华南五针松幼茎发育研究

利用透射电子显微镜和光学显微镜对华南五针松(Pinuskwangtungensis)顶芽和一年生幼茎,进行形态结构和发育的观察,并进行细胞内淀粉粒含量的研究。结果表明,华南五针松幼茎在芽鳞形成后期,顶芽出现分区结构。顶芽细胞、幼茎细胞中,质体、线粒体、内质网等细胞器的分布、数量与其干旱生活的环境相适应。茎的皮层、初生木质部有树脂道分布,均为裂生型垂直树脂道,由莲座状排列的12～18个细胞发育而来。淀粉粒在树脂道发育成熟前后的动态变化与树脂的合成和分泌有一定的关系。随着各组织的发育完善,幼茎内薄壁细胞的淀粉粒呈现一个由无到丰富的动态变化。

Studies on the Development of the Young Stems of Pinus kwangtungensis

Transmission electron microscope and optical microscope technique were applied in the study of the morphology, development and starch grains in cells of terminal buds and young stems of Pinus kwangtungensis.Result is as follows:Shoot apex zones were appeared in the late period of terminal buds scale formation.The plastid, mitochondrium, endoplasmie reticulum distribution and quantity fitted the droughty living environment in the terminal bud cells, young stem cells.The cortex and the primary xylem of the young stem had resin ducts from 12~18 cells arranging the lotus form.There is a certain relationship between the dynamics state change of starch grains before and after maturity and development in resin ducts.With the growth of the organizations the starch grains in the parenchyma cells shows a non to a rich dynamics state change.