Vol. 11, Issue 9 (2022)

Author(s):
Sateesh Babu J and MV Ramana

Abstract:
An investigation was conducted to study the extent of heterosis over mid parent (Average heterosis), better parent (heterobeltiosis), as well as inbreeding depression in F₂ generation. A total of eight genotypes were used to generate ten crosses viz., LBG 20 x P 1070 (Cross I), LBG 20 x P 1053 (Cross II), LBG 752 x P 1053 (Cross III), LBG 752 x P 1070 (Cross IV), LBG 752 x TU94-2 (Cross V), MBG 207 x PU 31 (Cross VI), MBG 207 x P1053 (Cross VII), TBG 104 x P 1070 (Cross VIII), TBG 104 x PU 31 (Cross IX) and TU 68 x P 1053 (Cross X). Desirable heterosis for days to 50% flowering, days to maturity, MYMV incidence (negative) and seed yield per plant (positive) was recorded in the crosses LBG 20 x P 1070 and LBG 752 x P 1070 while most of the crosses showed inbreeding depression. The crosses, LBG 20 x P 1070 and LBG 20 x P 1053, recorded significant positive heterobeltiosis and significant negative inbreeding depression i.e., less inbreeding depression for the characters viz., number of clusters per plant, number of pods per plant, leaf area and seed yield per plant. This kind of expression suggests the involvement of additive gene action in the inheritance of these traits. Therefore, the segregating material generated during the study may be utilized in identification and selection of desirable recombinants in later generations in order to develop high yielding varieties coupled with resistance to MYMV.