Comprehensive evaluation of 36 wild Camellia oleifera resources traits in Ya'an, Sichuan Province

The qualitative and quantitative traits of 36 wild Camellia oleifolia resources in Ya'an, Sichuan Province were evaluated comprehensively to provide a theoretical basis for breeding suitable local C. oleifera cultivars.

The 17 quality characters and 19 quantitative characters of 36 wild C. oleifera resources were determined. The Shannon-Wiener diversity index analysis, significance analysis, principal component analysis and cluster analysis were used to comprehensively evaluate the wild C. oleifera resources with better comprehensive performance.

The results showed that the genetic diversity of 17 quality traits of 36 wild C. oleifera resources was relatively rich, and the diversity index of fruit shape and seed shape was the largest (1.390 5 and 1.412 3, respectively). The analysis of 19 quantitative characters showed that 36 wild C. oleifera resources have abundant genetic variability in quantitative characters, and the coefficient of variation ranged from 1.54% to 54.02%. The variation coefficients of seed number, fruit weight and fruit oil content were the largest, which were 52.04%, 46.07% and 41.52%, respectively. TQ3 had the largest seed number (7.07), TQ13 had the largest fruit weight (42.73 g), and TQ14 had the largest oil content (12.10%). The number of seeds, the quality of fresh fruit and the oil content of fresh fruit were of great significance in the evaluation of the excellent degree of C. oleifera resources. The comprehensive calculation and score based on principal component analysis showed that TQ14, TQ16 and TQ10 had the highest comprehensive scores and had high breeding potential. The 36 wild C. oleifera resources were divided into 6 categories by systematic cluster analysis. TQ14, TQ16 and TQ10 with good comprehensive performance were grouped into one category, and TQ20 with poor comprehensive performance were grouped into one category alone.

The quality and quantity traits of 36 wild C. oleifera resources had relatively rich genetic diversity, and TQ14, TQ16 and TQ10 wild C. oleifera resources had better comprehensive traits, which laid a foundation for the subsequent breeding of local C. oleifera varieties in Ya'an.