Inheritance of Resistance to Two Races of Leaf Rust in Dry Edible Bean¹

Abstract

A study was conducted to determine the inheritance of resistance to races 44 and 52 of leaf rust (causal organism Uromyces appendiculatus (Pers. ex Pers.) linger var. appendiculatus) in the dry edible bean (Phaseolus vulgaris L.) cultivars ‘T‐39,’ ‘Aurora,’ and ‘Olathe.’ T‐39 and Aurora each express hypersensitive resistance to race 52 but are susceptible to race 44. Olathe is hypersensitive resistant to race 44 and susceptible to race 52. Crosses were made between these cultivars and with ‘UI‐114,’ a pinto bean cultivar susceptible to both races. Resistance of Ft progeny and segregation ratios within F2 populations and among F3 progeny from individual F2 plants of crosses with UI‐114 indicated that resistance to each race was controlled by a single, dominant gene. Segregation ratios of the F2 population and F5 progeny from individual Fj plants of the cross Olathe ✕ T‐39, inoculated with race 44 only, indicated that complementary dominant genes controlled resistance to race 44. Segregation ratios of genes for resistance to races 44 and 52 in progenies of Olathe ✕ Aurora indicated independent assortment without epistasis. The following tentative genotypes for rust reaction of the cultivars studied are proposed: Olathe ‐ UraUraUrcUrcthe cultivars studied are proposed: Olathe ‐ UraUraUrcUrcthe cultivars studied are proposed: Olathe ‐ UraUraUrcUrcurburb; T‐39 ‐ urauraurcurcUrbUrb; Aurora ‐ urauraUrcUrcUrbUrb; UI‐114 ‐ urauraUrcUrcurburb.

75 years of breeding pinto bean for resistance to diseases in the United States

“…Major dominant genes control rust resistance (Grafton et al 1985;Stavely 1990). Pastor-Corrales et al (2001) and Stavely et al (1997) reported pinto been breeding lines that were developed under the leadership of Dr. J.R. Stavely at the USDA-ARS, Beltsville, Maryland through inter-institutional and inter-disciplinary collaborative conversion program whereby highly photoperiod sensitive rust resistant tropical and subtropical germplasm were converted to adaptation to the USA common bean growing environments over several years.…”

Common Bean Rust: Pathology and Control

“…Single dominant 'BelDakMi-RMR-14' -to '-18' Grafton et al 1985;Stavely and Kelly 1996;Kelly et al 1996;Stavely et al 1998Stavely et al , 1999a Ur-6…”

“…< ''6,5'', wide variation 'BelDakMi RR-1,' 'BelDak-RR-2', 'BelNeb-RR-1' Grafton et al 1985;Stavely 1984a;Stavely and Grafton 1989;Stavely et al 1989a,b;1994b;Kelly et al 1996 Ur-7…”

“…''0''-''6,''5''; most frequent: ''6,5'' Christ and Groth 1982b;Kolmer and Groth 1982;Grafton et al 1985;Kelly et al 1996 Ur-9…”

“…Stavely and Grafton (1985) reported that the resistance in the differential 'Mexico 235' is due to at least two, and possibly three, dominant genes or tightly linked series of genes. Kardin and Groth (1985) found indications that the old differential 'Aurora' contains at least two independent major dominant rust resistance genes, and Grafton et al (1985) reported the presence of two genes in 'Aurora', one of which (Ur c ) appeared similar to a gene found in 'Olathe'. 'PC-50' has a gene (Ur-9) expressed in the primary leaf stage and one (Ur-12) expressed at a later stage Jung et al 1998).…”