干旱对春小麦旗叶叶绿素a荧光动力学特征及产量间关系的影响

Study on the relation between the effects of water stress on the flag leaf chlorophyll a fluorescence induction kinetics and the yields of spring wheat genotypes in late growth season

利用 OS1 - FL调制式叶绿素荧光分析仪及 SPAD- 5 0 1型手持叶绿素计 ,对水分胁迫下不同春小麦品种生育后期旗叶叶绿素 a荧光动力学参数和叶绿素含量的变化进行了研究 ,同时对水分胁迫下各小麦产量进行了测产。结果表明 :水分胁迫下参试的 8个小麦品种的旗叶叶绿素含量下降、光量子产额减少、可变荧光产量 ( Fv值 )下降 ,小麦叶光系统 ( PS )原初光能转换效率 ( Fv/Fm值 )和 PS 潜在活性 ( Fv/Fo值 )均降低 ,但不同品种降幅大小不同 ;对水分胁迫下 8个小麦品种旗叶叶绿素荧光动力学参数与产量间关系进行分析 。

The effects of water stress on chlorophyll content of the flag leaf and the flag leaf chlorophyll a fluorescence induction kinetics of spring wheat genotypes in late growth season were studied by using SPAD 501 portable chlorophyll meter and OS1 FL modulated chlorophyll fluorometer. Meanwhile, the yields of the tested varieties were studied. The result indicated that chlorophyll a fluorescence induction kinetics curves of spring wheat flag leaf were changed obviously during water stess. The decrease of variable fluorescence yield (Fv values), the ratio of the variable to maximal fluorescence (Fv/Fm), the ration of the variable to minimal fluorescence (Fv/Fo) and photochemical quantum Yield under water stress suggested that the primary light energy conversion of PSⅡ, the potential activities of PSⅡand photosynthetic electron transport and the carbon asimilation had been inhibited. Meanwhile, different genotypes have different responses to water stress. The results of the experiment also showed that the relation between the yields of the eight spring wheat genotypes and the photosynthetic indexes above were not significant.\;