| 盐胁迫对苗期湖南稷子K +、Na +含量与分布的影响 |
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| 引用本文： | 陆安桥,张峰举,王学琴,许兴.盐胁迫对苗期湖南稷子K +、Na +含量与分布的影响[J].浙江农业学报,2021,33(3):396. |
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| 作者姓名： | 陆安桥 张峰举 王学琴 许兴 |
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| 作者单位： | a.宁夏大学 农学院, 宁夏 银川 750021b.宁夏大学 环境工程研究院,宁夏 银川 750021 |
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| 基金项目： | 国家重点研发计划(2016YFC0501307);国家自然科学基金(31660377);宁夏回族自治区重点研发计划(2018BBF23008);宁夏回族自治区自然科学基金(2020AAC03078) |
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| 摘 要： | 以湖南稷子(Echinochloa frumentacea)为材料,设置不同浓度(0、25、50、75、100、125、150、200 mmol·L -1)的NaCl和Na2SO4作为胁迫处理,探讨盐胁迫对湖南稷子苗期K +、Na +吸收与分布特性的影响。结果表明,随着NaCl和Na2SO4浓度的增加,湖南稷子叶片、茎鞘和根系中Na +含量均增加,K +含量均降低,K +/Na +均下降。其中,Na +含量与分布表现为根系>茎鞘>叶片,叶片和茎鞘Na +含量显著低于根系,K +/Na +明显高于根系;K +含量与分布总体表现为低盐浓度时茎鞘>根系>叶片,中、高盐浓度时茎鞘>叶片>根系。盐胁迫下根系向茎鞘的运输选择性系数(ST1K,Na)与茎鞘向叶片的运输选择性系数(ST2K,Na)在盐浓度>25 mmol·L -1时均显著高于对照,且ST1K,Na值大于ST2K,Na值。当盐浓度≥125 mmol·L -1时,Na2SO4胁迫下地上部K +/Na +趋于稳定,茎鞘和根系中的K +含量和ST1K,Na值高于相同浓度的NaCl胁迫,叶片和茎鞘中的Na +含量低于相同浓度的NaCl胁迫。ST2K,Na值在Na2SO4胁迫下呈上升趋势,在NaCl胁迫下先升高后降低。因此,湖南稷子幼苗根系对K +具有较高的选择性吸收能力;高盐浓度下,湖南稷子对Na2SO4具有更强的耐性。
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| 关 键 词： | 盐胁迫 湖南稷子 苗期 K + Na + 运输选择性系数 |
| 收稿时间： | 2020-08-28 |
Effects of NaCl and Na2SO4 stress on content and distribution of K + and Na + of Echinochloa frumentacea seedlings |
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| LU Anqiao,ZHANG Fengju,WANG Xueqin,XU Xing.Effects of NaCl and Na2SO4 stress on content and distribution of K + and Na + of Echinochloa frumentacea seedlings[J].Acta Agriculturae Zhejiangensis,2021,33(3):396. |
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| Authors: | LU Anqiao ZHANG Fengju WANG Xueqin XU Xing |
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| Institution: | a. College of Agronomy, Ningxia University, Ningxia 750021, China
b. Institute of Environment Engineering, Ningxia University, Ningxia 750021, China |
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| Abstract: | In order to explore the characteristic of K + and Na + absorption and distribution at seedling stage of Echinochloa frumentacea under salt stress. The variety Haizi-1 was used as test material, eight different concentrations (0, 25, 50, 75, 100, 125, 150, 200 mmol·L -1) of NaCl and Na2SO4 were set to simulate conditions of salt stress in this study. The results showed that with the increase of NaCl and Na2SO4 concentration, Na + content was increased, K + content was decreased, K +/Na + ratio were all decreased in leaf, stem sheath and root; Content and distribution of Na + was root>stem sheath>leaf, Na + content in leaf and stem sheath were significantly lower than that in root. K +/Na + ratio in leaf and stem sheath was higher than that in root. Content and distribution of K + was stem sheath>root>leaf under low salt concentration, and under the medium and high salt concentration, content and distribution of K + was stem sheath>leaf>root. Transport selectivity coefficient from root to stem sheath of K + and Na + (ST1K, Na) and transport selectivity coefficient from stem sheath to leaf of K + and Na + (ST2K, Na) under salt stress were significantly higher than those of the control at salt concentration>25 mmol·L -1, and ST1K, Na was higher than ST2K, Na. When the salt concentration was≥125 mmol·L -1, K +/Na + ratio became stable in above ground under Na2SO4 stress, K + content in stem sheath and root and ST1K,Na were higher than those under the same concentration of NaCl stress, and Na + content in leaf and stem sheath were lower than that under the same concentration of NaCl stress. ST2K, Na showed an upward trend under Na2SO4 stress, and increased firstly and then decreased under NaCl stress. In conclusion, it had been shown that under salt stress, root system of E. frumentacea had a strong restriction on sodium ion transport to the above-ground part and had higher selective absorption capacity for K +, and it had more tolerance to Na2SO4 stress than NaCl stress under higher concentration of salt stress. |
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| Keywords: | salt stress Echinochloa frumentacea seedlings stage K + Na + transport selectivity coefficient |
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