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Title: PROGRESS IN INTROGRESSING WHITE MOLD RESISTANCE FROM THE SECONDARY GENE POOL OF DRY BEAN

Author
item TERAN, HENRY - UNIV OF IDAHO
item SINGH, SHREE - UNIV OF IDAHO
item SCHWARTZ, HOWARD - COLORADO STATE UNIV
item OTTO, KRISTINE - COLORADO STATE UNIV
item Miklas, Phillip - Phil

Submitted to: Bean Improvement Cooperative Annual Report
Publication Type: Research Notes
Publication Acceptance Date: 3/10/2005
Publication Date: 5/1/2005
Citation: Teran, H., Singh, S.P., Schwartz, H.F., Otto, K., Miklas, P.N. 2005. Progress in introgressing white mold resistance from the secondary gene pool of dry bean. Bean Improvement Cooperative Annual Report. 48:126-127.

Interpretive Summary:

Technical Abstract: Only low levels of white mold resistance occur in common bean. In contrast, Phaseolus species in the secondary gene pool possess high levels of resistance that must be introgressed and pyramided into dry bean cultivars for effective control of white mold. Our long-term objectives are to introgress and pyramid high levels of white mold resistance from across Phaseolus species into dry bean cultivars. In this article, we shall briefly describe the progress achieved thus far in introgressing white mold resistance from the three Phaseolus species in the secondary gene pool. A total of 482 interspecific breeding lines from eight of ten populations between dry bean ‘ICA Pijao’ and Phaseolus coccineus produced seed in Idaho in 2002. These interspecific breeding lines were introduced from CIAT, Cali, Colombia. Based on both field and greenhouse tests, 129 of 482 most promising breeding lines were again screened in the greenhouse in Idaho (using the petiole test) and Colorado (using the straw test) in 2004. Also, a much smaller set of breeding lines was screened in the field at Paterson, Washington in 2004. The Washington nursery had heavy disease pressure that permitted identification of a few breeding lines with moderate to high levels of white mold resistance in the field as well as in the greenhouse. This project is also involved in determining the inheritance of white mold resistance in P. coccineus accessions PI 433246 and PI 439534; (2) tagging and mapping resistance genes and QTL, (3) introgressing resistance from new interspecific populations, (4) pyramiding white mold resistance, and (5) transferring resistance into pinto bean.