水分胁迫对不同抗旱类型冬小麦幼苗叶绿素荧光参数的影响  

Effects of water stress on chlorophyll fluorescence parameters of different drought resistance winter wheat cultivars seedlings

作　　者：杨晓青[1] 张岁岐[2] 梁宗锁[1] 山颖[2] 

机构地区：[1]西北农林科技大学生命科学学院,陕西杨陵712100 [2]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨陵712100

出　　处：《西北植物学报》2004年第5期812-816,共5页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家重点基础发展规划项目 G1999011708 ;国家自然科学基金 30170559 资助

摘　　要：在人工气候室水培条件下,选用3个不同抗旱类型的冬小麦品种,研究了水分胁迫对冬小麦幼苗叶绿素荧光参数的影响.结果表明:水分胁迫下,冬小麦幼苗可变荧光 Fv 、最大荧光 Fm 、可变荧光与最大荧光比 Fv/Fm 、可变荧光与初始荧光比 Fv/Fo 、光化学淬灭系数 qP 均降低;而初始荧光 Fo 与非光化学淬灭系数 qNP 则升高,说明光系统 PS 受到了伤害,使得PS 原初光能转换效率 Fv/Fm 、PS 潜在活性 Fv/Fo 降低;光合电子传递、光合原初反应过程受到抑制,起光保护作用的热耗散提高.但水分胁迫下品种间各参数变化幅度不同.除qNP外,其余各参数均为抗旱性越强降低幅度越小,而qNP则升高幅度越大.说明水分胁迫对冬小麦幼苗叶绿素荧光参数的影响与其抗旱性密切相关.Under the condition of hydroponics culture in climatron, the effects of water stress on chlorophyll fluorescence parameters of winter wheat seedlings of three varieties with different drought-resistance have studied. The results showed that under water stress, winter wheat seedlings variable fluorescence (Fv)、maximum fluorescence (Fm)、the ratio of the variable to maximum fluorescence (Fv/Fm),the ratio of the variable to minimal fluorescence (Fv/Fo) and the photochemical quenching coefficient (qP) decreased, while the minimal fluorescence(Fo) and non-photochemical quenching coefficient(qNP) raised. Analysis indicated that photosystem Ⅱ damaged, and primary light energy conversion of PSⅡ(Fv/Fm),potential activities of PSⅡ(Fv/Fo) decreased; photosynthetic electron transport,photosythetic primary reaction inhibited; heat disseminate which possess photoprotective effect increased. But each parameters varied difference between cultivars under water stress. Except for qNP, other parameters decreased smaller in wheat cultivars with strong ability of drought-resistance, whereas qNP increased greater. This implies that there was a closed relationship between the effects of water stress on chlorophyll fluorescence parameters of winter wheat seedlings and its drought-resistance.

关 键 词：冬小麦 水分胁迫 叶绿素荧光 光系统Ⅱ 抗旱性 

分 类 号：Q945.78[生物学—植物学] S512.1[农业科学—作物学]