Implication of combining ability analysis in tobacco breeding
1998
Ejaz-ul-Hassan, S. (Tobacco Research Station, Sahiwal (Pakistan)) | Butt, M.A. | Qureshi, A.A.
A diallel cross (excluding reciprocals) involving four tobacco cultivars viz; SL-36, SL-49, SL-78 & SL-81 was studied for plant height, number of leaves per plant, leaf size alongwith thickness and cured leaf yield, spaced at 30 cm between plants and 75 cm between rows in RCBD with three replications. The mean squares from the analysis of variance indicated highly significant (P-0.01) differences among genotypes for leaf size whereas, significant (P less than greater than 0.05) differences were noted for plant height and number of leaves per plant. The general combining ability (GCA) estimates were highly significant for number of leaves per plant and leaf size whereas, significant for all the other parameters except cured leaf yield. However, the estimates of specific combining ability (SCA) were non-significant for all the agronomic plant traits under study. The magnitudes of general combining ability estimates were higher than specific combining ability estimates for all plant characteristics, indicating predominance of additive gene Action. The cultivar (SL-81) with encouraging GCA & SCA effects coupled with mean performance, is recommended for further breeding programmes.
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