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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, Mallikarjuna3; Salick, Jan M.1; Miller, Allison J.4; Yang Yongping5; Liu Lin6; Hai Xian6
Corresponding Authorbee.gunn@anu.edu.au
2010-04-01
Source PublicationAMERICAN JOURNAL OF BOTANY
ISSN0002-9122
Volume97Issue:4Pages:660-671
AbstractWalnuts 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.
KeywordAgrobiodiversity China Juglandaceae Juglans Sigillata Juglans Regia Kinship Microsatellites Population Genetics Tibetan Walnuts Yunnan
Subject AreaPlant Sciences
DOI10.3732/ajb.0900114
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000276045500013
Citation statistics
Cited Times:33[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/2631
Collection中国科学院青藏高原研究所昆明部
Affiliation1.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
Recommended Citation
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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