首页 | 本学科首页   官方微博 | 高级检索  
     检索      

野大麦耐盐适应性反应机制的研究
引用本文:李瑞芬,王雪青,王宏芝,魏建华.野大麦耐盐适应性反应机制的研究[J].中国农业科学,2006,39(12):2459-2466.
作者姓名:李瑞芬  王雪青  王宏芝  魏建华
作者单位:北京市农林科学院/北京农业生物技术研究中心
摘    要:【目的】探讨野大麦的耐盐适应性反应机制。【方法】采用原子吸收和X-ray微区分析等方法分析野大麦Hordeum brevisubulatum (Trin.) Link]在NaCl胁迫下幼苗生长、K+和Na+吸收、运输、分配及外排等生理响应。【结果】在NaCl≤350 mmol•L-1时,茎叶和根系的干重变化不明显,盐浓度的增加对根生长的抑制作用小于茎叶,根Na+含量增加的幅度小于茎叶、茎叶和根中K+含量均下降,但茎叶可维持较高的K+含量;野大麦具有较强的K+-Na+吸收选择性;低盐胁迫时Na+主要贮存于液泡和细胞间质;高盐胁迫时主要通过外排Na+来维持体内离子平衡。【结论】野大麦在NaCl≤350mmol•L-1时生长正常,其耐盐性与根拒绝吸收Na+及茎叶维持高K+含量有关,Na+区域化与外排可能是野大麦主要的耐盐适应性反应机制。

关 键 词:野大麦  NaCl胁迫  耐盐  离子区域化  离子外排
收稿时间:2005-12-05
修稿时间:2005-12-052006-09-08

Adaptive Mechanisms of Salt Tolerance in Hordeum brevisubulatum
LI Rui-fen,WANG Xue-qing,WANG Hong-zhi,WEI Jian-hua.Adaptive Mechanisms of Salt Tolerance in Hordeum brevisubulatum[J].Scientia Agricultura Sinica,2006,39(12):2459-2466.
Authors:LI Rui-fen  WANG Xue-qing  WANG Hong-zhi  WEI Jian-hua
Abstract:The responses for seedling growth, regulation of Na+ and K+ uptake and transport to shoot, ion compartmentation and Na+ efflux in saline conditions were investigated to determine adaptive mechanisms of salt tolerance in H. brevisubulatum. The results showed that, (1) the dry mass of shoot and root had no significant difference in the range of 350mmol.L-1 NaCl stress, and NaCl stress inhibited the growth of shoot more severely than that of root; (2) the increment of Na+ content in root was more than that in shoot, the decrease of K+ content in shoot less than that in root, the ratios of K+ to Na+ in shoot and root were all more than 1.0, the higher K+/Na+ resulted from the higher K+-Na+ selectivity of plasm membrane; (3) X-ray microanalysis indicated Na+ in cytoplasm was compartmented into vacuole while NaCl≥150mmol.L-1; (4) salt gland was the main path for Na+ efflux out of shoot. The conclusions were made: plants grew normally when NaCl concentration was less than 350mmol.L-1, H. brevisubulatum tended to take up less Na+ and maintain higher K+ in the shoot, Na+ secretion via salt glands and Na+ compartmentation in vaculoe were the adaptive key mechanisms of salt tolerance in H. brevisubulatum.
Keywords:Hordeum brevisubulatum  NaCl stress  Salt tolerance  Ion compartmentation  Ion effiux
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《中国农业科学》浏览原始摘要信息
点击此处可从《中国农业科学》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号