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Asian Journal of Plant Sciences
Year: 2005  |  Volume: 4  |  Issue: 6  |  Page No.: 667 - 672

Gene Effects for Specific Leaf Area and Harvest Index in Peanut (Arachis hypogaea L.)

B. Suriharn, A. Patanothai and S. Jogloy    

Abstract: Breeding for drought resistance in peanut (Arachis hypogaea L.) has been done primarily based on empirical selection for yield under drought stress conditions, but progress has been slow. Selection for physiological traits that can contribute to superior performance of the crop under drought stress conditions may complement conventional approach and hasten the progress. Specific leaf area (SLA) and Harvest index (HI) are physiological traits that could be used for this purpose. For the choice of an efficient breeding procedure, a good knowledge on the types of gene action controlling the expression of these two traits is needed. This study was conducted to examine the various gene effects for SLA and HI in three crosses of peanut (ICGV 86388 x IC 10, ICGV 86388 x KK 60-1 and IC 10 x KK 60-1). Seven generations of individual crosses (parents, F1, F2, F3, BC11S and BC12S) were grown in a group balance block experiment with six replications. Data were analyzed following a generation means analysis. The results showed that additive gene effects were predominant in determining the expression of SLA and HI in all the three crosses, accounting for 80-95% of total genetic variability for SLA and 63-73% for HI. Dominant gene effect for SLA was significant in one cross but its contribution was very small. Significant additive x dominant epistatic effects were also observed for SLA in all crosses, but additive x additive and dominant x dominant gene effects were significant in one cross each. Significant epistatic gene effects for HI were also detected in two crosses but largely being additively x additive which is fixable. The predominance of additive gene effects for SLA and HI suggested that selection for the two traits in these crosses would be effective even in early segregating generations.

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