Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild

doi:10.1111/j.1523-1739.2009.01357.x

CORC > 武汉植物园 > 中国科学院武汉植物园

	Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild
	Huang, Hong-Wen 1,2; Yao, Xiao-Hong 1; Ye, Qi-Gang 1; Zhang, Jin-Ju 1
刊名	CONSERVATION BIOLOGY
	2010-02-01
卷号	24 期号:1 页码:246-255
关键词	ex situ collections hybridization risks Jack tree pollen dispersal Sinojackia xylocarpa S. rehderiana
ISSN号	0888-8892
DOI	10.1111/j.1523-1739.2009.01357.x
英文摘要	For endangered plants interspecific hybridization occurring in ex situ collections may lead to failure of reintroduction actions. We used Sinojackia xylocarpa, a well documented Chinese endemic species that is extinct in the wild, as a model case to address this concern. We used paternity analyses to assess the spontaneous hybridization and patterns of pollen flow between S. xylocarpa and its congener species, S. rehderiana, in conserved populations in Wuhan Botanic Garden. Interspecific hybridization events were detected in seven out of eight maternal trees of S. xylocarpa, and an average of 32.7% seeds collected from maternal trees of S. xylocarpa were hybrids. The paternity of 93 out of 249 seedlings from S. xylocarpa assigned to S. rehderiana provided convincing evidence that spontaneous interspecific hybridization occurred extensively in the living garden collection we studied. Different patterns of pollen dispersal (predominantly short-distance vs. long-distance pollination) were observed between intra-and interspecific hybridization events in the garden. Pollen dispersal within the ex situ populations was not restricted by distance, as evidenced by a lack of significant correlations between the average effective pollen dispersal distance (delta) and the geographic distances (d1 and d2) between maternal and paternal trees. The interspecific pollen-dispersal distance ranged from 10 to 620.1 m (mean 294.4 m). Such extensive hybridization in ex situ collections could jeopardize the genetic integrity of endangered species and irrevocably contaminate the gene pool if such hybrids are used for reintroduction and restoration. We recommend strongly that measures be taken to minimize the genetic risks of this kind of hybridization, including establishing buffer zones in ex situ collections, manipulating flowering phenology, testing seed lots before use in reintroduction programs, and controlling pollination for seed purity.
资助项目	Chinese Academy of Sciences[KSCX2-YW-Z-0941] ; Chinese Academy of Sciences[KSCX2-YW-N-061] ; Chinese Academy of Sciences[KSCX2-YW-Z054] ; Natural Scientific Foundation of China[30370153]
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY-BLACKWELL PUBLISHING, INC
WOS记录号	WOS:000273686700030
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/979]
专题	中国科学院武汉植物园
通讯作者	Yao, Xiao-Hong
作者单位	1.Chinese Acad Sci, Wuhan Bot Garden Wuhan Inst Bot, Wuhan 430074, Peoples R China 2.Chinese Acad Sci, S China Inst Bot, S China Bot Garden, Guangzhou 510650, Peoples R China
推荐引用方式 GB/T 7714	Huang, Hong-Wen,Yao, Xiao-Hong,Ye, Qi-Gang,et al. Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild[J]. CONSERVATION BIOLOGY,2010,24(1):246-255.
APA	Huang, Hong-Wen,Yao, Xiao-Hong,Ye, Qi-Gang,&Zhang, Jin-Ju.(2010).Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild.CONSERVATION BIOLOGY,24(1),246-255.
MLA	Huang, Hong-Wen,et al."Spontaneous Interspecific Hybridization and Patterns of Pollen Dispersal in Ex Situ Populations of a Tree Species (Sinojackia xylocarpa) that is Extinct in the Wild".CONSERVATION BIOLOGY 24.1(2010):246-255.