| 【Objective】The study was conducted to identify the phenotypic diversity of avocado germplasms collected from western Guangdong, and improve the utilization of avocado germplasm resources.【Method】fifty-three avocado germplasm resources preserved in the National Field Genebank for Tropical Fruits were used as test materials. Partial correlation analysis, principal component analysis and cluster analysis were used to identify 7 quality traits （leaf shape, leaf margin, blade tip shape, leaf color, leaflet form, flower type, and petiole groove） and 12 quantitative traits （branch diameter, internode length, blade length, blade width, leaf index, petiole length, inflorescence cross length, inflorescence width, inflorescence rachis length, flower stem length, petal length, and sepal length）.【Result】Avocado was rich in phenotypic trait diversity, and the genetic diversity indexes of quality traits and quantitative traits ranged in 0.094-1.228 and 1.373.22-1.921, respectively, which indicated that the diversity of quantitative traits was richer than that of quality traits. Twenty-nine pairs were extremely significantly correlated and Twenty-nine pairs were significantly correlated among the 19 phenotypic traits. The results of principal component analysis showed that the cumulative contribution rate of the 6 principal component factors was 72.396%, and petiole length, branch diameter, petal length, inflorescence cross length, leaf margin and leaflet form were selected as the main traits. Cluster analysis showed that the 53 tested materials could be divided into 4 groups when the Euclidean distance was 15. The inflorescences of avocado germplasm resources in Group I were smaller, the branch diameters of avocado germplasm resources in Group II were the largest, the blade widths of avocado germplasm resources in Group III were the narrowest, and the inflorescence cross lengths of avocado germplasm resources in Group IV were llongest.【Conclusion】The phenotypic trait diversity of the 53 avocado germplasm resources collected and preserved in western Guangdong was rich, and there were some correlations among the 19 investigated phenotypic traits, among which the petiole length, branch diameter, petal length, inflorescence cross length, leaf margin and leaflet form could be used as the main traits for
the evaluation and breeding of avocado. |
