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Variable Production of Tetraploid and Hexaploid Progeny Lines from Spring Wheat by Durum Wheat Crosses

Plant Sciences and Plant Pathology Dep., Montana State Univ., Bozeman, MT 59717

^* Corresponding author (usslt{at}montana.edu).

Hexaploid spring wheat (Triticum aestivum ssp. aestivum) and tetraploid durum wheat (Triticum turgidum ssp. durum) are both widely grown in the Great Plains of North America. Transfer of genes between classes may be beneficial to improvement efforts. However, ploidy level differences lead to variable degrees of sterility in crosses between the two classes. Our aim was to quantify variation among a set of spring wheat genotypes for production of viable euploid progeny after crosses with durum wheat. Hexaploid spring wheat parents varied for their ability to produce viable F₅ progeny, with attrition occurring at all stages of the inbreeding process. Polymerase chain reaction primers specific for the seven D chromosomes indicated that most lines derived from spring wheat by durum wheat crosses were euploid, with a preponderance of tetraploid progeny lines for most parents. Our results showed variability among hexaploid genotypes for their ability to produce viable progeny and suggested that ‘Choteau’ hard red spring wheat may be a good bridge variety for interploidy crosses.

Abbreviations: PCR, polymerase chain reaction • SNP, single-nucleotide polymorphism

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Received for publication June 16, 2007.