Plant Genome I Conference
Town & Country Conference Center, San Diego, CA, November, 1992.
PG-I: 75pg1
CHROMOSOME REGIONS AFFECTING QUANTITATIVE TRAITS IN MAIZE GROWN
IN STRESS/NONSTRESS ENVIRONMENTS.
S. G. Jarboe 1, M. Lee 1, W. L. Woodman 1, and K. R. Lamkey 2.
1 Department of Agronomy, Iowa State University, and 2 USDA-ARS,
Ames, IA 50011.
RFLPs were used to locate and analyze chromosome regions
conferring resistance to second generation European corn borer
(2ECB) and for their effect on several agronomic traits. A
sample of 150 F2:3 lines from the cross of inbreds B52 and Mo17
was analyzed for RFLP genotypes at 100 loci and evaluated for
traits in two replications in each of three environments.
Chromosome regions affecting traits were detected by single
factor analysis and interval mapping. Six regions were detected
for 2ECB resistance. Each of the two regions with largest
effects explained about 20% of the variation and were derived
from B52. Gene action varied among chromosome regions. RFLP and
translocation mapping of resistance genes identified similar
regions. Regions affecting grain yield and kernel weight were
also identified but their location and relative contribution
differed in water stress and nonstress growing conditions.
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