摘要
金针菜的孢原细胞在花蕾长０．５ｃｍ左右时形成，孢原细胞直接发育为大孢子母细胞。胚珠薄珠心，蓼型胚囊。开花前，胚囊的变化是：卵细胞中具很多大淀粉粒，卵细胞和助细胞的合点端壁未完全消失；助细胞的丝状器在不同发育时期形态及大小不同；极核融合为次生核；反足细胞较早退化．对大孢子发生期间胼胝质壁的动态变化及胚囊发育中液泡的变化等进行不探讨。
The archesporial cell is formed when the alabastrum length reaches 0. 5 cm or so and the macrosporocyte develops from the archesporial cell directly. The ovule is tenuinucellate and the embryo sac is of the polygonum type. The change of the embryo sac before flowering is:there are many big starches in the egg cell. The chalaza end walls of the egg cell and synergids have not disappeared totally. The morphology and size of the filiform apparatus change with the development period of the synergids. Two polar nuclei fuse into a secondary nucleus. The antipodal cells degenerated early. This paper deals with the change of the callose walls during the period of megasporogenesis and the process of vacuolation during the embryo sac development.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
1994年第3期122-126,共5页
Journal of Lanzhou University(Natural Sciences)
