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Transfer of high kernel weight and high protein from wild tetraploid wheat (Triticum turgidum dicoccoides) to bread wheat (T. aestivum) using homologous and homoeologous recombination
Wheat pentaploids were produced by hybridizing a high kernel weight (1,000 grain wt = 56 g), high protein (25.4%) line of wild tetraploid wheat (Triticum turgidum dicoccoides ) as male parent, with the three hexaploids (T. aestivum )--normal Chinese Spring and its two homoeologous pairing mutants, ph sub(1b) and ph sub(2). The pentaploids were crossed as female parents to the two commercial hexaploid cultivars Warigal and Barkaee and 42-chromosome stable plants selected from the F sub(1) of the pentaploid x hexaploid crosses. High levels of homoeologous chromosome pairing in the ph-mutant pentaploids, plus evidence for significant modification of the composition of high-molecular weight (HMW) glutenin subunits of grain protein in certain F sub(3) derivatives of the ph-mutant pentaploid x hexaploid, crosses indicates that the ph-mutant-derived lines may possess novel (intergenome) genetic recombination, at least for high protein, and possibly kernel weight.