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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 638738 | Yecora Rojo Lr47 | Triticum aestivum L. subsp. aestivum | California, United States | NSGC |  | | 2005 | DEVELOPED | | | | | | Genetic material | Yecora Rojo isogenic line for Lr47. BC6F4 homozygous line for leaf rust resistance gene Lr47 (from PI 603918). The T.speltoides 7S chromosome segment carrying Lr47 is located 2-10 cM from the centromere and is 20-30 cM long. The chromosome segment was selected during the 6 backcrosses using molecular markers. Yecora Rojo isogenic lines with and without Lr47 were compared in field trials at Kings, California in 2003 and at Kings and Davis, California in 2004. The isogenic lines with and without the gene showed similar agronomic characteristics including height and heading time. Depending on the environment some of the plants carrying the Lr47 chromosome segment showed purple stems. No significant differences in yield were observed between the isogenic lines grown at Kings. However, at Davis under strong stripe rust infection pressure, the lines carrying Lr47 showed a 10% increase in stripe rust infections which resulted in a significant decrease in yield. These results suggest that the 7S chromosome segment has probably replaced a gene located in the 7A chromosomes of Yecora Rojo that has a small positive effect on resistance to stripe rust races present in these locations. Analysis of the isogenic lines for grain protein content showed a significant increase (average 0.6%) associated with the presence of the Lr47 chromosome segment in the tested locations. [See PI 638738-638742 for accessions from the same Crop Science registration.] | 1673392 | PI 638738 |
| 1 | PI 638739 | Kern Lr47 | Triticum aestivum L. subsp. aestivum | California, United States | NSGC |  | | 2005 | DEVELOPED | | | | | | Genetic material | Kern isogenic line for Lr47. BC6F3 homozygous line for leaf rust resistance gene Lr47 (from PI 603918). The T.speltoides 7S chromosome segment carrying Lr47 is located 2-10 cM from the centromere and is 20-30 cM long. The chromosome segment was selected during the 6 backcrosses using molecular markers. Kern isogenic lines with and without Lr47 were compared in field trials at Kings, California in 2003 and at Kings and Davis, California in 2004. The isogenic lines with and without the gene showed similar agronomic characteristics including height and heading time. Depending on the environment some of the plants carrying the Lr47 chromosome segment showed purple stems. No significant differences in yield were observed between the isogenic lines grown at Kings. However, at Davis under strong stripe rust infection pressure, the lines carrying Lr47 showed a 18% increase in stripe rust infections which resulted in a significant decrease in yield. These results suggest that the 7S chromosome segment has probably replaced a gene located in the 7A chromosomes of Kern that has a small positive effect on resistance to stripe rust races present in these locations. Analysis of the isogenic lines for grain protein content showed a significant increase (average 0.4%) associated with the presence of the Lr47 chromosome segment in the tested locations. [See PI 638738-638742 for accessions from the same Crop Science registratio.] | 1673393 | PI 638739 |