冬小麦叶绿素荧光参数与品种抗旱性的关系

为了明确不同生态型小麦品种的光合抗旱特征,选取生态型相异的小麦品种在不同供水条件下种植,测定其旗叶的叶绿素荧光动力学参数,对其在干旱胁迫下的光合特性进行比较研究。结果表明,干旱胁迫使小麦Fo增加,Fm、Fv、Fv/Fm和Fv/Fo值均降低,但变化幅度因生态型而异,高水肥品种的荧光参数对干旱胁迫更为敏感,而旱肥型品种则表现出较强的光合稳定特性。干旱胁迫下,叶绿素荧光参数变化与品种抗旱性密切相关。利用不同生态型小麦品种叶绿素荧光对干旱胁迫的反应差异鉴定品种抗旱性是可行的。

Study on the Relationship of Chlorophyll Fluorescence Characters and Drought Resistance of Winter Wheat Varieties under Drought Stress

In order to study the drought characters in photosynthesis of different ecological type wheat varieties, the photosynthesis characteristic of the different ecological type wheat varieties under drought stress was studied by measuring the chlorophyll fluorescence dynamic parameters. The results indicated that Fm,Fv,Fv/Fm and Fv/Fo values decreased gradually, but Fo values increased under drought stress; The variable range depended on the ecological type. The variation of these chlorophyll fluorescence parameters was closely related to drought tolerance of wheat varieties. It was possible to determine the drought resistance in wheat using chlorophyll fluorescence characters.