| 盐胁迫对红豆草幼苗生长和离子积累及分配的影响 |
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| 引用本文： | 伍国强,贾姝,刘海龙,王春梅,李善家.盐胁迫对红豆草幼苗生长和离子积累及分配的影响[J].草业科学,2017,34(8). |
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| 作者姓名： | 伍国强 贾姝 刘海龙 王春梅 李善家 |
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| 作者单位： | 兰州理工大学生命科学与工程学院,甘肃 兰州,730050;中国农业科学院兰州畜牧与兽药研究所,甘肃 兰州,730050 |
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| 基金项目： | 国家自然科学基金项目，兰州市人才创新创业专项，兰州理工大学"红柳杰出人才"培养计划项目 |
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| 摘 要： | 以3周龄红豆草(Onobrychis viciaefolia)幼苗为材料,研究了不同浓度(0、5、25、50、100和200mmol·L~(-1))NaCl及50mmol·L~(-1)处理不同时间(0、1、3、5、7和9d)对其生长和离子积累及分配的影响,以期解析红豆草响应盐胁迫的生理机制。结果表明,与对照(0mmol·L~(-1))相比,5、25和50 mmol·L~(-1) NaCl对红豆草幼苗生长影响不大;而100和200mmol·L~(-1)明显抑制其生长。随着盐浓度增加,红豆草地上部和根Na+浓度呈显著增加趋势(P0.05),其中50~200mmol·L~(-1)下,地上部Na+浓度较对照增加14~39倍。特别是200mmol·L~(-1)使根Na+净吸收速率较对照增加了35倍,使整株总Na+量和地上部Na+相对分配比例分别增加了93%和45%;而显著降低了根的K+、Na+选择性运输能力。在50mmol·L~(-1) NaCl下,随着处理时间延长,地上部和根Na+浓度也呈逐渐增加趋势,但根中的Na+到7d时达到最大,然后呈下降趋势;相反,K+浓度均呈缓慢下降趋势,且根中的浓度始终高于地上部。由此可见,在5~50mmol·L~(-1) NaCl下,红豆草通过维持其体内K+、Na+稳态平衡抵御盐胁迫;而在100和200 mmol·L~(-1)下,红豆草地上部积累大量Na+,但其叶片Na+区域化及K+选择性转运能力较弱,导致植株体内Na+、K+稳态紊乱,产生离子毒害,从而抑制其生长。
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| 关 键 词： | 红豆草 盐胁迫 离子选择性吸收 Na+/K+ |
Effect of salt stress on growth,ion accumulation,and distribution in sainfoins seedlings |
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| Wu Guo-qiang,Jia Shu,Liu Hai-long,Wang Chun-mei,Li Shan-jia.Effect of salt stress on growth,ion accumulation,and distribution in sainfoins seedlings[J].Pratacultural Science,2017,34(8). |
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| Authors: | Wu Guo-qiang Jia Shu Liu Hai-long Wang Chun-mei Li Shan-jia |
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| Abstract: | In this study,we investigated the effects of different concentrations of NaCl(0,5,25,50,100 and 200 mmol·L-1)over different time periods(0,1,3,5,7 and 9 d),after 50 mmol·L-1 NaCl treatment,on growth,ion accumulation,and distribution in 3-week-old sainfoin(Onobrychis viciifolia)seedlings.Results showed that concentrations of 5,25,and 50 mmol·L-1 did not significantly affect plant growth,while concentrations of 100 and 200 mmol·L-1 significantly inhibited growth when compared with that in the control(0 mmol·L-1)(P<0.05).With the increase of NaCl concentrations,Na+ concentrations in both shoot and root tended to increase.Compared with the control,the addition of 50~200 mmol·L-1 NaCl increased shoot Na+ concentration by 14~39 times,respectively.In particular,concentrations of 200 mmol·L-1 significantly increased root Na+ net uptake rates,total Na+ amount,and relative shoot Na+ distribution by 35-fold,93% and 45%,respectively;whereas it reduced selective transport capacity for K+ over Na+ from roots to shoots.At 50 mmol·L-1 NaCl,with increased treatment time,Na+ accumulation in both shoot and root tended to increase,but that in the roots reached a peak on the 7th day and reduced subsequently.In contrast,K+ concentrations showed a decreasing trend,to a larger degree in root than in shoot.These results indicate that under NaCl concentrations of 5~50 mmol·L-1,sainfoin plants could adapt to salt stress by maintaining K+ and Na+ homeostasis;while under 100 and 200 mmol·L-1,plants passively accumulated a large amount of Na+ in shoots,where ions compartmentation and selective transport capacity for K+ over Na+ were weak,thus disrupting the balance of Na+ and K+ and resulting in osmotic stress and growth inhibition. |
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| Keywords: | Onobrychis viciaefolia salt stress ion selective uptake Na+/K+ |
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