Author(s):

Sukhpreet Kaur Sidhu and Jagmeet Kaur

Abstract: The present investigation was undertaken to study the genetic diversity, correlation and path coefficient analysis for 16 metric traits in 43 pigeonpea genotypes at Department of Plant Breeding and Genetics in the Punjab Agricultural University, Ludhiana during Kharif 2013. Pigeonpea genotypes were grown in pots and two phosphorus doses were supplied to soil in the pots; one was recommended dose of phosphorus supplied [Single Super Phosphate@ 250 kg/ha^-1 nutrient (+P)] and in second, P fertilizer was not added in soil (-P). Within clusters sum of squares were maximum in cluster I. This cluster showed highest average values of root area and perimeter was highest of this cluster than other four clusters under recommended dose of P. Root perimeter was highly positively correlated with root area and a negative correlation was found among leaf P and root length, root P and root length, root P and root dry weight, stem P and root dry weight, stem P and root area, leaf P and root area. Path analysis of leaf P indicated that root dry weight had maximum significant positive direct effect followed by root volume, leaf area on leaf P. Genetic diversity, correlation coefficient and path analysis approaches may be used in selecting traits which contribute for phosphorus use efficiency from large pool of germplasm for breeding purpose.

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