Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China

doi:10.1139/B07-101

	Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China
	Xue, Chun-Ying; Wang, Hong; Li, De-Zhu
	2007-10-01
发表期刊	CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
卷号	85 期号:10 页码:964-975
摘要	Musella is a monotypic genus composed of a single species, Musella lasiocarpa (Franch.) C.Y. Wu ex H.W. Li, endemic to Southwestern China. The genus status of Musella remains controversial. Musella had been placed first in Musa, then in Ensete, and back to Musa before its monotypic status was recognized. Musella was reported to be extinct in the wild and maintained through cultivation only via vegetative propagation through sprouting of rhizomes. In this study, female gametophyte and seed development of Musella are described to assess its systematic position and possible reasons why the wild population is now extinct. The ovules are anatropous, bitegmic, and crassinucellar. The micropyle is formed by both integuments. The megaspore mother cell undergoes meiotic division and forms a linear megaspore triad or more rarely, a T-shaped megaspore tetrad. The chalazal megaspore develops into a Polygonum type embryo sac. A nucellar pad forms, and a hypostase differentiates. Fertilization is porogamous. Endosperm formation is of the nuclear type. The zygote degenerates and so the process by which the embryo develops, if it does, remains unclear. An operculum, micropylar collar, and chalazal chamber form in mature seeds. The storage tissue is mainly endosperm containing large, compound starch grains and some perisperm. The seed coat has lignified exotestal cells, 25-30 cell layers of sclerotic mesotestal cells, and unspecialized endotesta cells; the tegment consists of two layers of longitudinally elongated cells. The seed is inviable. After comparison with the other Musaceae s. str. taxa using embryological and botanical features, we conclude that Musella should be a distinct genus. Female sterility in Musella may be the main reason why the wild population is extinct. Based on these findings, we propose conservation strategies for this endemic species, including habitat protection as well as ex-situ conservation.
关键词	Female Gametophyte Seed Development Phylogeny Musaceae Musella Conservation Strategy
学科领域	Plant Sciences
DOI	10.1139/B07-101
收录类别	SCI
语种	英语
WOS记录号	WOS:000252310000008
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/2755
专题	中国科学院东亚植物多样性与生物地理学重点实验室
作者单位	Chinese Acad Sci, Kunming Inst Bot, Lab Biodivers & Biogeog, Kunming 650204, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Xue, Chun-Ying,Wang, Hong,Li, De-Zhu. Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China[J]. CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE,2007,85(10):964-975.
APA	Xue, Chun-Ying,Wang, Hong,&Li, De-Zhu.(2007).Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China.CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE,85(10),964-975.
MLA	Xue, Chun-Ying,et al."Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China".CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE 85.10(2007):964-975.

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