Population genetic insights into the conservation of common walnut (Juglans regia) in Central Asia
Ye L. Shavvon R.S. Qi H. Wu H. Fan P. Shalizi M.N. Khurram S. Davletbek M. Turuspekov Y. Liu J.
September 2024KeAi Publishing Communications Ltd.
Plant Diversity
2024#46Issue 5600 - 610 pp.
The common walnut (Juglans regia) is one of the most economically important nut trees cultivated worldwide. Despite its importance, no comprehensive evaluation of walnut tree population genetics has been undertaken across the range where it originated, Central Asia. In this study, we investigated the genetic diversity and population structure of 1082 individuals from 46 populations across Central Asia. We found moderate genetic diversity of J. regia across Central Asia, with 46 populations clustered into three groups with a weak relationship between genetic and geographic distance. Our findings reveal that the western Himalaya might be the core region of common walnut genetic diversity in Central Asia and that, except for two populations in Gongliu Wild Walnut Valley, humans might have introduced walnut populations to Xinjiang, China. The observed distribution of the genetic landscape has probably been affected by historical climate fluctuation, breeding system, and prolonged anthropogenic activity. We propose the conservation of the core genetic diversity resources in the western Himalaya and pay special attention to populations from Gongliu in Xinjiang. These findings enhance our understanding of the genetic variation throughout the distribution range of J. regia in Central Asia, which will provide a key prerequisite for evidence-based conservation and management.
Central Asia , Genetic diversity , Germplasm management , Gongliu wild walnut valley , Juglans regia , Western Himalaya
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CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan, Kunming, 650201, China
Key Laboratory of Plant Resources and Biodiversity of Jiangxi Province, Jingdezhen University, Jiangxi, Jingdezhen, 333400, China
Germplasm Bank of Wild Species & Yunnan Key Laboratory of Crop Wild Relatives Omics, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan, Kunming, 650201, China
Department of Biology, Faculty of Science, Yasouj University, Yasouj, 75918-74934, Iran
University of Chinese Academy of Sciences, Beijing, 100049, China
Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, 27695, NC, United States
Department of Forestry and Natural Resources, Faculty of Agriculture, Kabul University, Kabul, D-1006, Afghanistan
National Academy of Science of the Kyrgyz Republic, Jalal-Abad Scientific Center, Jalal-Abad, 715600, Kyrgyzstan
Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty, 050040, Kazakhstan
CAS Key Laboratory for Plant Diversity and Biogeography of East Asia
Key Laboratory of Plant Resources and Biodiversity of Jiangxi Province
Germplasm Bank of Wild Species & Yunnan Key Laboratory of Crop Wild Relatives Omics
Department of Biology
University of Chinese Academy of Sciences
Department of Forestry and Environmental Resources
Department of Forestry and Natural Resources
National Academy of Science of the Kyrgyz Republic
Laboratory of Molecular Genetics
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