Genetic variation and phylogenetic relationships of some distinguished edible cabbages

초록

The genus Brassica, known as oil crops or vegetables, is widely cultivated in Canada, Australia, Asian and European countries. As Brassica species have high yields and good environmental adaptation, abundant germplasm and hybrids with various genetic diversity and elite characteristics were bred out. However, it brought difficulties on the understanding of their genetic diversity and phylogenetic relationships. In this study, we collected 19 distinguished edible cabbages including Brassica campestris L., B. oleracea L. and Salvia plebeian R. and evaluated their genetic variation based on nrDNA ITS region sequences. S. plebeian R., called savoy cabbage in the folk and considered as one of allied Brassica vegatables, was just selected as the outgroup. Seen from the phylogenetic tree, B. oleracea L. was completely separated out of the Brassica group, but the other two B. oleracea L. accessions were positioned inside. Due to hybridization, B2, B15 and B18 showing three different types of leaf profile were exactly divided into one group. Involved in the subgenus genetic relationship, B. oleracea showed higher genetic diversity than B. campestris. This report provided more evidences for evaluating the genetic variation of Brassica species. Our results would conduct functional plant breeding and trait improvement of Brassica. © 2018 World Research Association. All rights reserved.

키워드