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	Calcium changes in ovules and embryo sacs of Plumbago zeylanica L
	Tian, H. Q. ; Zhu, H. ; Russell, S. D. ; Tian HQ(田惠桥)
	2000
关键词	antimonate localization calcium embryo sac ovule Plumbago zeylanica
英文摘要	Calcium was localized in ovules of Plumbago zeylanica from 1 day before anthesis to 3 days after anthesis using potassium antimonate and transmission electron microscopy in pollinated and emasculated flowers. At 1 day before anthesis, embryo sacs (containing an egg cell, a central cell and zero to three accessory cells) appear mature and contain abundant calcium precipitates (ppts), in contrast to nucellar cells. At anthesis, the vacuoles of nucellar cells have enlarged, and micropylar cells, in particular, are heavily labeled with calcium ppts. As pollen tubes elongate through ovular tissues, ppts diminish in ovular cells and become concentrated in the pollen tube cell wall. After fertilization? the calcium ppts sharply diminish in fertilized ovules; in unfertilized ovules, calcium ppts remain abundant up to 3 days after anthesis (when unfertilized ovules are shed). The distribution of calcium in the ovule changes in apparent response to fertilization, suggesting that calcium content may be related to the attraction and receipt of the pollen tube. In contrast with conventionally-organized embryo sacs with synergids, Plumbago accumulates calcium in the egg cell.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/65414]
专题	生命科学－已发表论文
推荐引用方式 GB/T 7714	Tian, H. Q.,Zhu, H.,Russell, S. D.,et al. Calcium changes in ovules and embryo sacs of Plumbago zeylanica L[J],2000.
APA	Tian, H. Q.,Zhu, H.,Russell, S. D.,&田惠桥.(2000).Calcium changes in ovules and embryo sacs of Plumbago zeylanica L..
MLA	Tian, H. Q.,et al."Calcium changes in ovules and embryo sacs of Plumbago zeylanica L".(2000).

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