Vol. 9, Issue 10 (2020)

Author(s):
NS Rathod, Dr. VL Gawande and Sangeeta U Fatak

Abstract:
Line x Tester analysis involving two females (CMS lines) and twenty males of safflower yielding forty hybrids was conducted to estimate the magnitude of heterosis, heterobeltiosis and standard heterosis over three checks viz., PKV PINK, PBNS 12 and CO 1 for the biochemical traits associated with aphid tolerance and seed yield (under aphid infestation). There was substantial genetic variability present in the genotypes studied for seed yield and other biochemical traits associated with aphid tolerance. Considerable range of variability for heterosis over mid parent, better parent and standard check was observed for aphid infestation index (A.I.I.), phenol content and seed yield as compared to chlorophyll content. Further, the female parent AKS CMS 2A performed well in combination with male parents for all the traits as compared to AKS CMS 3A. The highest, significant heterosis over mid parent, better parent and best check in desirable direction for the trait A.I.I. and chlorophyll content index was observed in cross AKS CMS 2A x AKS/S-33. The highest magnitude of average heterosis, heterobeltiosis and useful heterosis for phenol content was observed in cross AKS CMS 2A x S-518. Further, the highest positive and significant heterosis, heterobeltiosis and standard heterosis in desirable direction were recorded for seed yield per plant (under aphid infestation) by the cross AKS CMS 2A x GMU 3876. Hence, these three crosses viz., AKS CMS 2A X AKS/S-33, AKS CMS 2A X S-518 and AKS CMS 2A X GMU 3876 found to have immense value as far as the traits associated with aphid tolerance is concerned. These crosses may further be tested at various locations to find out best one as aphid tolerant hybrid for commercial cultivation.