Evaluation of shootfly resistance traits in rabi sorghum (Sorghum bicolor L. Moench)
2013
Lad, D. B. | Patil, J. V. | Karande, S.P. | Sonawane, C. J.
The present investigation was undertaken to estimates the nature and magnitude of gene actions involved in controlling the traits imparting shootfly tolerance in rabi sorghum. The investigation comprised of nine generations (P₁, P₂, F₁, F₂, B₁, B₂, F₃, B₁ F₂, and B₂ F₂) of four crosses. The dominance gene action and additive x additive interaction were found predominant for trichome density. Dominance x dominance (l) and additive x additive (i) interaction effects, along with epistasis made significant contribution for per cent dead heart. Grain yield was under the control of both additive as well as dominance gene action along with preponderance of additive x additive (i) and dominance x dominance (l) interaction effects, which indicated that exploitation of heterosis as well as simple selection will be effective for the improvement. Duplicate epistasis was observed in all the crosses for shootfly tolerance. On the basis of results obtained from the present investigation, the cross SPV1546 x RSV458 is expected to be the most promising among all the four crosses, while parent RSV 458 and RSE-3 exhibited superior average performance, individually and in cross combinations and parent SPV1546 also showed better performance for trichome density, per cent dead heart and grain yield.
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