Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China

doi:10.1016/j.flora.2008.07.001

	Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China
	Zhao, Xingfeng 1,2; Sun, Weibang1
通讯作者	wbsun@mail.kib.ac.cn
	2009
发表期刊	FLORA
ISSN	0367-2530
卷号	204 期号:6 页码:463-470
摘要	Michelia coriacea (Magnoliacae) is a critically endangered tree, endemic to Southeast Yunnan province, China. Most of the individuals in the extant populations normally bear flowers, but fruit set and fertile seed production rates were only 6.7% and 0.2%, respectively. To identify possible causes of reproductive barriers, the following studies were carried out: examination of stamen and pistil development; experiments using controlled pollination; observations of behavior and frequency of floral visitors in both cultivated and natural populations. The results revealed that about 60% of pollen was abnormal and approx. 70% of ovules had delayed development. Hand pollination could effectively enhance the fruit set (F(4.25) = 35.139, P < 0.0001) and seed set per fruit (F(4.25) = 85.022, P < 0.0001). Both cultivated and wild M. coriacea had an extremely low frequency of floral visitors. Some beetles, a few species of Andremdae and some Bombus sp. are likely to be the effective pollinators. The fruit set and seed set per fruit from controlled self-pollination and cross-pollination were significantly different (P < 0.05), and thus it is inferred, that inbreeding depression may be a contributing factor in the very low seed production. It appears that low seed set in M. coriacea is due to a combination of factors: abnormalities in pollen and ovules, low number of effective pollinators, and inbreeding depression. (C) 2009 Elsevier GmbH. All rights reserved.
关键词	Michelia Coriacea Critically Endangered Tree Species Yunnan Of China Rarity Of Species Pollen Limitation
学科领域	Plant Sciences
DOI	10.1016/j.flora.2008.07.001
收录类别	SCI
语种	英语
WOS记录号	WOS:000267532400006
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/3204
专题	资源植物与生物技术所级重点实验室
作者单位	1.Chinese Acad Sci, Kunming Bot Garden, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Xingfeng,Sun, Weibang. Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China[J]. FLORA,2009,204(6):463-470.
APA	Zhao, Xingfeng,&Sun, Weibang.(2009).Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China.FLORA,204(6),463-470.
MLA	Zhao, Xingfeng,et al."Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China".FLORA 204.6(2009):463-470.

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