Comprehensive Characterization and Analysis of Key Agronomic Traits and Glucosinolate Profiles in Leaf Mustard

Abstract

Leaf mustard (Brassica juncea) is an important leafy vegetable highly valued for its diverse flavor and nutrient compounds, particularly glucosinolates. However, different varieties of leaf mustard exhibit substantial phenotypic variation and varying glucosinolate content. In this study, we systematically assessed the phenotypic variability and glucosinolate content among 86 genotypes of leaf mustard. The Shannon-Wiener index for qualitative traits ranged from 0.10 (leaf surface gloss) to 1.60 (leaf shape), while for quantitative traits, it ranged from 1.85 (petiole length) to 2.07 (leaf width). Cluster analysis grouped the accessions into three distinct clusters, with hierarchical clustering indicating that yield-related traits were the primary factors distinguishing these groups. Principal component analysis (PCA) revealed that eight components accounted for 87.44% of the total variance in yield and glucosinolate attributes. Based on comprehensive scoring, the top five genotypes (A645, A464, A512, A702, and A445), exhibiting diverse characteristics, were identified as promising candidates for breeding programs. Moreover, our results suggest that leaf mustard leaves with deeper or more numerous lobes contain higher concentrations of glucoraphanin. Collectively, these findings provide valuable genetic resources to advance leaf mustard breeding.

Keywords

Brassica juncea / Germplasm evaluation / Agronomic traits / Correlation analysis

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