GENETIC VARIATION IN WALNUTS (JUGLANS REGIA AND J. SIGILLATA; JUGLANDACEAE): SPECIES DISTINCTIONS, HUMAN IMPACTS, AND THE CONSERVATION OF AGROBIODIVERSITY IN YUNNAN, CHINA

doi:10.3732/ajb.0900114

	GENETIC VARIATION IN WALNUTS (JUGLANS REGIA AND J. SIGILLATA; JUGLANDACEAE): SPECIES DISTINCTIONS, HUMAN IMPACTS, AND THE CONSERVATION OF AGROBIODIVERSITY IN YUNNAN, CHINA
	Gunn, Bee F.1,2; Aradhya, Mallikarjuna 3; Salick, Jan M.1; Miller, Allison J.4; Yang Yongping5 ; Liu Lin 6; Hai Xian 6
通讯作者	bee.gunn@anu.edu.au
	2010-04-01
发表期刊	AMERICAN JOURNAL OF BOTANY
ISSN	0002-9122
卷号	97 期号:4 页码:660-671
摘要	Walnuts are a major crop of many countries and mostly cultivated in large-scale plantations with few cultivars. Landraces provide important genetic reservoirs; thus, understanding factors influencing the geographic distribution of genetic variation in crop resources is a fundamental goal of agrobiodiversity conservation. Here, we investigated the role of human settlements and kinship on genetic variation and population structure of two walnut species: Juglans regia, an introduced species widely cultivated for its nuts, and J. sigillata, a native species cultivated locally in Yunnan. The objectives of this study were to characterize sympatric populations of J. regia and J. sigillata using 14 molecular markers and evaluate the role of Tibetan villages and kin groups (related households) on genotypic variation and population structure of J. regia and J. sigillata. Our results based on 220 walnut trees from six Tibetan villages show that although J. regia and J. sigillata are morphologically distinct, the two species are indistinguishable based on microsatellite data. Despite the lack of interspecific differences, AMOVAs partitioned among villages (5.41%, P = 0.0068) and kin groups within villages (3.34%, P = 0.0068) showed significant genetic variation. These findings suggest that village environments and familial relationships are factors contributing to the geographic structure of genetic variation in Tibetan walnuts.; Walnuts are a major crop of many countries and mostly cultivated in large-scale plantations with few cultivars. Landraces provide important genetic reservoirs; thus, understanding factors influencing the geographic distribution of genetic variation in crop resources is a fundamental goal of agrobiodiversity conservation. Here, we investigated the role of human settlements and kinship on genetic variation and population structure of two walnut species: Juglans regia, an introduced species widely cultivated for its nuts, and J. sigillata, a native species cultivated locally in Yunnan. The objectives of this study were to characterize sympatric populations of J. regia and J. sigillata using 14 molecular markers and evaluate the role of Tibetan villages and kin groups (related households) on genotypic variation and population structure of J. regia and J. sigillata. Our results based on 220 walnut trees from six Tibetan villages show that although J. regia and J. sigillata are morphologically distinct, the two species are indistinguishable based on microsatellite data. Despite the lack of interspecific differences, AMOVAs partitioned among villages (5.41%, P = 0.0068) and kin groups within villages (3.34%, P = 0.0068) showed significant genetic variation. These findings suggest that village environments and familial relationships are factors contributing to the geographic structure of genetic variation in Tibetan walnuts.
关键词	Agrobiodiversity China Juglandaceae Juglans Sigillata Juglans Regia Kinship Microsatellites Population Genetics Tibetan Walnuts Yunnan
学科领域	Plant Sciences
DOI	10.3732/ajb.0900114
收录类别	SCI
语种	英语
WOS记录号	WOS:000276045500013
引用统计	被引频次：67[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/2631
专题	中国科学院青藏高原研究所昆明部
作者单位	1.Missouri Bot Garden, William L Brown Ctr, St Louis, MO 63166 USA 2.Australian Natl Univ, Res Sch Biol, Div Evolut Ecol & Genet, Canberra, ACT 0200, Australia 3.Univ Calif Davis, USDA, Natl Clonal Germplasm Repository, Davis, CA 95616 USA 4.St Louis Univ, Dept Biol, St Louis, MO 63101 USA 5.CAS, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China 6.Shangri La Alpine Bot Garden, Diqing Prefecture, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Gunn, Bee F.,Aradhya, Mallikarjuna,Salick, Jan M.,et al. GENETIC VARIATION IN WALNUTS (JUGLANS REGIA AND J. SIGILLATA; JUGLANDACEAE): SPECIES DISTINCTIONS, HUMAN IMPACTS, AND THE CONSERVATION OF AGROBIODIVERSITY IN YUNNAN, CHINA[J]. AMERICAN JOURNAL OF BOTANY,2010,97(4):660-671.
APA	Gunn, Bee F..,Aradhya, Mallikarjuna.,Salick, Jan M..,Miller, Allison J..,Yang Yongping.,...&Hai Xian.(2010).GENETIC VARIATION IN WALNUTS (JUGLANS REGIA AND J. SIGILLATA; JUGLANDACEAE): SPECIES DISTINCTIONS, HUMAN IMPACTS, AND THE CONSERVATION OF AGROBIODIVERSITY IN YUNNAN, CHINA.AMERICAN JOURNAL OF BOTANY,97(4),660-671.
MLA	Gunn, Bee F.,et al."GENETIC VARIATION IN WALNUTS (JUGLANS REGIA AND J. SIGILLATA; JUGLANDACEAE): SPECIES DISTINCTIONS, HUMAN IMPACTS, AND THE CONSERVATION OF AGROBIODIVERSITY IN YUNNAN, CHINA".AMERICAN JOURNAL OF BOTANY 97.4(2010):660-671.

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