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盐、碱胁迫下星星草有机酸代谢调节的比较研究
  • 摘要

    为探究植物抗盐、碱生理机制的异同,根据东北地区盐碱化草原土壤可溶性盐分的组成特点,模拟0~240 mmol/L的盐胁迫和碱胁迫条件,对苗龄8周的星星草(Puccinellia tenuiflora) 幼苗进行了胁迫处理,分析了两种胁迫下植株体内外有机酸组分及其含量的变化.结果表明:在盐胁迫和碱胁迫条件下 ,星星草茎叶中所含的有机酸均以苹果酸、草酸、柠檬酸和琥珀酸为主,但有机酸总量和比例显著不同.星星草茎叶中的有机酸总量随着碱胁迫强度的增大而急剧上升,但随着盐胁迫强度的增大而略有下降.在4种有机酸中,碱胁迫对柠檬酸含量的影响差异最大,使其构成了碱胁迫下有机酸积累的主体.对于盐、碱胁迫下星星草根系分泌物的研究表明:只有在碱胁迫条件下,星星草根系才分泌有机酸而且柠檬酸是唯一可检测出的成分.说明体内大量积累和根系分泌以柠檬酸为主的有机酸是抗碱盐植物星星草对碱胁迫的关键生理响应.

  • 作者

    郭立泉  陈建欣  崔景军  韩丹  石德成  GUO Li-quan  CHEN Jian-xin  CUI Jing-jun  HAN Dan  SHI De-cheng 

  • 作者单位

    东北师范大学生命科学学院,吉林,长春,130024;吉林工商学院生物工程分院,吉林,长春,130062/吉林工商学院生物工程分院,吉林,长春,130062/东北师范大学生命科学学院,吉林,长春,130024

  • 刊期

    2009年4期 ISTIC PKU

  • 关键词

    星星草  碱胁迫  盐胁迫  有机酸  Puccinellia tenuiflora  alkali-stress  salt-stress  organic acids 

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