摘要
利用常规石蜡制片技术,对柽柳(Tamarix chinensisLour.)胚和胚乳的发育过程进行了观察。结果表明,胚发育属茄型,其基细胞先行纵裂。胚柄基部发育迅速,具吸器作用,球形胚期胚柄最为发达,其细胞质丰富,贮藏淀粉类物质,至晚心形胚期胚柄依然存在。助细胞被受精产生多胚现象。胚乳发育属核型,初生胚乳核常常晚于合子分裂,胚乳核的分裂速度慢于胚体细胞的分裂速度。当胚乳游离核为32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极少。珠心细胞只有两层,细胞核大,胞质丰富,内含贮藏物质,至心形胚期逐渐解体。
The developmental process of embryo and endosperm of Tamarix chinensis was observed by means of traditional paraffin wax sections. The following results were obtained ： The development of embryo was of Solanad type, and the division of proembryo basal cell was vertical. The basal cells of suspensor developed rapidly, which had haustorial function. At the globular embryo stage, the suspensor had well developed, which was richly cytoplasmic and contained abundant starch, and its remnants still exicted in the late heart-shaped embryo stage. Additional embryo resulted from the fertilized synergid was observed in T. chinensis. The development of endosperm was of Nuclear type. The primary endosperm nucleus division was often posterior to zygote, and its division speed was also slower than that of embryo cells. Wall formation in the endosperm was initiated at the late heart-shaped embryo when there were 32 free nuclei. Few further division occured after cellularization in the endosperm. There were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.
出处
《植物研究》
CAS
CSCD
北大核心
2006年第1期63-69,共7页
Bulletin of Botanical Research
基金
山东省教育厅项目(J01H03)
烟台师范学院科研基金项目
关键词
柽柳
胚
胚乳
发育
Tamarix chinensis
embryo
endosperm
development
