| K+对盐胁迫下罗布麻生长及离子吸收分配的效应 |
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| 引用本文： | 夏曾润, 王沛东, 贾文, 未丽, 米莉, 王锁民. K+对盐胁迫下罗布麻生长及离子吸收分配的效应[J]. 草业科学, 2014, 8(11): 2088-2094. DOI: 10.11829/j.issn.1001-0629.2014-0402 |
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| 作者姓名： | 夏曾润 王沛东 贾文 未丽 米莉 王锁民 |
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| 作者单位： | 1.兰州大学草地农业科技学院 草地农业生态系统国家重点实验室,甘肃 兰州 730020 |
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| 摘 要： | 通过温室盆栽试验,研究了低钾(0.01 mmolL-1)和正常钾(2.5 mmolL-1)水平对NaCl胁迫下罗布麻(Apocynum venetum)生长和离子吸收分配的影响。结果表明,随着介质中NaCl浓度的增加,罗布麻的根、茎、叶的生物量和株高呈下降趋势;但相同浓度NaCl处理下,低钾和正常钾之间无显著差异(P0.05)。罗布麻各器官中Na+含量随介质NaCl浓度的增加显著上升(P0.05),叶中上升幅度明显大于根和茎;叶和茎中K+随介质NaCl浓度的增加显著下降,但仍维持较高水平,根中K+浓度能保持稳定;低钾和正常钾水平下,与无盐胁迫(对照)相比,50 mmolL-1 NaCl处理植株叶中K+浓度无显著变化。在对照条件下,罗布麻体内积累大量K+,其叶中K+浓度是Na+的15倍多。可见,增强K+的选择性吸收和运输,保持叶部较高的K+含量和K+/Na+比是罗布麻适应盐逆境的重要生理机制。
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| 关 键 词： | 罗布麻 K+水平 盐胁迫 离子吸收和分配 K+/Na+比 |
| 收稿时间： | 2014-09-04 |
Effect of K+ on the growth,ion absorption and distribution of Apocynum venetum under salt stress |
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| Zeng-run XIA, Pei-dong WANG, Wen JIA, Li WEI, Li MI, Suo-min WANG. Effect of K+ on the growth, ion absorption and distribution of Apocynum venetum under salt stress[J]. Pratacultural Science, 2014, 8(11): 2088-2094. DOI: 10.11829/j.issn.1001-0629.2014-0402 |
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| Authors: | Zeng-run XIA Pei-dong WANG Wen JIA Li WEI Li MI Suo-min WANG |
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| Abstract: | The effects of two K+ levels(0.01 and 2.5 mmolL-1)on the growth,ion absorption and distribution of Apocynum venetum under NaCl stress were investigated by the pot experiment. The results indicated that the biomass and plant height of A. venetum decreased with the increase of external NaCl concentration, however, there was no significant difference between 0.01 and 2.5 mmolL-1 K+ under the same salt treatment(P0.05). Na+ contents in all tissues of A. venetum increased significantly (P0.05) with the increase of external NaCl concentration and the increase rate in leaf was greater than that in root and stem. In contrast to Na+,K+ contents decreased significantly but still maintained at a high level in leaf and stem and maintained stable in root with the increase of external NaCl concentration. Furthermore, compared with the control, K+ contents in leaf did not significantly change when A. venetum was exposed to 50 mmolL-1 NaCl. Moreover,A. venetum accumulated high contents of K+ in the absence of salt stress, especially in leaf where K+ contents were 15 times higher than that of Na+. In conclusion, enhancing the capacity of selective absorption and transport for K+, and hence maintaining high K+ contents and K+/Na+ ratio in leaf are the key adaptive mechanisms of salt-tolerance in A. venetum. |
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| Keywords: | Apocynum venetum K+ levels salt stress ion absorption and distribution K+/Na+ ratio |
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