不同熟性棉花品种叶片衰老特性研究  

Study on the Senescence Characteristic in Leaves of Different Cotton Cultivars

作　　者：李伶俐[1] 房卫平[2] 谢德意[2] 马宗斌[1] 杜远仿[3] 张东林[3] 

机构地区：[1]河南农业大学农学院,郑州450002 [2]河南省农业科学院棉花油料作物研究所,郑州450002 [3]河南省开封县棉花办公室,开封475100

出　　处：《棉花学报》2007年第4期279-285,共7页Cotton Science

基　　金：河南省重大科技攻关(0322010800);河南省科技攻关(0424020023)

摘　　要：研究了大田条件下15个不同熟性棉花品种叶片衰老生理指标的变化趋势。结果表明:扩展期叶片的SOD活性和MDA含量较高,以后又下降,而POD活性较平稳;中期叶片的SOD、POD活性和MDA含量均不断提高,叶绿素含量高,光合速率强;后期叶片的POD活性和MDA含量继续提高,SOD活性出现两种变化趋势:一种是继续升高或保持平稳,叶绿素含量和光合速率衰减慢;一种是显著下降,叶绿素含量和光合速率下降快。品种间生理指标相关分析表明,后期叶片SOD活性与叶绿素含量、光合效率呈显著或极显著正相关(r=0.5408*,0.7189**),与MDA呈极显著负相关(r=-0.8896**);而后期叶片MDA与叶绿素含量、光合效率呈显著或极显著负相关(r=-0.5533*,-0.8481**)。The changing trends of physiological index in senescence leaves were studied using fifteen cotton cultivars under field condition. The results showed that SOD activity and MDA content were higher in leaf expanding stage, and then decreased, but POD activity kept stable. The MDA content and activities of SOD ,POD in mid-stage cotton leaf increased gradually, and the content of chlorophyll and photosynthesis efficiency were higher. The MDA content and activities of POD in cotton leaf of later stage still increased, and SOD activity had different trend, part of the cultivars were increasing or stable and the decrease of chlorophyll content and photosynthesis efficiency in leaf was slower. SOD activity in other cultivars decreased significantly and the decrease of chlorophyll content and photosynthesis efficiency was quicker. The results of correlation analyses showed that the correlations between SOD and chlorophyll content, photosynthesis efficiency were significantly or extremely significant positive （r=0. 5408^＊ , 0. 7189^＊＊ ）, The correlations between SOD and MDA was extremely significant negative （r=-0. 8896^＊＊ ）. The correlations between MDA and chlorophyll content,photosynthesis efficiency were significantly or extremely significant negative （r=-0. 5533^＊ , -0. 8481^＊＊ ）.

关 键 词：叶片衰老 SOD POD MDA 叶绿素 光合速率 

分 类 号：S562[农业科学—作物学]