Submitted to: Germplasm Release
Publication Type: Germplasm Release
Publication Acceptance Date: 7/28/2003
Publication Date: 8/8/2003
Citation: Smith, J.R., Park, S.J., Miklas, P.N., Canaday, C.H. 2003. Release of inter-racial dry bean germplasm line tars-pt03-1 with yield potential and resistance to soil pathogenic fungi and common bacterial blight. USDA-ARS Germplasm Release Notice, p. 2. Interpretive Summary: Pinto bean is the most important dry edible market class in the US in terms of amount of acreage grown (~800,000) and farm gate value ($240 million). Yield potential could be increased if better disease resistance to soil pathogenic fungi and bacterial blight were available. The USDA-ARS and Tennessee Agricultural Experiment Station released a new pinto bean germplasm with new genetic resistance to root rot and bacterial disease. The new genetic resistance was obtained naturally from interspecific hybridization with related bean species. This germplasm will help breeders to develop new pinto bean cultivars with greater yield potential, which will translate into better profit margins for growers.
Technical Abstract: TARS-PT03-1 (previously tested as 98041-13-2-2-2) is an F 5:8 bulk from the cross TARS VCI-4B//Montcalm/MUS PM-31 (an inter-racial hybridization also containing Phaseolus coccineus ancestry). TARS VCI-4B is a small-seeded, tropically adapted pinto bean line derived from a cross between P. vulgaris and P. coccineus. It has resistance to common bacterial blight (CBB) (Xanthosomas campestris pv. phaseoli) and Rhizoctonia solani, but no known resistance to Fusarium solani and Phythium sp. Montcalm is a dark red kidney cultivar with intermediate resistance to CBB, susceptibility to F. solani and R. solani, and no known resistance to P. spp. MUS PM-31 is a small-seeded, red-mottled, tropically adapted germplasm line that was selected for resistance to web blight caused by Thanatephorus cucumeris, the sexual stage of R. solani. It is susceptible to CBB, has an intermediate reaction to R. solani, and no known resistance to F. solani or P. spp. MUS PM-31 is of Middle American descent, whereas Montcalm is of Andean descent. Hence, TARS-PT03-1 has genes from two Phaseolus species and both germplasm pools within P. vulgaris.