NaCl对库拉索芦荟的胁迫效应研究

温室盆栽条件下，研究了100～400mmol／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，100mmoL／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400mmol／L NaCl处理下干重和叶绿素含量显著下降；芦荟根系活力在200mmol／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Ca^2＋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Ca^2＋含量明显低于对照，随着盐浓度增加，叶片K^＋含量明显增加，Ca^2＋则相反。芦荟叶片保持相对较低的Na^＋／K^＋比率和较强的K^＋和Ca^2＋向上选择性运输能力，是芦荟具有一定耐盐性的重要原因。

Study of Effect of NaCl Stress on Aloe vera

In the greenhouse,pot experiment was conducted to study the effect of 100-400 mmol/L NaCl on the growth and ion distribution of two-year Aloe vera.The results showed that the dry weight and leaf chlorophyll content of Aloe vera appeared indistinctive difference between treatments of 100 mmol/L NaCl and control,the plant dry weight and chlorophyll content showed notable decline under 200 and 400 mmol/L NaCl treatment.The root activity of Aloe vera reached the maximum value under 200 mmol/L NaCl treatment,and it decreased with the increase of salt concentration;Leaf electrolytic leakage under salt stress was higher than the control and increased with the salt concentration enhancement.Under salt stress,content of Na~(+) and Cl~(-) increased with the salt concentration,and it appeared the opposite change for the K~(+) and Ca~(2+) content in Aloe vera.Na~(+) was mainly accumulated in the stem of Aloe vera,content of Na~(+) in the leaves and root was lower;Cl~(-) was mainly accumulated in the leaves and the content in the stem was higher than the root.The content of K~(+) and Ca~(2+) in Aloe vera was lower under salt stress contrast with the control,content of K~(+) in the leaves increased obviously and the Ca~(2+) content decreased.It had lower Na~(+)/K~(+) value and stronger transportation ability for K~(+) and Ca~(2+),which were main reasons to explain salt-tolerance of Aloe vera.