草业科学2017，Vol.34Issue(8)：1661-1668,8.DOI:10.11829/j.issn.1001-0629.2016-0447
盐胁迫对红豆草幼苗生长和离子积累及分配的影响
Effect of salt stress on growth, ion accumulation, and distribution in sainfoins seedlings
摘要
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.关键词
红豆草/盐胁迫/离子选择性吸收/Na+/K+Key words
Onobrychis viciaefolia/salt stress/ion selective uptake/Na+/K+分类
农业科技引用本文复制引用
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):1661-1668,8.基金项目
国家自然科学基金项目(31460101、31260294) （31460101、31260294）
兰州市人才创新创业专项(2014-2-6) （2014-2-6）
兰州理工大学"红柳杰出人才"培养计划项目(J201404) （J201404）
