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以欧美杨(Populus canadensis)南杨1号和南杨2号为实验材料,研究了NaCl胁迫对其幼苗生长、细胞超微形态结构和离子分配等的影响。结果发现,低盐(75mmol·L–1NaCl)胁迫对南杨1号生长的抑制显著高于南杨2号;高盐(150mmol·L–1NaCl)胁迫对2种品系生长的抑制则差异不显著。低盐胁迫下,南杨1号叶片细胞结构破坏程度明显高于南杨2号;南杨2号根中所有细胞,新生枝条表皮、皮层及木质部细胞,叶片上表皮、栅栏和海绵组织细胞均维持较低的Na+含量,同时叶片栅栏和海绵组织细胞维持较高的Mg2+含量,从而表现为向枝条和叶片的Na+流量显著偏低。维持细胞内的离子稳态可能是南杨2号耐盐性高于南杨1号的重要原因。
Populus canadensis Nan Yang 1 and Nan Yang 2 were used as experimental materials to study the effects of NaCl stress on their seedling growth, ultrastructure and ion distribution. The results showed that the inhibition of low salt (75mmol·L-1NaCl) on the growth of Nan Yang 1 was significantly higher than that of Nan Yang 2; the inhibition of the growth of the two strains was not significantly different under high salt (150 mmol·L-1 NaCl) . Under low salt stress, the cell structure of Nan Yang 1 was more damaged than that of Nan Yang 2. All the cells in the roots of Nan Yang 2, the epidermis, cortex and xylem cells, the epidermis, palisade and sponge cells Maintain a low content of Na +, at the same time, the leaf fence and spongy tissue cells maintain high Mg2 + content, which shows that the Na + flux to branches and leaves is significantly lower. Maintaining intracellular ionic homeostasis may be an important reason for the higher salt tolerance of Nan Yang 2 than that of Nan Yang 1.