Female gametophyte and seed development in Musella lasiocarpa (Musaceae), a monotypic genus endemic to Southwestern China
Xue, CY ; Wang, H ; Li, DZ
2007
发表期刊CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
ISSN0008-4026
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
学科领域Plant Sciences
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/2749
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
推荐引用方式
GB/T 7714
Xue, CY,Wang, H,Li, DZ. 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, CY,Wang, H,&Li, DZ.(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, CY,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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