Clustering of genetic parameters of embryo characters and taxa of tetraploid wheat
Abstract
Methods of numerical taxonomy were applied for classification of genetic parameters m, [d], [h], [i], [j], [l] as well as for cluster analysis of hybrid taxa of tetraploid wheats. Clustering of objects was made at the level of cophenetic correlation > 0.90. Transformations of scale did not improve distinctly the efficacy of the used methods. The parameters m are set in a separate cluster. Distribution of parameters within the 3D-space shows special genetic nature of epiblast. Relationships within pairs of genetic parameters, i.e. [h]–[i] and [d]–[l] show that overdominance and non-allelic overinteractions control the expression of embryo characters. Presentation of taxa within a space of minimum-length spanning tree exhibits separation of reciprocal hybrid pairs in two groups of the maternal-paternal Triticum carthlicum origin. Neighbour-joining dendrogram sets apart a group of hybrids of T. carthlicum and T. dicoccoides origin. This is an evidence of genetic peculiarity of endemic Persian wheat as well as wild emmer within group of tetraploids studied.
Keywords:
embryo, numerical taxonomy, parameters of quantitative genetics, wheat tetraploidsReferences
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