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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
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| 0 | PI 638742 | Anza Lr37 Yr17 Sr38 | Triticum aestivum L. subsp. aestivum | California, United States | NSGC |  | | 2005 | DEVELOPED | | | | | | Genetic material | Anza isogenic line for a 2NS/2AS translocation carrying rust resistance genes Lr37/Yr17/Sr38. BC6F4 homozygous line for the rust resistance genes transferred into HRS recurrent parent Anza. The Lr37 (leaf rust resistance), Yr17 (stripe rust resistance), and Sr38 (stem rust resistance) were initially introgressed in the winter bread wheat VPM1 from T.ventricosum. Rust races with virulence to Yr17 and Lr37 have been identified in some countries, but this gene cluster still provides resistance to a wide range of races and is useful in combination with other resistance genes. The 2NS/2AS translocation replaced approximately half of the short arm of chromosome 2A. Molecular markers for this segment were used to introgress these resistance genes into Anza using 6 backcrosses. Isogenic lines with and without the gene were tested in field trials at Davis and Kings, California in 2004 under severe stripe rust infection pressure. The isogenic lines were morphologically similar and showed no significant differences in flower time and height. The presence of Yr17 significantly reduced the severity of stripe rust infection (61% reduction in severity). The recurrent parent Anza has the slow rusting complex Lr34/Yr18 suggesting that the addition of Yr17 increases the resistance to stripe rust provided by Yr18. The improved resistance of the Yr17 isogenic lines resulted in significant increases in yield in both locations (average 663 kg/ha). The molecular and field data confirmed that the 2NS chromosome segment including the Lr37/Yr17/Sr38 resistance genes was successfully transferred to Anza. [See PI 638738-638742 for accessions from the same Crop Science registration.] | 1673396 | PI 638742 |