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Selection for Resistance to Southwestern Corn Borer Using Marker-Assisted and Conventional Backcrossing

^a Corn Host Plant Resistance Research Unit, Crop Science Research Lab., USDA-ARS, Box 9555, Mississippi State, MS 39762
^b CIMMYT Int. Apartado Postal 6-641, 06600 Mexico, D.F., Mexico
^c CIMMYT Int. P.O. Box MP 154, Mount Pleasant, Zimbabwe
^d French Agric. Res., Inc., 41295 Co. Rd. 54, Lamberton MN 56152
^e Garst Seed Company, RR2 Box 16, Marshall, MO 65340
^f Pioneer Hi-Bred International, Inc., Waimea Research Center, P.O. Box 609, Waimea, HI 96796
^g Monsanto, 700 Chesterfield Parkway North, St. Louis, MO 63198
^h D. Gonzlez-de-Len, Paseo del Atardecer 360, Villas de Irapuato, Irapuato 36650, Guanajuato, Mexico

View larger version (24K): [in a new window]   Fig. 1. Diagram of the marker-assisted backcrossing procedure employed to transfer SWCB resistance from CML67 to CML204.

View larger version (16K): [in a new window]   Fig. 2. Diagram of the conventional backcrossing procedure employed to transfer SWCB resistance from CML67 to CML204.

View larger version (40K): [in a new window]   Fig. 3. Graphical genotypes of three sequential marker-assisted selections in the BC1F1-218 lineage of the CML204 (recurrent) x CML67 (donor) population. Bars on the left of chromosomes 7, 9, and 10 indicate the position of the QTL for SWCB resistance.

View larger version (40K): [in a new window]   Fig. 4. Graphical genotypes of three conventionally selected BC2F3 lines from the CML204 (recurrent) x CML67 (donor) population. QTL regions for SWCB resistance used for MAS are indicated as bars on the left of chromosomes 7, 9, and 10. These QTL were not used in selecting the lines; they are, however, indicated to aid visual comparison of the regions selected in the two schemes.

View larger version (25K): [in a new window]   Fig. 5. Distributions of BC1F1, BC2F1, and BC2F2 populations for percentage fixed recurrent parent with selected individuals indicated for each generation. Three histograms represent individuals within the BC1F1, BC2F1, and BC2F2 populations on the basis of their percentage of homozygous recurrent parent genotype. One selected plant for each generation is indicated by a line at its respective percentage of homozygous recurrent genome on the histogram of the population from which it was selected.