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题名: CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA
作者: Sun, Bao-Ling1, 2; Zhang, Chang-Qin1; Lowry, Porter P., II3, 4; Wen, Jun5
刊名: ANNALS OF THE MISSOURI BOTANICAL GARDEN
关键词: Androdioecy ; critically endangered ; cryptic dioecy ; floral phenology ; IUCN Red List ; Nyssa ; Nyssa yunnanensis ; Nyssaceae ; pollen viability
英文摘要: 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.
出版日期: 2009
卷号: 96, 期号:4, 页码:672-684
DOI标识: 10.3417/2008015
语种: 英语
ISSN号: 0026-6493
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/13483
Appears in Collections:离退休_期刊论文

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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

Recommended Citation:
Sun, BL; Zhang, CQ; Lowry, PP; Wen, J.CRYPTIC DIOECY IN NYSSA YUNNANENSIS (NYSSACEAE), A CRITICALLY ENDANGERED SPECIES FROM TROPICAL EASTERN ASIA,ANNALS OF THE MISSOURI BOTANICAL GARDEN,2009,96(4):672-684
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