Induction of Genetic Variability in a Disease-resistant Groundnut Breeding Line
نویسنده
چکیده
Due to narrow genetic base of groundnut (Arachis hypogaea L.), induction of genetic variability was undertaken by treating seeds of TFDRG 5 with 200 and 300 Gy of gamma rays and with 1, 2 and 3 mM of sodium azide (NaN 3 ) singly and in combination. The combination of 200 Gy and 3 mM of NaN 3 induced maximum number of mutants with a frequency of 2.48% in M 2 generation. In all, 63 true breeding mutants were induced, affecting various morphological traits. Among them, the fused terminal leaflet was unique. In newly formed leaves of disease lesion mimic mutant, catalase activity was reduced as compared to the parent. In large seed mutants, seed size ranged from 52 to 69g/100 seeds as compared to 45g in parent, with 15 to 53% superiority along with resistance to rust. Dominant rose testa mutants were also induced. Cluster analysis revealed considerable genetic variability, among induced mutants.
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