作物学报 ›› 2013, Vol. 39 ›› Issue (01): 93-100.doi: 10.3724/SP.J.1006.2013.00093
张子山1,李耕2,高辉远1,*,刘鹏2,杨程1,孟祥龙1
ZHANG Zi-Shan1,LI Geng2,GAO Hui-Yuan1,*,LIU Peng2,YANG Cheng1,MENG Xiang-Long2
摘要:
为了探讨不同衰老型玉米叶片在衰老过程中光化学反应及其对光合能力维持的贡献, 本研究使用持绿玉米品种“齐319”和早衰玉米品种“黄早四”, 在控制的条件下, 用乙烯利诱导离体叶片衰老, 通过快速叶绿素荧光诱导动力学曲线(OJIP曲线)和820 nm光吸收等技术, 研究了衰老过程中叶片叶绿素含量、光合速率、光系统I (PSI)、光系统II (PSII)以及光合电子传递体活性的变化。结果表明, 在衰老过程中, 齐319叶片叶绿素含量和光合速率的下降速度明显慢于黄早四, 是功能型持绿品种。玉米叶片的衰老伴随着OJIP曲线的J、I、K、L点荧光的增加, 以及远红光诱导820 nm光信号落差的下降。与齐319相比, 黄早四叶片的OJIP曲线和820 nm光吸收曲线的变化更剧烈。我们认为, 在衰老过程中PSI和PSII光化学活性的快速下降和光合电子传递功能的衰退是玉米叶片光合能力迅速下降的重要原因之一。在此基础上, 讨论了衰老过程中玉米叶片中与光合作用有关蛋白与光合能力下降的可能关系。
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