Plant Genome II Conference
Town & Country Conference Center, San Diego, CA, January, 1994.
PG-II: MAPPING QTL FOR SEED PROTEIN AND OIL IN SOYBEAN
MAPPING QTL FOR SEED PROTEIN AND OIL IN SOYBEAN.
E.C. Brummer 1, G.L. Graef 2, J. Orf 3, J.R. Wilcox 4, and R.C.
Shoemaker 5. 1 Dept. of Agronomy, Iowa State Univ., 2 Univ. of
Nebraska, 3 Univ. of Minnesota, 4 USDA-ARS-FCR, Purdue Univ., 5
USDA-ARS-FCR, Iowa State Univ., Ames, IA 50011.
Soybean is one of the most important sources of vegetable
oil and protein meal in the world. We are conducting a
long-range study in an attempt to map chromosomal segments on the
ISU/USDA public soybean RFLP map which are associated with the
expression of these traits. Eight F2 populations have been
derived from crosses between Glycine max lines. Advanced
generations have been grown in the field in Minnesota, Indiana,
and Nebraska for two years. Results from regression analyses
show that several RFLP loci are associated with QTL in each
population. Common QTL among the populations have also been
observed in some cases. Similarities in QTL location have also
been noted with results from a G. max x G. soia population
(Diets et al, TAG, 1992). In general, RFLP loci detect QTL for
both protein and oil, but some loci appear to be linked only to
one trait or the other. This suggests that selection may be
possible to concurrently increase both protein and oil, something
which has eluded traditional breeding programs. Additionally,
the use of multiple populations in mapping studies providing us
with information on duplicate loci and new, informative
probe/enzyme combinations. This will make the public molecular
map more useful in breeding programs which use cultivated (G.
max) soybean accessions as parents.
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