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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
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| Corresponding Author | bee.gunn@anu.edu.au |
| 2010-04-01 | |
| Source Publication | AMERICAN JOURNAL OF BOTANY
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| ISSN | 0002-9122 |
| Volume | 97Issue:4Pages:660-671 |
| Abstract | 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. |
| Keyword | Agrobiodiversity China Juglandaceae Juglans Sigillata Juglans Regia Kinship Microsatellites Population Genetics Tibetan Walnuts Yunnan |
| Subject Area | Plant Sciences |
| DOI | 10.3732/ajb.0900114 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000276045500013 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.kib.ac.cn/handle/151853/2631 |
| Collection | 中国科学院青藏高原研究所昆明部 |
| Affiliation | 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 |
| 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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