| 【Objective】The study was to investigate the genetic characteristics of quality traits in Xikehui rice.
【Method】Taking Xikehui 2928, Xikehui 4761, Shuhui 498, Yahui 2115 as male parents, and Gang 46A, Nei 5A, Yixiang
2115 as female parents, 20（4 × 5）hybrid combinations were generated by incomplete diallel cross method, and amylose
content, protein content and RVA profile properties of these hybrid combinations were determined. 【Result】（1）The
variation coefficients of amylose content, setback value, breakdown value and consistence value of the tested combinations
were relatively big, which were 61.26%, 51.28%, 36.53% and 21.07% respectively, indicating a great improvement potential
for these traits.（2）The parents of Xikehui 2928, Xikehui 4761, Yixiang 1A and Nei 5A had preferable general combining
ability and could be selected to produce hybrid rice combinations with good quality traits. For example, the amylose
content of the hybrid combination “Nei 5A×Xikehui 2928” was 21.63%, and the protein content was 11.15%.（3）
The extremely significant differences in inter-cross variance and variance of special combining ability indicated that the
quality traits were not only affected by the genetic additive effects of the parents, but also restricted by environmental factors.
（4）The analysis on variance contribution rate of each trait genotype showed that, the amylose content, protein content,
gelatinization temperature, hot paste viscosity, cold paste viscosity and consistence value were significantly affected by the additive effect of parental genes, while the peak viscosity, breakdown value and setback value were significantly affected by the
environmental factors.【Conclusion】When selecting and breeding hybrid rice combinations with good quality, we should not
only select excellent parents for mating, but also take into account the influence of local environment. |
