A study of the genic basis for differences in quantitative characters between two varieties of Triticum Aestivum L
Date
1968
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Doctoral
Abstract
Four quantitative characters, heading date, plant height, yield
and seed number, have been studied in four inbred backcross line experiments.
It was demonstrated that among the genes which differentiate the wheat
varities Ramona and Baart, there are seven loci which have detectable
effects on the four characters.
The first four detected loci (loci 1, 2, 3 and 4) were found to
be responsible for heading date inheritance. They also expressed
pleiotropic effects on plant height, yield, and seed number.
Two additional loci (loci 5 and 6) showed effects on plant
height. The genes for tall stature were found to be sensitive to
temperature and/or moisture for their expressivity.
Anoth locus (locus 7) waa observed to cause seed shattering
and consequently to reduce yield in the Baart inbred backcross experiment
in 1967. This locus may interact with its genetic background.
In the Ramona inbred backcross lines, approximately 92, 96,
82 and 57 percent of the total genetic variation for heading date, plant
height, yield and seed number respectively were due to the detected
loci. The corresponding values were 91, 75, 85 and 80 percent
respectively in the Baart inbred backcross lines.
Results from diallel cross experiments among lines isogenic for
detected loci showed that both dominance and epistasis are involved
in heading date inheritance. Only additive genic effects seem to be
important in plant height inheritance.
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Degree
Doctor of Philosophy (Ph.D.)
Department
Graduate Studies and Research
Program
Crop Science