| NaCl胁迫对苇状羊茅离子吸收与运输及其生长的影响 |
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| 引用本文： | 李品芳,白文波,杨志成.NaCl胁迫对苇状羊茅离子吸收与运输及其生长的影响[J].中国农业科学,2005,38(7):1458-1465. |
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| 作者姓名： | 李品芳 白文波 杨志成 |
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| 作者单位： | 中国农业大学资源与环境学院/教育部植物-土壤相互作用重点实验室,北京,100094 |
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| 基金项目： | 国家自然科学基金资助项目(30170671) |
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| 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+。
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| 关 键 词： | 苇状羊茅 NaCl胁迫 钾钠离子选择性 离子吸收与运输 |
| 收稿时间： | 2004-7-21 |
Effects of NaCl Stress on Ions Absorption and Transportation and Plant Growth of Tall Fescue |
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| LI Pin-fang,BAI Wen-bo,YANG Zhi-cheng.Effects of NaCl Stress on Ions Absorption and Transportation and Plant Growth of Tall Fescue[J].Scientia Agricultura Sinica,2005,38(7):1458-1465. |
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| Authors: | LI Pin-fang BAI Wen-bo YANG Zhi-cheng |
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| 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+. |
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| Keywords: | Tall Fescue NaCl stress The K-Na selectivity Ion absorption and transportation |
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