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Development of a Coupling-Phase SCAR Marker Linked to the Ur-7 Rust Resistance Gene and Its Occurrence in Diverse Common Bean Lines

^a Dep. of Horticultural Sciences, Texas A&M Univ., Weslaco, TX 78596
^b Dep. of Plant Pathology, Univ. of Nebraska, Lincoln, NE 68583
^c Dep. of Agronomy & Horticulture, Univ. of Nebraska, Lincoln, NE 68583. This paper was published as paper no. 14593 Journal Series, Nebraska Agricultural Research Division. Research was conducted under Projects 20-036 and 20-042

View larger version (41K): [in this window] [in a new window]   Figure 1. (a) Coupling-phase RAPD marker OAD12.550 and (b) SCAR marker SOAD12.537 amplified with the specific primer pair designed from the sequence of the RAPD marker OAD12.550 expressing polymorphism between two DNA bulks from susceptible and resistant F2 plants, between the susceptible parent GN Nebr.#1 and the resistant parent GN1140, and between the susceptible line A 55 and the resistant line BelNeb-RR-1. 1 = a 100-bp DNA marker ladder, 2 = GN Nebr.#1, 3 = GN1140, 4 = DNA bulk from susceptible F2 plants, 5 = DNA bulk from resistant F2 plants, 6 = A 55, and 7 = BelNeb-RR-1.

View larger version (11K): [in this window] [in a new window]   Figure 2. Linkage group 11 including Ur-7 controlling specific rust resistance and seven coupling-phase RAPD and SCAR markers developed using an F2 population of the common bean cross GN1140 x Nebr.#1 (GN), and the RAPD and SCAR markers linked to Ur-7 developed using a recombinant inbred line population of the cross BelNeb-RR-1 x A 55 (BA). The gene and marker names are given on the right and the length in centiMorgans is indicated on the left of linkage group 11. The SCAR marker SOAD12.537 in linkage group 11 is connected between the F2 and recombinant inbred line populations by a line.