Abnormalities in sexual development and pollinator limitation in Michelia coriacea (Magnoliaceae), a critically endangered endemic to Southeast Yunnan, China
Zhao, Xingfeng1,2; Sun, Weibang1
2009
发表期刊FLORA
ISSN0367-2530
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
资助信息This study was supported by a special fund of China's Yunnan Government for qualified scientists and technicians (Grant number 2006PY-48 to W. Sun) and the generous support of Botanic Gardens Conservation International (BGCI). The authors thank: the Seedling Station of Wenshan Forest Bureau for providing the study site and helping to collect bud material; Dr. Chunying Xue, Prof. Cindy Q. Tang, and Prof. Zhijian Gu for their advice. The authors particularly thank Prof. Eliane Norman for her great help in editing the text.
收录类别SCI
语种英语
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
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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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