Plant Genome I Conference
Town & Country Conference Center, San Diego, CA, November, 1992.
PG-I: 73pg1
LOCATION OF A SINGLE GENE ON CHROMOSOME 1D THAT EFFECTS THE
QUANTITATIVE TRAIT DAYS TO FLOWERING IN WHEAT.
Leann M. Rayfuse, M.C. Cadle and S.S. Jones, USDA-ARS, Washington
State University, Pullman, WA 99164-6420
A single gene that delays days to flowering, a quantitative
trait, has been located on chromosome 1D in wheat. This trait is
neither vernalization or photoperiod sensitive. Two populations
of 100 homozygous recombination substitution lines (RSLs) each
were used to map this gene. These RSL's were derived from
hybridization between Triticum aestivum cv. Chinese Spring or
Chinese Spring double ditelosomic 1D and a disomic substitution
line of T. tauschii chromosome 1D in Chinese Spring.
Biochemical, cytological, molecular, morphological and disease
reaction markers were used. The RSLs were grown in replicated
field trials in two locations in 1992. A bimodal distribution
was found for days to flowering. Means based on individual
allele and adjacent locus intervals showed that the QTL is distal
to the high molecular weight glutenin locus on chromosome arm
1DL.
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