NaCl胁迫下不同磷浓度对沟叶结缕草生长及光合特性的影响  

Effects of Different Phosphorus Concentrations on the Growth and Photosynthesis of Zoysia matrella under Salt Stress

作　　者：蒋乔峰[1] 陈静波[1] 宗俊勤[1] 李珊[1] 褚晓晴[1] 郭海林[1] 刘建秀[1] 

机构地区：[1]江苏省中国科学院植物研究所南京中山植物园,江苏南京210014

出　　处：《草地学报》2013年第3期526-533,共8页Acta Agrestia Sinica

基　　金：国家科技支撑计划项目(2011BAD13B09)(2012BAB03B04);江苏省农业科技支撑项目(BE2010309)资助

摘　　要：采用水培法研究了NaCl胁迫下(300mmol.L-1)不同浓度磷素(0,1,5和20mmol.L-1)对沟叶结缕草(Zoysia matrella)生物量及光合作用的影响。结果表明:NaCl胁迫显著抑制了沟叶结缕草的生长。随培养液中磷浓度增加,沟叶结缕草的枝叶干重和根系均受到促进,但在20mmol.L-1磷浓度处理时植株的生长反而受到一定的抑制。NaCl胁迫下,沟叶结缕草的叶绿素和类胡萝卜素含量有所增加,但是磷处理对色素的影响很小。盐处理降低了植株的净光合速率、气孔导度、胞间CO2浓度和蒸腾速率,施加磷能在一定程度上缓解盐胁迫的效应。尽管随着磷素增加,盐敏感指数(SI)下降,但适量磷浓度促进了沟叶结缕草的绝对生长,提高了叶片的光合速率,从而提高其抗盐性。Effects of phosphorus（0,1,5 and 20 mmol·L^-1） on the biomass and photosynthesis of Zoysia matrella were investigated under salt stress（300 mmol·L^-1 NaCl） using hydroponic method.Results showed that NaCl stress decreased plant growth.Shoot dry weight and root dry weight of Zoysia matrella were promoted with increasing P concentration,and they were inhibited when P concentration was 20 mmol·L^-1.Chlorophyll and carotenoid contents were increased under salt stress,but they were not significantly affected by increasing P concentration.Salt stress decreased net photosynthesis rate,stomatal conductance,intercellular CO2 concentration and transpiration rate,which was relieved with increasing P concentration.Although salt sensitive index was decreased with increasing P concentration,the reasonable amount of P can improve the salt resistance of Zoysia matrella by promoting the photosynthetic rate and growth of plant.

关 键 词：沟叶结缕草 磷 NACL胁迫 生长 光合特性 

分 类 号：Q945.11[生物学—植物学] Q945.78