| In this paper, the combining ability and heritability of starch properties and the parent-offspring correlation in different waxy wheat gene type as well as the relationship between waxy protein contents and wheat quality were studied. The correlation among noodle scores and starch properties in common wheat were analyzed too. The main results were as follows:The combining ability and hereditability of starch properties starch properties were derived from a NCⅡincomplete diallel cross involving six different waxy protein deficiencies (nine crosses). The results indicated that the variation of GCA and SCA for amylose contents, amylose /amylopectin ratio, starch contents were both highly significant, and the variation of female parents was larger than that of male parents. Amylose contents, amylose /amylopectin ratio, starch contents were controlled mainly by non-additive genes. Amylopectin contents was controlled by additive genes. Amylose/ amylopecitn ratio was effected hardly by environmental genes. Swelling power was controlled by both additive and non -additive genes, but the effects of non-additive genes were more important than that of additive genes. The total heritability was higher than that of other traits. The effect of environmental genes on swelling power can't be ignored. Peak viscosity, trough viscosity, final viscosity setback and peak time were controlled by additive genes, whilebreakdown, pasting were controlled by non-additive genes. Peak viscosity, pasting and pasting time were controlled by female cytoplasmid genes and male, female mucleus genes. Peak time,pasting temperature, pasting and pasting time were controlled by endospermic genes. Peak time and pasting time were not sensitive to environment.Evaluation of the parent-offspring correlation of starch traits in 4 F1 crosses and regularity of distribution of starch traits in the progenies of F2single plant were derived .The GCA, SCA of parents and the Mid-parent of amylose contents were useful for evaluation of the performance of F1 crosses. The GCA,SCA and the means of amylose contents of F1 crosses that could be used to predict the overall level of amylose contents in F2 separating population. For amylopectin, the GCA and SCA of parents were highly correlated with the mean of F1 crosses .The starch contents of the offspring was controlled by female cytoplasmic genes. As for swelling power, MP, female and GCA were used to appreciate the F1 crosses. The starch properties of F2 single plant in 4 different crosses showed continuous distribution, but the regularity of distribution were different. The frequency distribution for amylose and amylopectin contents of cross 1,2 and 4 were found positive deviation distribution. The frequency distribution for amylose contents of cross 3 was found positive deviation distribution too, while that for amylopectin was found negative deviation distribution. The frequency distribution for starch contents and swelling power had much differences and that for starch viscosity were much complex and were mainly deviation distribution.The amylose content of F1 seeds was different from the waxy wheat and non-waxy wheat. The amyose content of nonwaxy×waxy type was higher than that of waxy×nonwaxy type. The significant correlation was found between the amylose content and falling number, swelling power was found negatively related to amylose content. It was showed that the peak viscosity of F1 seeds was much lower than that of non-waxy wheat. The starch properties of reciprocal hybrids and the parents of different waxy deficiencies were discussed. The waxywheat had a special viscosity curves and lower peak viscosity, this phenomenon was related to the gelatinization of the waxy starch. The low gelatinization of the waxy starch were caused by the low amylose content .The variation in amylose content was related to deficiency or mutation of waxy proteins.The correlation among noodle score and starch properties of 50 common wheat varieties were analyzed. Amylose/amylopectin ratio was h... |
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