NaCl处理对空心莲子草营养器官解剖结构的影响

Effect of NaCl stress on the anatomic structure of Alternanthera philoxeroides Griseb vegetative organs

利用光学显微技术,对不同浓度NaCl处理后的空心莲子草的营养器官进行形态解剖学研究。结果表明:不同浓度的NaCl处理下生长的空心莲子草解剖结构与对照相比发生了显著变化,这些变化表现为:随着盐浓度的逐渐增加,叶片面积变小而厚度增加;茎的横向生长受抑制;角质膜进一步增厚;营养器官的通气组织进一步发达,根、茎、叶中的胞间隙或孔隙紧密相连,使植物体上下贯通进行气体交换;根中的木栓细胞层数增加。

The morphological anatomy of vegetative organs of Alternanthera philoxeroides under different concentration of NaCl stress was researched by using the optics microscope technology. The result indicated that there was remarkable change in dissection structure of A. philo.reroides vegetative organs under NaCl stress compared with CK. These changes were manifested as follows： with the increase of NaCl concentration, the area and thickness of leaf blades decreased; the horizontal growth of stem was inhibited; the thickness of cuticle increased; the aerenchyma of vegetative organs further developed; the intercellular space（crevice）in root, stem and leaf were closely connected, which benefited the exchange of air among the different parts of a plant;and the number of cell layers of cork cambinm（phellogen）in the root increased.