丽敏;孙玉明;王博;郭世伟
单  位：
南京农业大学江苏省固体有机废弃物资源化研究重点实验室/江苏省有机固体废弃物协同创新中心/教育部资源节约型肥料工程技术研究中心
关键词：
超级杂交稻;常规稻;弱光胁迫;光合速率;叶肉导度
摘  要：
[目的]本文旨在探明超级稻与常规稻的光合特性对弱光胁迫的响应及其机制。[方法]以‘国稻6号’‘Ⅱ优084’(超级杂交稻)和‘扬稻6号’(常规稻)为试验材料,采用室内营养液培养,通过供应低强度(200μmol·m~(-2)·s~(-1))光照模拟弱光胁迫的方法,分析弱光胁迫对分蘖期超级稻及常规稻叶片光合特性的影响。[结果]弱光胁迫导致水稻生物量及叶片光合速率(P_n)显著降低,超级杂交稻的P_n显著高于常规稻;弱光胁迫下水稻叶片的光系统Ⅱ实际光化学效率(ΦPSⅡ)、羧化效率(CE)及叶片叶肉导度均显著降低,且超级稻降幅大于常规稻;弱光导致超级稻及常规稻的1,5-二磷酸核酮糖羧化酶/氧化酶(Rubisco)含量显著降低,且弱光胁迫下超级稻Rubisco活性(CE/Rubisco)显著高于常规稻。[结论]弱光胁迫对叶片光合速率的抑制主要是由于叶片ΦPSⅡ下降及暗反应过程中叶肉导度下降导致羧化效率下降造成的;超级稻弱光胁迫下光合速率高于常规稻主要是由于其具有更高的Rubisco活性及叶肉导度。
译  名：
The effect of weak light stress on leaf photosynthetic characteristics in super hybrid rice and conventional rice at tillering stage
作  者：
WANG Chengzi;GAO Limin;SUN Yuming;WANG Bo;GUO Shiwei;Jiangsu Provincial Key Lab of Solid Organic Waste Utilization/Jiangsu Collaborative Innovation Center of Solid Organic Wastes/Educational Ministry Engineering Center of Resource-saving Fertilizers,Nanjing Agricultural University;
单  位：
WANG Chengzi%GAO Limin%SUN Yuming%WANG Bo%GUO Shiwei%Jiangsu Provincial Key Lab of Solid Organic Waste Utilization/Jiangsu Collaborative Innovation Center of Solid Organic Wastes/Educational Ministry Engineering Center of Resource-saving Fertilizers,Nanjing Agricultural University
关键词：
super hybrid rice;;conventional rice;;weak light stress;;photosynthetic rate;;mesophyll conductance
摘  要：
[Objectives]This paper aims to study the effects of weak light stress on photosynthesis characteristics and the related mechanisms in super hybrid and conventional cultivars. [Methods]A hydroponic experiment in the greenhouse with simulated weak light stress induced by different illumination intensity was conducted in two rice cultivars,including super hybrid rice( 'Guodao 6'and'Liangyou 084') and conventional rice( 'Yangdao 6'),which aims to study the effects of weak light stress on leaf photosynthetic characteristics. [Results]The biomass and leaf photosynthesis rate( P_n) both significantly decreased under weak light stress,while the leaf P_nin super hybrid rice was higher than that in conventional rice. Meawhile,significantly decreased quantum efficiency of PSⅡ( ΦPSⅡ),carboxylation efficiency( CE),and mesophyll conductance( gm) were observed in rice leaves under weak light condition,while more drastic decreases were found in super hybrid rice. Ribulose-1,5-bisphosphate carboxylase/oxygenase( Rubisco) content under weak light condition decreased by 45% and 32% in super hybrid rice and conventional rice,respectively,while Rubsico activity( expressed as the CE per Rubisco content) under weak light condition was higher in super hybrid rice than that in conventional rice. [Conclusions]The inhibited photosynthesis rate under weak light intensity was mainly due to the decreased leaf quantum efficiency of PSⅡ( ΦPSⅡ) and the decreased CE resulted from gm. The different responses of photosynthesis rate to weak light stress in different rice cultivars resulted from the higher Rubisco activity and gmin super hybrid rice.

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