网站地图 | 联系我们 | 管理系统 | 登录邮箱 | 内网办公 | English | 中国科学院    
首页 所况介绍 机构设置 科研成果 研究队伍 合作交流 研究生教育 党群园地 科学传播
 
 
 当前位置:首页 >>> 论文库

Photosynthetic Potential and its Association with Lipid Peroxidation in Response to High Temperature at Different Leaf Ages in Maize

作 者:Xu, ZZ, Zhou, GS, Han, GX, Li, YJ
影响因子: 2.438
刊物名称: Journal of Plant Growth Regulation
出版年份: 2011
卷: 30  期: 1   页码: 41-50

文章摘要 : 

 High temperature generally constrains plant growth and photosynthesis in many regions of the world; however, little is known about how photosynthesis responds to high temperature with regard to different leaf ages. The synchronous changes in gas exchange and chlorophyll fluorescence at three leaf age levels (just fully expanded, mature, and older leaves) of maize (Zea mays L.) were determined at three temperatures (30 degrees C as a control and 36 and 42 degrees C as the higher temperatures). High temperature significantly decreased the net CO2 assimilation rate (A), stomatal conductance (g(s)), maximal efficiency of photosystem II (PSII) photochemistry (F-v/F-m), efficiency of excitation energy capture by open PSII reaction centers (F'(V)/F'(m)), photochemical quenching of variable chlorophyll fluorescence (q (P)), and the electron transport rate (ETR), whereas minimal fluorescence yield (F (0)) and nonphotochemical quenching of variable chlorophyll fluorescence (q(N)) were increased. The youngest fully expanded leaves had higher A, ETR, and q(P) compared with older leaves. Higher temperature with old leaves led to significant malondialdehyde (MDA) accumulation, a proxy for lipid peroxidation damage from active oxygen species (AOS). MDA content was significantly negatively correlated with A, F-v/F-m, F'(V)/F'(m), and q(P). Thus, the results suggest that photosynthetic potentials, including stomatal regulation and PSII activity, may be restricted at high temperature, together with increasing cell peroxidation, which may be closely associated with leaf age.

| 本站导航 | 园区风光| 联系我们 |
版权所有:中国科学院植物研究所 地址:北京市海淀区香山南辛村20号 邮编:100093 电话:010-62590835
网站备案号:京ICP备05002828号       文保网安备案号:1101080078