摘要
用叶绿素荧光诱导动力学技术研究了变水条件对冬小麦旗叶叶绿素荧光参数:初始荧光(Fo)、最大荧光(Fm)、光系统Ⅱ(PSⅡ)的原初光能转化效率(Fv/Fm)和潜在活性(Fv/Fo)以及qP和qNP等的影响。结果表明,干旱胁迫使Fo和qNP值增加,Fv、Fm、Fv/Fm、Fv/Fo、qP、ETR值降低,但在拔节期和灌浆期干旱或复水处理下与干旱处理结果相反,这说明干旱可引起PSⅡ反应中心的破坏,而不同生育期的干湿交替环境条件可以增加PSⅡ反应中心开放部分的比例,将更多的光能用于推动光合电子传递,从而提高光合电子传递能力,同时qNP的提高,有助于耗散过剩的激发能,以保护光合机构,缓解环境对光合作用的影响。
Modulated chlorophyll fluorescence induction kinetics was used to investigate the effects of altered water conditions on the photosynthetic functions of flag leaves of different winter wheat varieties. The photasynthetic functions include many chlorophyll fluorescence parameters such as minimal fluorescence（Fo）, maximal fluorescence （Fm） and the ratio of the variable fluorescence to maximal fluorescence Fv/Fm, the potential activities of PS Ⅱ （Fv/Fo）, photochemical quenching （qP） and non-photochemical quenching （qNP）. The results show that Fo and qNP increase, but Fv, Fm, Fv/Fm, Fv/Fo, qP, ETR reduce under the water stress, However, the result is contrary under the altered water conditions. It indicates that PSⅡ reaction center is destroyed by drought stress. When water is supplied at the jointing stage and grain-filling stage, or drought is supplied at two stages but water is supplied at other stages, qP is increased being helpful to enhance the open ratio of PS Ⅱ reaction center and making more photasynthetic energy to be used in the photosynthetic electron transport in order to improve the electron transport capacity. Meanwhile, the increase of non-photochemical quenching coefficient is helpful for the dissipation of excess light energy protecting the photosynthetic tissue and mitigating the stress of environment on photasynthesis.
出处
《中国生态农业学报》
CAS
CSCD
2007年第1期63-66,共4页
Chinese Journal of Eco-Agriculture
基金
中国科学院知识创新工程重要方向性项目(KZCX3-SW-444)
中国科学院水土保持研究所知识创新领域前沿
西北农林科技大学人才基金
研究生创新计划项目(05ych023)资助
关键词
冬小麦
旗叶
变水条件
光合作用
叶绿素荧光
Winter wheat, Flag leaves, Altered water condition, Photosynthetic functions, Chlorophyll fluorescence
