摘要
本文报道荔枝(Litchi chinensis Sonn.)的大小孢子发育。胚珠倒生,珠被两层,位于珠孔端靠近珠柄的外珠被不存在,而有珠孔塞。厚珠心,孔原细胞直接起大孢子母细胞作用。合点端大孢子具功能。胚囊发育为正常型。小孢子形成为连续型,成熟花粉为二细胞型。雌花柱头为湿型,具乳突细胞。两个极核在受精前融合。授粉后约64小时两个精子分别与卵和次生核融合。三个反足细胞是短命的。胚乳发育为核型。假种皮发生于外珠被。焦核品种的合子不分裂而后逐渐解体;大核品种的合子分裂发育形成胚。
The present paper deals with the embryology of Litchi chinensis Sonn. The results are summarized as follows: The ovule is anatropous, with 2 integuments, obturator present, crassinucellar, archesponal functioning directly as the megaspore mother cell. The chalazal megaspore is functional. The development of the embryo sac conforms to the normal type. The formation of the microspores is of successive type. Mature pollen grain is 2-celled. The wet stigma surface has many papillar cells. The polar nuclei fuse before fertilization. Two sperms fuse with egg cell and secondary nucleus respectively 64 hours after pollination. Three antipodal cells are ephemeral. The endosperm is of nuclear type. The aril originates from the outer integument. Zygote of the small seeded varieties degenerated; but that of the large seeded varieties develops normally into mature embryo.
出处
《云南植物研究》
CSCD
1992年第1期59-65,共7页
Acta Botanica Yunnanica
基金
国家自然科学基金
关键词
荔枝
胚胎学
Litchi chinensis
Male and Female gametophytes
Obturator
Aril
Embryo
