CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA

doi:10.3417/2008015

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	CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA
	Sun, Bao-Ling 1,2; Zhang, Chang-Qin 1; Lowry, Porter P., II 3,4; Wen, Jun 5
通讯作者	zhangchangqin@mail.kib.ac.cn ; wenj@si.edu
	2009
发表期刊	ANNALS OF THE MISSOURI BOTANICAL GARDEN
ISSN	0026-6493
卷号	96 期号:4 页码:672-684
摘要	Nyssa yunnanensis W. Q. Yin ex H. N. Qin & Phengklai (Nyssaceae) is a critically endangered range-restricted tree species known from only three small populations in a tropical forest area of southern Yunnan Province, southwestern China. Two types, of individuals occur, one bearing staminate flowers and the other with morphologically perfect flowers that produce both pollen and fruit suggesting an androdioecious breeding system. Field an(] laboratory studies conducted between 2004 and 2007 indicate, however, that N yunnanensis is functionally dioecious: pollen front the morphologically perfect flowers is inaperturate and inviable, rendering the trees that bear these flowers functionally female. Field observations showed that the staminate flowers opened 10 to 15 (lays earlier than the protogynous female flowers hot that flowering ceased ill nearly the same time in both sexes. Thirty-six species of insects were observed and collected visting the flowers of N. yunnanensis, four of which served as effective pollinators. Breeding system experiments demonstrated that the predominantly entomophilous pollination system is supplemented by anemophily and further indicated that X yunnanensis is xenogamous and does not appear to exhibit parthenogenesis. The average sex ratio of individuals within the three populations was female-biased (0.5-1:1), but the ratio among flowers was male-biased (2.56:1) because flower production was higher in males. The 37 known trees of N. yunnanensis are likely the remnants of a once more widespread, abundant species that has been heavily impacted by human disturbance, it fine shared with many other threatened Southeast Asian taxa whose continued survival will require dedicated conservation efforts informed by it detailed understanding of population structure an(] reproductive biology.
关键词	Androdioecy Critically Endangered Cryptic Dioecy Floral Phenology Iucn Red List Nyssa Nyssa Yunnanensis Nyssaceae Pollen Viability
学科领域	Plant Sciences
DOI	10.3417/2008015
收录类别	SCI
语种	英语
WOS记录号	WOS:000273406600005
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/13483
专题	离退休
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Missouri Bot Garden, St Louis, MO 63166 USA 4.Museum Natl Hist Nat, Dept Systemat & Evolut, F-75231 Paris 05, France 5.Smithsonian Inst, Dept Bot, Natl Museum Nat Hist, Washington, DC 20013 USA
推荐引用方式 GB/T 7714	Sun, Bao-Ling,Zhang, Chang-Qin,Lowry, Porter P., II,et al. CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA[J]. ANNALS OF THE MISSOURI BOTANICAL GARDEN,2009,96(4):672-684.
APA	Sun, Bao-Ling,Zhang, Chang-Qin,Lowry, Porter P., II,&Wen, Jun.(2009).CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA.ANNALS OF THE MISSOURI BOTANICAL GARDEN,96(4),672-684.
MLA	Sun, Bao-Ling,et al."CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA".ANNALS OF THE MISSOURI BOTANICAL GARDEN 96.4(2009):672-684.

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