Plant Genome I Conference
Town & Country Conference Center, San Diego, CA, November, 1992.
PG-I: 97pg1
CHROMOSOME ARM DOSAGE AND QUANTITATIVE TRAITS IN MAIZE (Zea
mays L.).
Elizabeth A. Lee, Ed H. Coe and Larry L. Darrah, Dept. of
Agronomy and USDA-ARS, University of Missouri, Columbia, MO
65211.
Specific chromosome arms were added or removed from standard
inbred backgrounds (Mo17Ht and B73Ht) to examine how chromosome
arm dosage differences (dosage effects) coupled with genotype
differences (differential effects) influence the expression of 7
quantitatively inherited characters in maize. If a phenotypic
change results from varying the dosage of a particular chromosome
arm, then a gene (or genes) associated with the specific effect
is expected to be located on that chromosome segment. Chromosome
arm dosage differences (one, two or three doses) were generated
using 18 different B-A translocations introgressed into either a
Mo17Ht or B73Ht inbred background. Entries were assessed for
plant and ear height, leaf length and width, rind puncture
resistance, tassel branch number, and leaf angle. Dosage effects
that are differential among particular chromosome segments have
been demonstrated in this study, and possible bases behind those
differences are considered.
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