ARS | Publication request: PM34, A NEW POWDERY MILDEW RESISTANCE GENE TRANSFERRED FROM AEGILOPS TAUSCHII COSS. INTO COMMON WHEAT (TRITICUM AESTIVUM L.)

Submitted to: Theoretical and Applied Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: June 1, 2006
Publication Date: September 1, 2006
Citation: Miranda, L.M., Murphy, J.P., Marshall, D.S., Leath, S. 2006. Pm34, a new powdery mildew resistance gene transferred from aegilops tauschii coss. into common wheat (triticum aestivum l.). Theoretical and Applied Genetics. 113:1497-1504.

Interpretive Summary: Powdery mildew is a fungal disease that limits yield in wheat grown in the eastern and southeastern United States. This research identifies a new gene for powdery mildew resistance in wheat, transferred from a wild relative of cultivated wheat.

Technical Abstract: A novel source of resistance to wheat powdery mildew present in the germplasm line NC97BGTD7 was genetically characterized as a monogenic trait in greenhouse and field trials using F2 derived lines from a NC97BGTD7 X Saluda cross. Microsatellite markers were used to map and tag this resistance gene. Three co-dominant microsatellite markers linked to the NC97BGTD7 powdery mildew resistance were identified and their most likely order was established as: Xbarc177-5D, 5.4cM, resistance gene, 2.6cM, Xbarc144-5D, 14cM, Xgwm272-5D. These microsatellite markers were previously mapped to the long arm of the 5D chromosome and their positions were confirmed using Chinese Spring Nullitetrasomic Nulli5D-tetra5A and ditelosomic Dt5DL lines. Pm2, the only other known Pm gene on chromosome 5D has been mapped to the short arm and specificity is different from that of NC97BGTD7. This new gene has been named Pm34.