Research on the nutphenotypic traits and diversities of walnut in western Hunan

LI Jianhui, LI Bohai, WU Sizheng, BAI Wenfu, YU Lin, NIE Dongling, YAN Jiawen, XIONG Ying, XIANG Zuheng, PENG Xianfeng

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 171-179.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (1) : 171-179. DOI: 10.12302/j.issn.1000-2006.202109004

Research on the nutphenotypic traits and diversities of walnut in western Hunan

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Abstract

【Objective】 This study aimed to understand the phenotypic diversity of walnut resources in western Hunan, to provide a theoretical reference for the development and utilization of walnut resources. 【Method】 A total of 223 walnut resources from Longshan County, Luxi County, Jingzhou County, and Shimen County in Hunan were used to measure the phenotypic quality and quantitative characteristics of nuts. Diversity and cluster analyses of 21 phenotypic characteristics were conducted. 【Result】 The coefficient of variation of walnut quality traits in western Hunan ranged from 18.71% to 79.21%, and the Simpson and Shannon Wiener indices ranged from 0.171 to 0.823, and 0.450 to 2.760, respectively. The coefficient of variation of quantitative traits ranged from 8.37% to 27.49%. The nut weight ranged between 5.28 and 31.70 g, and there were four small walnut resources that weighed less than 7 g, and four large walnut resources whose weight exceeded 22 g. In addition to the nut phenotypic traits described based on the “Guidelines for the conduct of tests for distinctness, uniformity, and stability-Juglans (Juglans)”, there were eight unreported nut traits in this study. Among them, three for nut shape, three for shape of longitudinal section perpendicular, one for shape of cross-section, and one for skin color of kernels. The average coefficient of phenotype differentiation was 64.03%, and the variation in the 21 phenotypic traits among populations was larger than that within populations in this area. The results of the cluster analysis showed that 15 populations could be divided into four groups at a Euclidean distance of 15. The Mantel test showed that there was a significant positive correlation between Euclidean distance and geographical distance (R=0.502, P= 0.023). 【Conclusion】 The phenotypic diversity of walnuts in western Hunan was abundant, and this phenotypic diversity was manifested itself in the form of an array of phenotypic clusters.

Key words

Juglans regia and J. sigillata(walnut) / phenotypic traits / diversity / western Hunan Province

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LI Jianhui , LI Bohai , WU Sizheng , et al . Research on the nutphenotypic traits and diversities of walnut in western Hunan[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2023, 47(1): 171-179 https://doi.org/10.12302/j.issn.1000-2006.202109004

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