Genetic Diversity in Brassica integrifolia

Background: Because of the large genetic variation, local varieties of Brassica integrifolia serve as a good germplasm resource for developing new varieties. This study was conducted to assess the level of genetic diversity through heritability coefficients, clustering collected samples and selecting clusters with the highest growth and yield traits. Methods: The experiment was conducted at the College of Agriculture, Can Tho University from October 2023 to January 2024. The experimental materials included 36 accessions of B. integrifolia collected from different areas of Can Giuoc district, Long An province, Vietnam. The experiment was arranged in a completely randomized block design with one factor, 36 treatments and three replications. The parameters of 11 quantitative traits were recorded to calculate genetic parameters. Result: All collected local sources of B. integrifolia accession showed differences for most of the traits. The results of the study showed that the heritability was very high ( greater than 80%) combined with high genetic advance ( greater than 20%) for 11 quantitative traits, indicating that these traits are under the control of genetics and are not affected by environmental factors, while the remaining traits showed a tendency to change due to environmental factors. Through hierarchical cluster analysis, the quantitative traits of 36 B. integrifolia accession were divided into 4 clusters. Cluster III contained bestest germplasm sources. This study showed a great diversity in growth, yield and yield component traits, contributing a valuable genetic source for B. integrifolia breeding.