不同特性水稻品种灌浆期叶绿素含量及荧光特性的比较

目的]比较分析辽宁省不同特性水稻(Oryza sativa L.)品种灌浆期叶绿素含量及荧光特性,为筛选及选育高光能利用率和耐光抑制的优良水稻品种提供科学依据。方法]以辽粳9、辽优1106、东壮2号3个辽宁省水稻品种为材料,利用便携式叶绿素仪和调制荧光仪MINI-PAM测定自然条件下灌浆结实期叶绿素含量及荧光参数Ft、Fm'、Yield、ETR、qP的变化情况。结果]在叶绿素含量上,辽粳9、东壮2号整个灌浆期始终保持较高的水平,但辽优1106灌浆中后期迅速下降。叶绿素荧光参数值总体上辽粳9、东壮2号灌浆各时期变化平缓,且趋于一致,辽粳9均略高于东壮2号;而辽优1106荧光参数中除Fm'和qP与上述2个品种变化趋势相同外,其他参数均表现出灌浆中后期急剧下降。结论]杂交稻辽优1106和东壮2号中后期的光适应能力较弱,光能利用率急速下降;辽粳9对整个灌浆期的光适应能力及光合利用率最高。

Comparison of Chlorophyll Content and Fluorescence Characteristics of Different Rice ( Oryza sativa L.) Varieties at Grain-filling Stage

Objective] The purpose was to comparatively analyze chlorophyll content and fluorescence characteristics of different rice varieties at grain-filling stage,and provide a scientific basis for screening and breeding good rice varieties with high light use efficiency and resistance to photo-inhibition in Liaoning Province.Method] Three rice varieties from Liaoning Province,Liaojing 9,Liaoyou 1106 and Dongzhuang No.2,were used to study the change situation of chlorophyll content and chlorophyll fluorescence parameters Ft,Fm′,Yield,ETR,qP at grain-filling stage under natural state using portable chlorophyll apparatus and pulse-amplitude modulation fluorometer MINI-PAM.Result] The chlorophyll content of Liaojing 9 and Dongzhuang No.2 kept a high level at whole grain-filling stage,while Liaoyou1106 reduced quickly at the later grain-filling stage.Chlorophyll fluorescence parameters of Liaojing 9 and Dongzhuang No.2 varied slowly and showed a consistent change law at every stage of grain filling,and that of Liaojing 9 was higher than Dongzhuang No.2.While except Fm′ and qP of Liaoyou 1106 had a consistent change law with Liaojing 9 and Dongzhuang No.2,its other chlorophyll fluorescence parameters reduced quickly at the middle and later grain-filling stage.Conclusion] Hybridize rice Liaoyou 1106 and Dongzhuang No.9 had a adaptability to lower light and light use efficiency reduced quickly at middle and later grain-filling stage;While Liaojing 9 had the highest adaptability to light and light use efficiency.