Registration of wheat lines carrying the partial stripe rust resistance gene without the high grain protein content allele.

While the high-temperature adult plant resistance gene represents a promising source of quantitative and potentially race non-specific resistance to wheat stripe rust (causal organism Westend. f. sp. ), its tight linkage (0.3 cM) with the high-grain protein content gene may hinder its introgression in certain cases, such as in soft wheat varieties requiring low grain protein content or in lines where the allele may be associated with a yield penalty. The development and registration of two donor lines, one tetraploid ( L. ssp. ; PI 656793) and one hexaploid ( L. ssp. ; PI 664549), each carrying the resistant wild emmer ( ssp. ) allele for linked with the non-functional 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 4,500 F durum plants (cv. Langdon background) used to fine map . One of the critical recombination events was selected for fixation by self-pollination and transferred to a California adapted spring hexaploid background (breeding line UC1110) through five generations of backcrossing. Genotypic and phenotypic data confirm the presence of and the non-functional allele in both registered lines.