NaCl胁迫对扁桃砧木叶片显微结构的影响

采用新疆常用的扁桃砧木石头扁桃和桃扁桃的1年生实生苗为材料，研究了不同浓度NaCl对其叶片显微结构的影响。结果表明：（1）两个砧木在75mmol/LNaCl处理10d和20d后叶片结构没有明显变化。（2）石头扁桃在150mmol/LNaCl处理10d后表现出叶肉极显著加厚；栅栏组织细胞和海绵组织细胞显著变长，同时栅栏组织细胞数目增多排列比较紧密。随着盐浓度的增加和胁迫时间的延长也发生了类似的变化，但是栅栏组织细胞和海面组织细胞形状变的很不规则。（3）桃扁桃在300mmol/LNaCl处理10d后才表现出明显反应，栅栏组织细胞和海绵组织细胞变长，栅栏细胞排列紧密且发达。300mmol/LNaCl处理20d后出现类似的变化，但不显著。不同盐浓度间叶肉厚度变化不显著。综合比较发现石头扁桃对NaCl比较敏感,同样时间的NaCl胁迫后，石头扁桃的叶片在150mmol/LNaCl胁迫下变化极显著，而桃扁桃在300mmol/LNaCl胁迫后变化明显；整个处理过程中桃扁桃的叶片结构变化幅度不及石头扁桃。

Effects of NaCl Stress on Microstructure of Almond Rootstocks

1-year-old Shitou almond and A. communis par. persiooides that were often used in Xinjiang were used as the materials in the experiment; effects of different NaCl concentrations on microstructure of leaves were studied. The results showed that: (1) There was no changes of leaves on two rootstocks after 10 and 20 days' treatment of 75mmol/L NaCl. (2)After 10 days' treatment of 150mmol/L NaCl, the mesophyl of Shitou almond was obvious thicker, the cells of palisade tissues and spongy tissues became longer; the amount of palisade tissues cells was more ,which arrange more compact. With the salt concentration increasing and time prolonging, the same reflections were happened, but the shape of palisade tissues and spongy tissues cells became more deformed. (3)There were some obvious reflections of A. communis par. persiooides only after 10 days'treatment of 300mmol/L NaCl, the palisade tissues and spongy tissues cells became longer, the palisade tissues cells arrange more compact and became flourishing. The same reflections were happened after 20 days'treatment of 300mmol/L NaCl, but which was no obvious. Three were no obvious changes for the thickness of mesophyll under different concentrations. After comprehensive comparing, we found Shitou almond was more sensitive to NaCl stress, the leaves made obvious reflections under 150mmol/L NaCl. The leaves on A. communis par. persiooides has various under 300mmol/L NaCl, the variety extent of leaves on A. communis par. persiooides was little in the whole treatments.