高温胁迫对冬小麦旗叶伤害的叶绿素荧光指标初探Study on the index of chlorophyll fluorescence for the flag leaf of winter wheat suffering from high temperature stress
王佩舒,赵薇,陈景玲,杨喜田,王谦,寇渊博
摘要(Abstract):
利用Mini-PAM叶绿素荧光仪,测定了冬小麦旗叶在不同温度胁迫下不同时间点光合作用PS II的Fv/Fm、Y(II)、q P、q L、ETR、q N、NPQ、Y(NPQ)和Y(NO)等荧光参数,以研究冬小麦旗叶高温胁迫的温度指标。结果表明,1)Y(II)、q P、q L、ETR和Fv/Fm在不同处理时间点时均随温度升高而下降,并呈现Logistic曲线变化趋势;2)Y(II)、q P、q L、ETR和Fv/Fm降低50%时对应的温度T50随处理时间的延长而降低;3)Y(II),q P,q L和ETR的T50均稳定在32℃,冬小麦旗叶在该温度开始热胁迫伤害;q N、NPQ、Y(NPQ)和Y(NO)的转折点均为36℃,该温度下冬小麦PS II开始失活或被破坏;由Fv/Fm和q N、NPQ、Y(NPQ)和Y(NO)看出,40℃时导致冬小麦旗叶热死亡。
关键词(KeyWords): 高温胁迫;冬小麦;旗叶;PS II;叶绿素荧光
基金项目(Foundation): 国家自然科学基金项目(31071321);国家自然科学基金项目(31370621)
作者(Author): 王佩舒,赵薇,陈景玲,杨喜田,王谦,寇渊博
DOI: 10.16445/j.cnki.1000-2340.2016.01.005
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