Phenotypic Variation and Diversity of Cauliflower (Brassica oleracea Var. Botrytis) Inbred Lines

作者：Zhu, Shiyang; Zhang, Xiaoling; Liu, Qing; Luo, Tiankuan; Tang, Zheng; Zhou, Yuanchang^*

来源：International Journal of Agriculture and Biology, 2018, 20(5): 1041-1048.

DOI：10.17957/IJAB/15.0601

• Morphological trait
• Genetic diversity
• Genetic variance
• Principal component analysis
• Cluster analysis
• Cauliflower breeding

Inbred lines are important germplasm in cauliflower breeding programs. Knowledge on genetic variation and diversity of cauliflower inbred lines may be important to decide on breeding strategies for parent's selection during hybridization. In this study, the phenotypic diversity of 165 cauliflower inbred lines was evaluated based on ten quantitative traits and twenty qualitative traits. The experiment was conducted in field (sandy clay loam having pH of 6.8) at the Experimental Farm of Wenzhou Academy of Agricultural Science, Wenzhou, Zhejiang Province of China. Plants were arranged as randomized complete block with two replicates. Data were recorded during July 2015 to January 2016. Extensive variability was observed for most quantitative traits and qualitative traits with coefficients of variation (CV=13.7-42.6%) and Shannon Weaver diversity index (H'=0.50-1.57) among the assayed genotypes, respectively. In which, the curd weight and stem color in curd showed highest degree of genetic variation and diversity. Phenotypic traits were categorized by principal components analysis (PCA) into 10 components which explained 71.64% of the total variation. Days to curd appearing, plant breadth, plant height, length of leaf, width of leaf, lengthways diameter of curd, curd weight, solidity of curd, stem color in curd were main optimized phenotypic traits for evaluation during breeding programs. These inbred lines were grouped into six different clusters. Based on cluster-mean, desirable recombination may be obtained by crossing inbred lines belong to different clusters. There were no association between morphological traits and geographical origin indicated that both genetic variation and geographical locations of the genotypes should be considered comprehensively in breeding programs for parent's selection. These findings of genotypic variation and diversity in phenotypic traits expressed usefulness of these inbred lines as parent materials for further utilization in cauliflower breeding programs.

• 出版日期2018
• 单位福建农林大学