Seed polymorphism in South Indian horsegram (Macrotyloma uniflorum (Lam.) Verdc.): A comprehensive studyLatha M,Suma A,Asha KI,NK Dwivedi,Mani S and Indiradevi A17_pdf.pdf001 -006Seed polymorphism,physiological parameters,correlation,variability,seed physical characters.586174The seeds samples of fifty accessions of horsegram germplasm originating from different states of Southern India were evaluated for seed polymorphism and the effect of seed colour on various physical and physiological attributes were analyzed. The accessions were significantly different for the seed characters studied. The influence of environment on inheritance of these characters was marginal as indicated by a narrow difference between phenotypic and genotypic coefficient of variation. Correlation studies were done in order to analyze the relationship between the seed physical and physiological characters in horsegram accessions. All the physiological attributes showed non-significant correlation with the seed physical characters except for germination percentage which showed highly significant positive correlation with hundred seed weight. Out of 13 seed colour categories noticed, three colours such as light brown, mottled cream, and cream were the most commonly found ones in the population while mottled grayish cream colour was present only in one accession (IC320010). Maximum number for colour polymorphism was exhibited by IC47135, having seeds 9 colour patterns. Minimum number of seed colour categories (2) was noticed in IC68591, IC47137 and IC71793A. Among the seed colours, mottled grey cream and intermediate light brown colour exhibited high values for both seed physical and physiological parameters. Thus for improvement in yield contributing characters, these colours can be given due preference during selection. Latha M, Suma A, Asha KI, NK Dwivedi, Mani S and Indiradevi A. 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