水分胁迫下李树叶绿素荧光动力学特性研究

Effects of water stress on chlorophyll fluorescence in leaves of plum(Prunus salicina Lindl.)

    摘要
  • 摘要: 水分胁迫引起李树叶片叶绿素含量(CHL)、相对含水量(LRWC)下降，叶绿素荧光参数Fo升高，Fm、Fv、Fv/Fm、Fv/Fo、Fm/Fo和Fo与Fm曲线之间面积降低，表明水分胁迫影响了光系统Ⅱ光化学效率、潜在活性、捕获激发能的效率、光合电子的传递以及电子受体库的大小，从而导致光合速率下降。3个供试品种中以“索瑞斯”受影响最小，“秋姬”居中，“安哥洛”最大，说明“索瑞斯”抗旱性最强。

     

    Abstract: The effects of water stress on the chlorophyll fluorescence parameters of the plum were studied by using plant efficiency analyser (PEA). The results indicate that chlorophyll fluorescence parameters of leaf are changed obviously under water stress. Fo is increased; Fm, Fv, Fv/Fm, Fv/Fo, Fm/Fo and the area between the curves of Fo and Fm are decreased, suggesting that the primary light energy conversion of PSⅡ，the potential activities of PSⅡ，the potential photosynthetic activities, photosynthetic electron transport, etc. have been inhibited under water stress. The chlorophyll content, relative water content of plum leaves decrease under water stress. And the characteristics against water stress of three plums varieties are discussed.

     

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