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HYBRID VIGOUR IN INTERV ARIETAL CROSSES OF UPLAND COTTON

B.A. ANSARI, M.M. RAJPER, AJ. MALIK AND K.A. ANSARI*

Abstract: Heterosis studies were undertaken in seven intervarietal F₁ hybrids of Gossypium hirsunum L, for number of sympodia, mimber of monopodia, number of bolls, boll weight, ginning outturn percentage, staple length and seed cotton yield. Mean squares revealed that all the hybrids and their parents were significantly (P < 0.01) different for all the characters except boll weight. All the hybrids manifested hybrid vigour over their mid parent values for all the characters under study except monopodia per plant, where four hybrids also exhibited positive heterotic effect. Majority of the hybrids transgressed over their better parent values and all the hybrids showed heterobeltiotic effects for seed cotton yield per plant. The hybird of Qalandari X CIM-109 out yielded the performance than the other crosses, the values being 100.56 and 89.24 % in comparison to their mid and better parent values respectively. TIle results indicate that all the cross combinations could be utilized for getting higher yield as hybrid production.

Department of Plant Breeding & Genetics, Sindh Agriculture University, Tandojam, Pakistan.
Agriculture Research Institute, Tandojam, Pakistan.