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Inheritance and Chromosomal Assignment of Powdery Mildew Resistance Genes in Two Winter Wheat Germplasm Lines

G. Srni^a, J. P. Murphy^b,*, J. H. Lyerly^b, S. Leath^c and D. S. Marshall^d

^a Pioneer Hi-Bred International, Inc., 7300 NW 62nd Avenue, P.O. Box 1004, Johnston, IA 50131-1004
^b Dep. of Crop Science, North Carolina State Univ., Raleigh, NC 27695
^c Dep. of Plant Pathology, North Carolina State Univ., Raleigh, NC 27695
^d USDA-ARS, and Dep. of Plant Pathology, North Carolina State Univ., Raleigh, NC 27695

View larger version (93K): [in a new window]   Fig. 1. Gel images for simple sequence repeat (SSR) markers in the Saluda x NCA4 population. (A) Xwmc525 with fragment sizes of 230 bp (Saluda) and 211 bp (NCA4). (B) Xbarc292 with fragment sizes 219 bp (Saluda) and null (NCA4). (C) Xgwm4 with fragment sizes 253 bp (Saluda) and null (NCA4). Lanes 1 and 2 are Saluda (Sal) and NCA4 (N). Lanes 3 to 18 are F2 plants labeled according to the disease reaction of their F2:3 progeny as follows: R, resistant; Se, segregating; and Su, susceptible.

View larger version (13K): [in a new window]   Fig. 2. Map positions of the powdery mildew resistance genes on wheat chromosome 7AL in the germplasm lines NCA4 and NCAG11. PM, powdery mildew.

View larger version (70K): [in a new window]   Fig. 3. Gel images for amplified fragment length polymorphism (AFLP) markers in the Saluda x NCAG11 population. (A) XE36M55-126 with a fragment size of 126 bp (NCAG11) and null (Saluda). (B) XE38M54-196 with a fragment size of 196 bp (NCAG11) and null (Saluda). Lane 1 is the molecular weight standards. Lanes 2 and 3 are NCAG11 (N) and Saluda (Sal). Lanes 4 and 5 are the resistant (RB) and susceptible bulks (SB). Lanes 6 to 21 are F2 plants labeled according to the disease reaction of their F2:3 progeny as follows: R, resistant; Se, segregating; and Su, susceptible.

View larger version (111K): [in a new window]   Fig. 4. Gel images for simple sequence repeat (SSR) markers in the Saluda x NCAG11 population. (A) Xgwm332 with fragment sizes of 212 bp (Saluda) and 210 bp (NCAG11). Lanes 1 and 19 are Saluda (Sal). Lanes 2 and 18 are NCAG11 (N). Lanes 3 to 17 are F2 plants labeled according to the disease reaction of their F2:3 progeny as follows: R, resistant; Se, segregating; and Su, susceptible. (B) Xwmc525 with fragment sizes of 228 bp (Saluda) and 258 bp (NCAG11). Lanes 1 and 2 are Saluda and NCAG11. Lanes 3 to 18 are F2 plants labeled according to the disease reaction of their F2:3 progeny.