盐胁迫对锦带花幼苗生长及不同部位Na^+、K^+、Ca^(2+)、Mg^(2+)离子质量分数的影响  

Effect of Salt Stress on Growth and Ion Contents in Weigela florida Cuttings

作　　者：任志彬[1] 王志刚[1] 聂庆娟[1] 黄大庄[1] 马向超[1] 

机构地区：[1]河北农业大学,保定071001

出　　处：《东北林业大学学报》2011年第5期24-26,49,共4页Journal of Northeast Forestry University

摘　　要：以锦带花幼苗为材料,采用盆栽法,研究不同土壤盐质量分数对锦带花幼苗生长及不同部位Na+、K+、Ca2+、Mg2+离子质量分数的影响。结果表明:锦带花幼苗在盐质量分数≤0.3%时,盐胁迫对其生物量抑制作用不显著,在盐质量分数为0.1%时还略有增加,当盐质量分数为0.4%时才显著下降;根冠生物量比的变化趋势与生物量相同,锦带花幼苗具有一定的耐盐能力。随着盐胁迫的增加,根部及叶部的钠离子质量分数都逐渐增加,在各盐质量分数下锦带花幼苗的根部钠离子质量分数都明显大于叶部,根部拦截了部分钠离子使叶部的钠离子质量分数降低;盐胁迫还降低了根部吸收钾离子的能力,使根部的钾离子质量分数降低,但却增加了向叶部运输钾离子的能力,从而使叶部的钾离子质量分数增加及钾钠质量分数比升高;盐胁迫增加了锦带花根部的钙离子质量分数及保持叶部钙离子的质量分数与对照相当。锦带花幼苗这种对钾及钙离子选择性吸收及限制钠运输的能力应该是锦带花重要的耐盐机制。An experiment was conducted to study the effect of salt stress on the growth and ion contents of Weigela florida cuttings.Results showed that the inhibition of salt on the biomass of W.florida cuttings was not significant when salt concentration was less than or equal to 0.3%,while the biomass showed little increase at a salt concentration of 0.1%,and the biomass decreased obviously at a salt concentration of 0.4%.The changing trend of ratio of root to crown was the same as that of the biomass.It indicates that W.florida has salt tolerance ability.Na＋ content in roots and leaves increased gradually with increasing salt concentration.Na＋ content in roots was markedly higher than that in leaves because the roots retained more Na＋ and stopped Na＋ entering into the leaves.Salt stress resulted in the decrease in K＋ absorption in roots but the increase in K＋ transportation,so the K＋ content in roots decreased and the K＋ content in leaves increased.Salt stress caused the increase in Ca2＋ content in roots and little change in Ca2＋ content in leaves.The strong ability to inhibit extra Na＋ from entering into the leaves and the selective absorption of K＋ and Ca2＋ could be the key mechanisms of salt-tolerance of W.florida.

关 键 词：盐胁迫 锦带花幼苗 生长 金属离子 

分 类 号：Q945.78[生物学—植物学] Q949.781.2