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Title

AN ESTIMATION OF COMBINING ABILITY AND GENE EFFECTS OF DIFFERENT TRAITS IN RICE THROUGH DIALLEL CROSS

Pages

 Start Page 161 | End Page 171

Abstract

 Five RICE genotypes (Hasseni, Dailamani, Shastak-mohammadi, Sange-tarom and Daei-shastak) and their 10 hybrids obtained through half diallel set were evaluated for COMBINING ABILITY and gene effects for some RICE traits. Single seedlings of each entries were transplanted at 20×20 cm spacing in 3×5 m2 plots in a randomized block design of three replications during 2004-2005 at the Research Station of the College of Agriculture, University of Mazandaran. General COMBINING ABILITY (GCA) and specific COMBINING ABILITY (SCA) were assessed for all the agronomic traits. The results indicated significant differences between general (GCA) and specific COMBINING ABILITY (SCA) for the investigated characteristics. This indicates the role of additive and non-additive gene effects in inheritance of the traits. Variances due to GCA were greater than those due to SCA for plant height, flag leaf width, number of primary panicles, total grain and number of fertile grain per panicle, suggesting the role of additive gene effects as predominant in inheritance of the traits. These characteristics are of high heritability the selection for which may well succeed. But, low heritability of tiller number, date to 50% flowering, flag leaf length, panicle length, seed width, 1000-grain weight and plant characteristics, were emanated from a high degree of non-additive variance in the genetic variance. Thus these characteristics were suggested as important for production of hybrid variety and exploitation of heterosis. The GCA effects of each parent for the named traits showed that the Daei-shastak is a suitable general combiner for yield.

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