Author(s):

Suman Yadav and Anil Pandey

Abstract: Indian mustard (Brassica juncea L.) germplasm consisting twenty accessions including one National and two zonal check cultivars were evaluated for quantitative traits. The present study was conducted to investigate genetic diversity and correlation among studied genotypes of B. juncea L. based on agro-morphological at research farm of TCA Dholi, Dr RPCAU, Pusa, Bihar (India). To investigate the genetic diversity based on morphological characters, data was recorded on eighteen quantitative traits. The calculated data was analyzed through two complementary methods, i.e. PCA (Principal Component Analysis) and cluster analysis. Among all the studied cultivars, significant diversity as well as analysis of dispersion was recorded for different agro-morphological characters. Among all the parameters, maximum variance was recorded forseed yield per plant, biological yield per plant, test weight, harvest index and siliqua on primary branches, secondary branches as well as on primary mother axis. Among all the characters, seed yield had significant and positive association with physiological maturity (1.12G & 0.43P), number of secondary branches (1.00G & 0.78P), silique on secondary branches (0.96G & 0.57P), number of primary branches (0.95G & 0.67) and biological yield per plant (0.90G & 0.81P), plant height (0.74G & 0.46P), silique on primary mother axis (0.73G & 0.49P), silique on primary branches (0.72G & 0.53P), length of primary mother axis (0.52G & 0.29P) at genotypic and phenotypic level. Using cluster analysis all the genotypes were divided into five major groups. It was observed that out 8 of 18principal components with an Eigen value of ≥1.0 calculated for 89.17%% of the total diversity observed between twenty accessions of Indian mustard (B. juncea L.). The contribution of first three PCs in the total PCs was 31.94, 47.29 and 60.00 respectively. Among all the investigated clusters, cluster I and cluster IV showed greatpotential for plant height, number of primary branches, number of secondary branches, siliqua on primary branches, siliqua on secondary branches, siliqua on primary mother axis, biological yield/plant and seed yield/plant respectively, so these genotypes are recommended for future breeding programs for achieving promising results.

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