摘要
在电子显微镜下对银杏 (GinkgobilobaL .)枝条营养贮藏蛋白质的超微结构特征及季节性变化规律进行了系统研究。结果表明 :银杏营养贮藏蛋白质主要存在于韧皮薄壁细胞的液泡内。银杏韧皮薄壁细胞内的营养贮藏蛋白质在细胞质内合成 ,由内质网和高尔基体小泡参与贮藏蛋白质的合成和积累。液泡蛋白质主要以不定形块状、絮状或颗粒状形态存在。贮藏蛋白质在整个越冬期间一直保持高含量水平 ,直到翌年春季芽萌发时 ,贮藏蛋白质迅速转移再利用。随着新梢的生长 ,到了夏末秋初 。
The ultrastructural characteristics and seasonal changes of vegetative storage protein(VSPs) of Ginkgo biloba. L were systemically studied by electron microscope. The results indicated that the vegetative storage protein(VSPs) of Ginkgo biloba. L presented mainly in the small vacuoles of the phloem parenchyma cells. VSPs of phloem parenchyma cells were produced in cytoplasm, then separated by the inflated cisternae of endoplasmic reticulum (ER), plasmalemma invagination or Golgi body vesicles, resulting in the formation of vacuole with the protein inside as vacuolar content. Three different forms of VSPs were detected: granular, floccular and massive VSPs, which distributed in different tissue cells, different cells of the same tissue or different vacuoles of the same cells. VSPs accumulated in fall and kept high level throughout the winter, until the next spring the bud broke, VSPs were almost mobilized completely. With new shoots growing, VSPs resumed to accumulate in late summer and early fall.
出处
《电子显微学报》
CAS
CSCD
北大核心
2002年第2期141-145,共5页
Journal of Chinese Electron Microscopy Society
基金
国家自然科学基金资助项目 (No .3 980 0 115 )~~
关键词
季节变化
银杏
营养贮藏蛋白质
氮贮藏
超微结构
Ginkgo biloba
vegetative storage protein(VSPs)
nitrogen storage
ultrastructure
