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温室盆栽条件下,研究了100~400 mmol/L NaCl胁迫对2年生库拉索芦荟的生长及体内离子分布的影响。结果表明,100 mmol/L NaCl处理下芦荟植株干重和叶片叶绿素含量与对照差异不显著,200和400 mmol/L NaCl处理下干重和叶绿素含量显著下降;芦荟根系活力在200 mmol/L NaCl处理下达到最大值,增加盐浓度,根系活力下降;盐胁迫处理的叶片电解质渗漏率显著高于对照,随着胁迫强度的增加而增加。盐胁迫下,芦荟体内Na+和Cl-含量随着盐浓度的增加而增加,K+和Ca2+表现出相反的变化趋势。Na+主要积累在茎部,叶片和根系含量较小;Cl-主要积累在叶片,茎部含量相对高于根系。盐胁迫下芦荟体内K+和Ca2+含量明显低于对照,随着盐浓度增加,叶片K+含量明显增加,Ca2+则相反。芦荟叶片保持相对较低的Na+/K+比率和较强的K+和Ca2+向上选择性运输能力,是芦荟具有一定耐盐性的重要原因。
The effects of 100 ~ 400 mmol / L NaCl stress on the growth and ion distribution of 2-year-old Aloe vera were studied under greenhouse conditions. The results showed that the dry weight and leaf chlorophyll content of aloe plants under 100 mmol / L NaCl treatment were not significantly different from those of the control. The dry weight and chlorophyll content of aloe under 200 and 400 mmol / L NaCl treatments decreased significantly. The root activity of aloe was 200 mmol / L NaCl Under the treatment, the maximal value was reached, the salt concentration was increased, and the root activity decreased. The electrolyte leakage rate of leaves treated with salt stress was significantly higher than that of the control, and increased with the increase of stress intensity. Under salt stress, the contents of Na + and Cl- in aloe increased with the increase of salt concentration, while K + and Ca2 + showed the opposite trend. Na + accumulates mainly in stems and leaves and roots; Cl- mainly accumulates in leaves and stems, which is relatively higher than roots. Under salt stress, the content of K + and Ca2 + in Aloe was significantly lower than that in the control. With the increase of salt concentration, the content of K + in leaves increased obviously while the content of Ca2 + was opposite. Aloe leaves keep a relatively low Na + / K + ratio and strong K + and Ca2 + upward selective transport capacity, Aloe has a significant salt tolerance of the important reasons.