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当前位置: 首页 > 文章 > 不同陆地棉品种(系)盛花期叶片光抑制光保护机制 新疆农业科学 2013,50 (7) 1177-1184
Position: Home > Articles > Physiological Mechanism for Photoinhibition and Photoprotection of Leaves at the Bolling Stage in G. hirsutum Xinjiang Agricultural Sciences 2013,50 (7) 1177-1184

不同陆地棉品种(系)盛花期叶片光抑制光保护机制

作  者：
肖璐;魏亦农
单  位：
石河子大学农学院
关键词：
陆地棉;光抑制;防御机制;光化学效率
摘  要：
【目的】研究陆地棉不同品种(系)盛花期光合机构中光抑制和相应的防御保护机制。【方法】系统测定8个陆地棉品种(系)盛花期叶片气体交换参数和叶绿素荧光参数。【结果】鲁抗20和13-1比其余6个品种(系)在盛花期高温下保持相对较高的气孔导度和蒸腾速率,受气孔限制的影响较小;ΦPSII、qP、Fv/Fm都处于较低的水平,说明在高温和强光下,叶片的光合机构受到严重的光抑制,部分PSⅡ反应中心可能受到光破坏;Fv/Fm无明显差异,8个品种(系)光抑制程度相似;13-1和鲁抗20的ΦPSII、qP、NPQ显著高于其余6个品种(系),具有较高的光合电子传递和热耗散能力,形成良好的保护防御机制;华中111、抗1和FB20叶片的PSI实际光合效率较高,光保护较弱,较易受强光损伤;鲁抗20叶片的PSI实际光合效率较低,但光保护最强,抗强光损伤;1-6082叶片PSI实际光合效率最低,与其光保护较弱和光损伤最高有关。【结论】陆地棉盛花期的光合参数表明13-1和1-6082比其余六个品种(系)在盛花期高温下保持相对较高的气孔导度和蒸腾速率,说明其受气孔限制的影响较小,因而13-1和1-6082的P n也显著高于冀棉158,FB20,华中111。说明13-1和1-6082两个品种(系)对高温表现出较强的适应能力。荧光参数分析发现叶片的光合机构受到严重的光抑制,且八个品种光抑制程度相似,其叶片的光保护机制主要通过光合机构的电子流能量耗散途径来阻止光合电子传递链的过度还原,减轻光合机构的光抑制。
译  名：
Physiological Mechanism for Photoinhibition and Photoprotection of Leaves at the Bolling Stage in G. hirsutum
作  者：
XIAO Lu;WEI Yi-Nong;College of Agronomy,Shihezi University;
关键词：
upland cotton;;light restraint;;self-defending mechanism;;photochemistry efficiency
摘  要：
【Objective】Study the physiological mechanism for photoinhibition and photo protection of leaves at the bolling stage in G. hirsutum. 【Method】The gas exchange parameters,chlorophyll fluorescence parameters of 8 G. hirsutum leaves were measured. 【Result】Lukang 20 and 13-1 have higher stomatal conductance and transpiration rate than the rest six varieties(lines),whose effect by stomatal limiting is small; The ΦPSII and qP,Fv/Fm are both at a low level,showing that the photosynthetic mechanism by severe photoinhibition,part of the PS II reaction center is likely to be damaged by the light; Fv/Fm shows no significant difference so eight varieties(lines) have similar degree of light inhibition; The ΦPSII,qP,and NPQ of 13-1,Lukang20 are higher than those of the remaining six varieties(lines),which have higher photosynthetic electron transport and heat dissipation capacity to form good protective mechanism; The PSI [Y(I) ]of ‘Huazhong111',‘Kang1'and ‘FB20'leaves are higher and the protection is weaker and more vulnerable by light damage; The PSI [Y(I) ]of 'Lukang20' is low but it has stronger photo protection to resist injury; The PSI [Y(I) ] of 1-6082 is the lowest,which is relevant to the weak photo protection and the maximum photo damage.【Conclusion】photosynthetic parameters showed that 13-1 and 1-6082 to maintain higher stomatal and transpiration rate,state that stomatal limitation is lesser,thus 13-1 and 1-6082 the Pn was also significantly higher than jimian158,FB20,huazhong111. State that 13-1 and 1-6082 have stronger ability to adapt to high temperature. Fluorescence parameter analysis found that leaf photosynthetic mechanism by serious photoinhibition,and eight varieties have similar hight inhibition degree,the protection mechanism mainly by energy dissipation of photosynthetic electron flow to prevent the excessive reduction of photosynthetic electron transport chain,reduce the photoinhibition of photosynthesis mechanism.

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