Basic Characteristics, Superior Individual Selection, and Comprehensive Evaluation of 12 Wild Vernicia fordii (Vernicia fordii (Hemsl.) Airy Shaw) Trees in the Hunan–Guizhou Region

The tung tree, a crucial woody oil plant, serves as a premium raw material for eco-friendly coating production, yet its short lifespan (typically under 20 years) and lack of asexual reproduction have led to resource losses. This study surveyed wild tung trees in the Hunan–Guizhou region, focusing on older and high-fruit-yielding specimens. After two years of investigation, selected individuals were conserved in the Wugang Tung Tree Germplasm Resource Bank to provide high-quality materials for breeding superior varieties. Comparative analysis of fruit yield and commercial traits from 60 wild trees identified 12 superior individuals for secondary selection, with notable trait variations observed. Using the entropy weight-TOPSIS method, superior individual FT01 exhibited the highest relative closeness (C = 0.6836), indicating optimal overall traits, while FT01, XY12, JX01, WG25, and WG31 (all with C > 0.50) demonstrated good overall performance. Genetic diversity analysis of these 12 individuals, employing 14 SSR primers, revealed 33 alleles (average 2.2142 per primer), Shannon’s information index values ranging from 0.1973 to 0.9723 (average 0.5325), and polymorphism information content between 0.1486 and 0.5833 (average 0.3981), indicating high genetic diversity. UPGMA clustering divided the superior trees into five groups, with FT01, WG25, JX01, and XY12 in separate groups, all exhibiting high yield and large fruit size, consistent with TOPSIS results. Consequently, FT01, XY12, JX01, WG25, and WG31, with the highest comprehensive evaluation scores and richest genetic diversity, are prioritized as candidate materials for new variety selection and breeding.