Colchicine – Induced Genetic Variations in M2 and M3 Generations of Cowpea (Vigna unguiculata L. Walp)

AJAYI A. T., A.F. OLOGUNDUDU, V. O. AZUH, O. F DARAMOLA, A. R. KAJOGBOLA

Abstract


Effect of 0.1% aqueous colchicine solution at 0hr, 2hrs, 4hrs and 6hrs duration of exposure (treatments) were evaluated for quantitative and yield traits of a cowpea variety, “Oloyin” in M2 and M3 generations. Treatment effect was significant (P ≤ 0.05) for all traits in M2 and M3. Values for some quantitative traits (plant height, number of branches, number of nodes, and number of leaves) increased as treatment duration increased in M2 generation, while reverse is the case in M3 generation except for the number of branches. Flowering was early in 4hrs in M2, while in M3 generation, 6hrs produced flower first. For yield traits, number of pods per plant reduced as treatment increased in both generations, seeds per plant followed an irregular pattern in M2, while it reduced as treatment duration increased in M3 generation. Seed weight also followed irregular patterns in both generations; while 4hrs duration of treatment maintained the highest seed weight in both generations, an improvement in yield that is consistent. Genotypic Coefficient of Variation (GCV) and Phenotypic Coefficient of Variation (PCV) were very high for most quantitative and yield traits, and generally decreased as treatment duration increased in M3. High heritability and Genetic Advance as percent of Mean were also observed in M3 generation for almost all traits; though they also decreased as treatment duration increased. Based on the high GCV, heritability and GAM experienced in the present study for yield and yield contributing traits, selection can be done and exploited for the improvement of cowpea.

Keywords


Cowpea, colchicine, heritability, genetic advance as percent of mean, genotypic coefficient of variation

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