中国农业科学 ›› 2005, Vol. 38 ›› Issue (07): 1458-1465 .

• 畜牧.兽医.资源昆虫 • 上一篇    下一篇

NaCl胁迫对苇状羊茅离子吸收与运输及其生长的影响

李品芳,白文波,杨志成   

  1. 中国农业大学资环学院
  • 收稿日期:2004-07-21 修回日期:1900-01-01 出版日期:2005-07-10 发布日期:2005-07-10
  • 通讯作者: 李品芳

Effects of NaCl Stress on Ions Absorption and Transportation and Plant Growth of Tall Fescue

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  1. 中国农业大学资环学院
  • Received:2004-07-21 Revised:1900-01-01 Online:2005-07-10 Published:2005-07-10

摘要: 通过室内水培试验,探讨了NaCl胁迫对苇状羊茅离子吸收与运输及生长的影响及其随时间的变化。结果表明,NaCl胁迫浓度的增加使苇状羊茅茎叶和根系的K+含量、K+/ Na+、Ca2+/Na+、干物质重下降,而使Na+、Cl-含量、Cl-/Na+ 及对K+/Na+的吸收与运输选择性增高。茎叶Na+含量和Cl-含量增大的幅度大于根系,且Cl-大于Na+,茎叶中Cl-/Na+基本保持在1.6左右,而根系在0.8左右。胁迫时间对植株K+ 、Na+含量的影响最为显著。K+-Na+吸收选择性主要受环境盐分浓度的影响,而其运输选择性却主要受胁迫时间的影响。盐分对苇状羊茅地上部生长的抑制作用大于根系,且Cl-的影响程度大于Na+。

关键词: 苇状羊茅, NaCl胁迫, 钾钠离子选择性, 离子吸收与运输

Abstract: The absorption and transportation of inorganic ions and growth of Tall Fescue were studied in a hydroponics experiment. The results showed that, (1) NaCl stress reduced the number of K+ contents, K+/ Na+ and Ca2+/ Na+ ratios in shoots and roots, and dry weights of Tall Fescue, but increased Na+ and Cl- contents, and enhanced the selectivity of Cl--Na+ and K+-Na+; (2) The increments of Na+ and Cl- contents in shoot were higher than those in roots, the increment of Cl- contents were more than that of Na+ contents, and the Cl-/ Na+ ratios were almost 1.6 in shoots and about 0.8 in roots; (3) NaCl stress time affected the K+ and Na+ contents significantly and reduced the transportation selectivity ratios of K+ and Na+, but NaCl concentration mainly influenced the absorption ratios of K+ and Na+; (4) NaCl stress inhibited the growth of shoots more severely than that of roots, and the stress effect of Cl- was more significant than that of Na+.

Key words: Tall Fescue, NaCl stress, The K-Na selectivity, Ion absorption and transportation