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Asian Journal of Plant Sciences
Year: 2009  |  Volume: 8  |  Issue: 6  |  Page No.: 417 - 424

Gene Effects of Sugar Compositions in Waxy Corn

S. Simla, K. Lertrat and B. Suriharn    

Abstract: To supplement the selection for qualitative traits, the quantitative study by generation means analysis was carried out. The aim of this study was to determine gene effects for sugar contents (sucrose, glucose, fructose and total sugar) in two waxy corns crosses (101sux101bt and 101sux216sh2-crosses). Three inbred lines (101su, 101bt and 216sh2) homozygous in waxy gene were used as parents to generate six basic populations (P1, P2, F1, F2, BC11 and BC12). Eleven entries were planted in a randomized complete block design with three replications. The sugar contents were evaluated en masse from immature kernels at 21 days after pollination. The data were used in generation means analysis to understand gene effects. Dominance and epistatic gene effects explained most of genetic variation for sucrose and total sugar in both crosses. Negative dominance gene effect indicated that sugar content in the F1 hybrids were not as high as that of their parents. Significant additive gene effect also indicated the synergistic effect of the sweet gene combinations. Based on the results, backcross or three-way cross is the best choice to increase sweetness in waxy corn and the use of gene combinations is better than single gene. This information is useful for planning breeding strategies for improving sweetness in waxy corn.

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