小麦面粉RVA粘度特性的遗传潜势和聚类分析

Genetic Potentials of Wheat Flour RVA Pasting Characteristics and Cluster Analysis

分析了84个小麦品种(系)面粉的RVA特征参数,结果表明:7个RVA粘度性状在不同品种(系)间存在极显著的差异;所有RVA特征值具有较高的广义遗传力;根据全部7个RVA特征参数和仅用高峰粘度、低谷粘度和最终粘度3个指标将84个品种(系)聚类的结果几乎完全相同,结果是不同品种(系)总体上有按不同生态型聚集的趋势,变异系数的大小决定着聚类的结果.南方品种(系)绝大部分聚为一类,这类品种的RVA特征值均较高,但各参数变异较小;绝大部分北方品种(系)和加拿大品种聚为一类,这类品种所有RVA特征值均较低,但变异系数均较大;其它品种(系)聚为一类,其RVA参数为3类中最低,变异系数却为最高,且最终粘度低于或接近高峰粘度.小麦面粉RVA粘度高低的总体表现是:第Ⅰ类(南方为主型)>第Ⅱ类(北方为主型)>第Ⅲ类(特殊型).

Seven RVA(Rapid ViscoAnalyser) parameters of eightyfour wheat varieties(lines)were analyzed, the results showed: different varieties(lines)possessed significantly different RVA paste viscoproperties; all the RVA paste viscoproperties had high broad heretability; eightyfour varieties (lines)were clustered into three characteristically different groups based on seven RVA parameters, which had the similar clustering results if based on only peak viscosity, trough viscosity and final viscosity of them. Those varieties (lines) which had similar ecological origins clustered, that is, the majority of varieties from southern areas gathered, which exhibited higher RVA parameters and lower coefficients of variation, and most of varieties from northern areas and Canada had similar tendency, but they were characteristics of lower RVA parameters and higher coefficients of variation. The rest flocked together, which showed the lowest RVA parameters and highest coefficients of variation, and in this group, final viscosity was higher than or close to peak viscosity. The RVA paste viscoproperties of three different groups had the following tendency: Group Ⅰ (mainly from southern areas)>Group Ⅱ(mainly from northern areas) >Group Ⅲ (special group).