| 84 hybrid F1 were produced with 14 thermo photo sensitive genic male sterile wheat lines and 6 restorers by 14×6 incomplete diallel cross, for the purpose of evaluating the combining ability of male sterile lines. The general combining ability (GCA) and special combining ability (SCA) of male sterile lines were investigated on 7 traits. The results showed that the variances of GCA in grains per spike, 1000 grains weight, spike length and spikelet per spike were significant at 0.01 level, suggesting that these four traits were mainly determined by additive effects, while the variances of GCA and SCA in yield per plant, spikes per plant and plant height were both significant at 0.01 level, indicating both additive and non additive effects played important roles for these three traits. Parents with better GCA were generally characterized as having bigger GCA values in yield and yield components, and more yield components with positive GCA value, such as male sterile lines S1, S6, S7, S9, S12, S13 and S14. According to the analysis on SCA effects of yield component from top ten combinations with the highest SCA value for yield component, grains per spike was the most important component for combination with strong heterosis, then the spikes per plant and 1000 grain weight. The result is helpful not only for selecting combination, but also for breeding sterile lines and restorers. Moreover, the phenotypic values of spikelet per spike and plant height of male sterile line, spikes per plant, grains per spike, 1000 grain weight and plant height of restorer, were all positively and significantly correlated with their GCA values, which meant the phenotypic values of these traits could be directly used as a guide to combination selection. |
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