摘要
采用水培法,以不同耐铝品种江西荞麦(耐性)和内蒙荞麦(敏感)为材料,研究磷、铝交替处理下荞麦叶面积、叶绿素含量和叶绿素荧光参数的变化。结果表明,200μmol.L-1铝胁迫下,两品种荞麦的叶面积减小,叶绿素a(Chl a)、总叶绿素(Chl T)含量降低,最大荧光(Fm)和电子传递速率(ETR)下降,内蒙荞麦叶片初始荧光(Fo)显著升高,PSⅡ(PhotosystemⅡ)最大光化学效率(Fv/Fm)降低,江西荞麦Fo和Fv/Fm变化均不显著。磷、铝交替处理下,两品种荞麦的Chl a和Chl T含量较单铝处理组显著升高,Fv/Fm值略上升,Fo值降低,其中内蒙荞麦Fo下降显著,两品种荞麦叶片的Fm和ETR值有不同程度上升。说明磷处理能部分削弱铝毒对光合作用的光抑制和对光合机构的损伤,有利于植株光合作用的进行。
Two different Al genotype of buckwheat named Jiangxi buckwheat（Al-tolerance） and Neimeng buckwheat（Al-sensitive） were selected as material in this paper.The responses of leaf area,chlorophyll content and chlorophyll fluorescence to phosphorus（P） and aluminum（Al） were characterized in comparison between these two Al genotypes.Results indicated that the leaf area,Chl a,Chl T contents,maximum fluorescence（Fm） and electronic transfer rate（ETR） decreased under 200 μmol.L^-1 Al treatment in both two genotypes.The minimal fluorescence（Fo） increased significantly and PSⅡmaximum fluorescence efficiency（Fv / Fm） decreasing in Neimeng buckwheat,but there was no distinct variety of Fo and Fv / Fm in Jiangxi buckwheat.Compared with 200 μmol.L^-1 Al treatment solely,Chl a and Chl T contents increased significantly,value of Fv/Fm increased slightly and Fo decreased in both two buckwheats when treated with P and Al alternatively.Fm and ETR increased at different level of P and Al treatments in Neimeng and Jiangxi buckwheat.All these results suggested that phosphorus could ameliorate the inhibition to arose,prevent damnification to photosynthesis organ caused by Al toxicity and benefit photosynthesis for plants.
出处
《科技通报》
北大核心
2010年第3期380-384,共5页
Bulletin of Science and Technology
基金
国家自然科学基金项目(30800705)
浙江省自然科学基金项目(Y304185
Y307535)
关键词
荞麦
磷
铝胁迫
叶绿素荧光
buckwheat
phosphorus
aluminum stress
chlorophyll fluorescence
