摘要
短柄五加（ＥｌｅｕｔｈｅｒｏｃｏｃｕｓｂｒａｃｈｙｐｕｓＨａｒｍｓ．）胚发育属茄型，棒形胚后期胚柄最为发达，球形胚期胚柄开始退化，心形胚期胚柄解体。胚乳发育属核型，当胚乳游离核为２００～３００个时，以自由生长细胞壁的方式进行胚乳细胞化。胚乳细胞进一步增殖以有丝分裂方式进行。球形胚时，胚乳组织最外层细胞特化为分泌层，胚乳细胞贮藏蛋白质和脂类物质。在胚乳游离核为３２～６４个时，单珠被的内表皮层分化为珠被绒毡层。合子分裂后，珠被绒毡层发育最为充分；棒形胚后期，珠被绒毡层被挤压；球形胚期，珠被绒毡层解体。珠被外表皮层特化为种皮。
The development of embryo of Eleutherococcus brachypus belongs to Solanad type. In the late stick embryo stage, the suspensor is most developed. In the globular embryo stage, the suspensor begins to degenerate and its disintegration occurs in the stage of heart embryo. Endosperm is nuclear type. In the stage of about 200～300 free nuclei, endosperm begins to celluarize and its number of cells further increase by mitosis. In the globular embryo stage, the most outer layer of endosperm is specialized to secretory layer. Endosperm cells reserve protein and fat. The most inner layer of single integument is differentiated into endothelium in the stage of 32～64 free nuclei. After division of zygote, the endothelium fully developed and it is pressed in the late stage of stick embryo. In the globular embryo stage, endothelium degenerates and the outer layer of integument specialized into seed vessel.
出处
《植物研究》
CAS
CSCD
北大核心
1999年第1期40-47,共8页
Bulletin of Botanical Research
基金
国家自然科学基金
关键词
短柄五加
胚
胚乳发育
珠被绒毡层
Eleutherococcus brachypus
Embryo
Endosperm
Endothelium
Development
