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Transfer of high kernel weight and high protein from wild tetra ploid wheat triticum turgidum dicoccoides to bread wheat triticum aestivum using homologous and homoeologous recombination



Transfer of high kernel weight and high protein from wild tetra ploid wheat triticum turgidum dicoccoides to bread wheat triticum aestivum using homologous and homoeologous recombination



Euphytica 33(1): 249-256



Wheat pentaploids were produced by hybridizing a high kernel weight (1000 grain wt = 56 g), high protein (25.4%) line of wild tetraploid wheat as male parent, with the 3 hexaploids-normal 'Chinese Spring' and its 2 homoeologous pairing mutants, ph1b and ph2. The pentaploids were crossed as female parents to the 2 commercial hexaploid cv. Warigal and Barkaee and 42-chromosome stable plants selected from the F1 of the pentaploid .times. hexaploid crosses. Mean protein content of certain F3 lines from all 6 pentaploid .times. hexaploid crosses was significantly higher than Chinese Spring and the respective commercial hexaploid parent (P < 0.005) indicating high protein was transferred from the tetraploid to the hexaploid level. Kernel weight among certain F3 lines of the 3 pentaploids .times. Barkaee was significantly (P < 0.0005) higher than either Chinese Spring or Barkaee, indicating the transfer also of high kernel weight from the tetraploid to the hexaploid level. Kernel weight was not significantly increased over Warigal in any F3 lines of its crosses with the 3 pentaploids. High levels of homoeologous chromosome pairing in the ph-mutant pentaploids, plus evidence for significant modification of the composition of high-MW (HMW) glutenin subunits of grain protein in certain F3 derivatives of the ph-mutant pentaploid .times. hexaploid, crosses indicates that the ph-mutant-derived lines may possess novel (intergenome) genetic recombination, at least for high protein, and possibly kernel weight.

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