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Registration of wheat lines carrying the partial stripe rust resistance gene yr36 without the gpc- b1 allele for high grain protein content

  • Author(s): Dubcovsky, J
  • Hale, I
  • Zhang, X
  • Fu, D
  • et al.

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While the high-temperature adult-plant resistance gene Yr36 represents a promising source of quantitative and potentially race-nonspecific resistance to wheat stripe rust (causal organism Puccinia striiformis Westend. f. sp. tritici), its tight linkage (0.3 cM) with the high grain protein content (GPC) gene Gpc-B1 may hinder its introgression in certain cases, such as in soft wheat varieties requiring low GPC or in lines where the Gpc-B1 allele may be associated with a yield penalty. The development and registration of two donor lines, one tetraploid (Triticum turgidum L. ssp. durum; Reg. No. GP-945, PI 656793) and one hexaploid (T. aestivum L. ssp. aestivum; Reg. No. GP-946, PI 664549), each carrying the resistant wild emmer (T. turgidum ssp. dicoccoides) allele for Yr36 linked with the nonfunctional Gpc-B1 allele, are intended to overcome this potential limitation. Meiotic recombination events breaking the linkage between these two genes were discovered during the systematic screening of a population of 4500 F2durum plants ('Langdon' background) used to fine map Yr36. One of the critical recombination events was selected for fixation by self-pollination and transferred to a California-adapted spring hexaploid background (breeding line UC11105+10) through five generations of backcrossing. Genotypic and phenotypic data confirm the presence of Yr36 and the nonfunctional Gpc-B1 allele in both registered lines. © Crop Science Society of America.

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