盐胁迫下磷素对沟叶结缕草生长及Na^+和K^+含量的影响  

Effect of phosphorus on Na^+ and K^+ concentrations and the growth 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：《草业学报》2013年第3期162-168,共7页Acta Prataculturae 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：采用水培法研究了盐胁迫(300 mmol/L NaCl)下不同浓度磷素(0,1,5,20 mmol/L)对沟叶结缕草生物量以及钠钾离子调控方面的影响。结果表明,缺磷和盐胁迫均抑制了沟叶结缕草的生长。在磷和盐的双重胁迫下,并没有表现出叠加效应。在缺磷环境下,缺磷对植物生长的抑制比盐胁迫的影响更大。不管有无盐胁迫,随培养液中磷素浓度增加,沟叶结缕草的生长受到促进,但在20 mmol/L磷浓度处理时植株的生长反而受到一定的抑制。适量磷素促进了沟叶结缕草的根系生长,有提高叶片Na+分泌量,抑制Na+从根系往叶片的运输,减低叶片Na+的积累,提高K+的吸收和选择性运输,增加叶片K+积累的趋势,但相关指标并不显著。同时提高了叶片K+/Na+,促进了植物的生长。The effect of phosphorus （0, 1, 5 and 20 mmol/L） on biomass and ion regulation was investigated using Zoysia rnatrella under salt stress （300 mmol/L NaC1） in hydroponic solution. Both phosphorus deficiency and salinity retardation of plant growth were more severe under P deficiency than under salt stress. With or without salt stress, phosphorous promoted the growth of Z. rnatrella, but too high a P concentration （20 mmol/L） led to growth inhibition. P addition within reasonable amounts promoted root growth and tended to increase leaf Na＋ secretion but inhibit Na＋ transport from root to leaf. It also restricted leaf Na＋ accumulation and increased leaf K＋ accumulation, leading to a decrease in leaf Na＋/K＋. All of these factors together help improve salt tolerance.

关 键 词：沟叶结缕草 磷素 抗盐性 生长 离子调控 

分 类 号：S688.4[农业科学—观赏园艺]