青海柴达木地区野生胡杨叶的形态解剖学研究

采用常规石蜡切片法,对青海柴达木地区野生胡杨叶的形态和解剖结构进行了观察和分析,探讨野生胡杨在解剖学方面适应干旱的机理。结果表明,该地区的野生胡杨叶具有明显的旱生结构特点。具体表现为:叶片厚,不等面叶;上下均由两层细胞构成复表皮,具有较厚的表皮细胞外壁与角质层;气孔下陷;具有不整齐的维管束鞘细胞,主脉韧皮纤维发达,含较多的粘液细胞;栅栏组织发达,细胞小,排列紧密;叶肉细胞含有两种结晶体——棱晶和簇晶。

Morphological and Anatomical Structure of Leaves on Populus euphratica Oliv. in Qaidam Basin

The morphological and anatomical structure of leaves on wild Populus euphratica Oliv. in Qaidam Basin was observed through the conventional paraffin section method. The results show that the leaf of wild Populus euphratica Oliv. in Qaidam Basin presents obvious xeric structure to adapt to drought stress. Leaves of Populus euphratica Oliv. are thick and isobilateral, and the up and down epidermis are made up of two-storey cells, and there are thick outer wall and cuticle on the epidermis. There are sunken stomata, irregular vascular bundle sheath cells, highly developed main vein phloem fiber, much mucous cells, highly developed palisade tissue in the leaves. There are two types of crystals, prismatic crystal and clustered crystal, in the mesophyll cells of the leaves of Populus euphratica Oliv.