Characterization of imadazolinone resistant spring wheat (Triticum aestivum L.)
Date
2002-11-01
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Degree Level
Doctoral
Abstract
Spring wheat (Triticum aestivum L.) plants resistant to imidazolinone herbicides were
identified following seed mutagenesis. Six M3:6 homozygous lines were selected for
genetic study. The lines were designated as TealIMI lines 1A, 9A, 10A, 11A, 15A, and
16A. Resistant line BW755 carries a previously characterized partially dominant
resistance gene (FS-4). Based on analysis of F1, F2, backcross (BC)1F1 and F2:3
generations, resistance in lines 1A, 9A, 10A, 11A, and 16A is a partially dominant trait
inherited as a single nuclear gene. Resistance in TealIMI 15A is dominant and is
inherited as two independent nuclear-coded genes. Evaluation of F2 and F2:3
generations resulting from all possible inter-crosses between resistant lines indicated
that resistance genes in lines 1A, 9A, 10A, and 16A are allelic to FS-4. No segregation
was observed in F2 populations resulting from the cross 15A/BW755, indicating that
one of the two resistance genes in 15A is allelic to FS-4. All crosses between resistant
lines and 11A produced segregating F2 populations suggesting the presence of a unique
resistance gene in 11A. Segregating F2 populations resulting from the cross 11A/15A
gave a good fit to a three locus model, indicating that the second resistance gene in 15A
is not allelic to that found in 11A. The resistance genes were named based on the
recommended rules for gene symbolization in wheat. The FS-4 allele was renamed
Imi1. Line 15A carries resistance genes Imi1 and Imi3 whereas line 11A carries Imi2.
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Degree
Doctor of Philosophy (Ph.D.)
Department
Plant Sciences
Program
Plant Sciences