华南五针松叶发育的研究

Studies on the development of the leaf of Pinus kwangtungensis

关键词:  华南五针松  叶  发育

Key words:  Pinus kwangtungensis  leaf  development

摘要:

利用光学显微镜和电子显微镜对华南五针松叶的生长和发育进行研究,结果表明:华南五针松叶为单脉序的三棱形针状叶,气孔分布在腹面,为单环型; 皮下层一到两层; 内皮层明显; 转输组织为松型; 树脂道三个,出现两个边生、一个中生或缺,三个中生,三个边生,仅二个中生等类型; 叶缘的细齿由表皮细胞壁形成。气孔器发育方向是先中央后两端,在部分区域具有合并及不连续的现象。

Abstract:

Optical microscope and electron microscope were applied in the study of the growth and development of the leaves of Pinus kwangtungensis. The results are as follows:the triangulate needle with simple venation,single-cyclocytic type of stomata on venterof the epidermis,one or two layers hypodermis,transfusion tissue of pine type,endodermis are obvious; three resin ducts formed five types:only two middle type,only two edge type,one middle or not type,three edge type,and three middle type; the serrulate margin of leaves developed from the epidermis'cell wall. The stomatal apparatus developed from the middle to the edges with mergence and discontinuance in some region.