盐胁迫对高羊茅叶片光系统活性的影响  

Effects of Salt-stress on Photosystem Activity in Leaves of Festuca arundinacea

作　　者：姚广[1] 王鑫[1] 高辉远[1,2] 张立涛[1] 部建雯[1] 

机构地区：[1]山东农业大学生命科学学院,山东泰安271018 [2]作物生物学国家重点实验室,山东泰安271018

出　　处：《中国草地学报》2009年第2期46-52,共7页Chinese Journal of Grassland

基　　金：国家自然科学基金项目(No.30571125);高校博士点专项基金项目(No.20050434007)资助

摘　　要：以高羊茅为材料,利用气体交换、叶绿素荧光猝灭以及快速叶绿素荧光诱导动力学曲线分析(O-J-I-P test)等手段,研究了300mmol/L盐胁迫对高羊茅叶片光系统Ⅰ(PSⅠ)和光系统Ⅱ(PSⅡ)光化学活性以及光合作用的影响。结果表明,300mmol/L盐胁迫没有伤害高羊茅叶片的PSⅡ和PSⅠ的活性,其净光合速率的降低是由气孔导度降低引起的,光合速率降低后诱导实际光化学效率(ФPSⅡ)下降,叶黄素循环在保护高羊茅光合机构免受过剩激发能伤害过程中起重要作用,盐胁迫下叶片中渗透调节物质的增加有助于维持细胞膜的稳定性而进一步保护PSⅡ免受盐胁迫。By analysis of gas exchange, chlorophyll fluorescence, chlorophyll a fluorescence transient （O--J --I-P test）in leaves of Festuca arundinacea, the effects of 300mmol · L^-1 salt-stress on photo-chemical activity of photosystem I （PSI ）, photosystem 1] （PS Ⅱ ） and photosynthesis were studied. The results showed that the 300mmol· L^-1 salt-stress did not have an obvious effect on PS Ⅱ and PSI activity in leaves of Festuca arundinacea. The decrease in actual PSⅡ photo-chemical efficiency （ФPS Ⅱ ） was caused by the decrease in photosynthesis which resulted from the decline of stomata conductance. Xanthophyll cycle played an important role in protecting the photosynthetic apparatus against excess excitation energy. The increased osmoregulation substances might be in favor of the protection of PS Ⅱ by maintaining the stability of cell membrane under salt stress.

关 键 词：高羊茅 盐胁迫 光系统Ⅱ 叶绿素荧光 

分 类 号：S688.4[农业科学—观赏园艺] Q945.11[农业科学—园艺学]