To evaluate the heterosis of rice starch viscosity properties, 30 hybrid combinations were obtained from incomplete diallel cross between six sterile lines and five restorer lines of indica hybrid rice cultivars. The rapid viscosity analyzer (RVA) profile parameters of starch viscosity in hybrid combinations and parents were measured and statistically analyzed. Results showed that there were highly significant genetic differences for RVA properties among the hybrid rice combinations. The starch viscosity properties in hybrid rice combinations were highly significantly affected by gene additive effects and nonadditive effects, majorly affected by parent gene additive effects. The specific combining ability (SCA) of offspring hybrid rice combination was not always high, though the parents have high general combining ability (GCA). The proportion of female parent GCA variance was far bigger than both the proportion of male parent GCA variance and proportion of combinations SCA variance, indicating that the starch viscosity properties in hybrid rice combinations were mainly affected by the sterile lines. There were not only highly significant positive correlations between the competitive advantages of the hybrid rice combinations and female parents′ GCA but also higher determination coefficients, suggesting that the hybrid combinations from female parents with higher GCA have higher competitive advantages. We also found that highly significant over highparent heterosis in peak viscosity, highly significant negative below lowparent heterosis in pasting temperature and highly significant positive over midpatent heterosis in other starch viscosity characteristics.
LIU Hongmei, LIU Jianfeng*, FAN Fengfeng, QIU Yingbo, XU Qingguo
. Heterotic and Combining Ability Analyses of Starch Viscosity Properties in Hybrid Rice[J]. Chinese Journal OF Rice Science, 2013
, 27(2)
: 203
-208
.
DOI: 10.3969/j.issn.10017216.2013.02.014
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