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- Title
Molecular evidence of biased inheritance of trifluralin herbicide resistance in foxtail millet.
- Authors
Tian, X.; Délye, C.; Darmency, H.
- Abstract
Inheritance of trifluralin herbicide resistance was investigated for phenotype and genotype (molecular identification) in 12 segregating populations derived from crosses between resistant green foxtail ( Setaria viridis) and foxtail millet cultivars ( S. italica). Combining a herbicide bioassay and a bidirectional allele-specific polymerase chain reaction (PCR) assay, the trifluralin resistance in foxtail millet was proved to be conferred by a recessive α2-tubulin gene mutation at Ile-239, the allele transferred by green foxtail. However, a distorted segregation ratio in F2 populations was confirmed, with 16.9% resistant plants on average instead of the 25% expected for a single gene recessive mutation. This was not due to non-germinating seed and the distortion was also observed in the next generations, indicating a heritable phenomenon. After further crosses and self-fertilization, however, more advanced generations did not show the same pattern of skewed inheritance as in the early generations. These results suggest the possibility of linkage between the α2-tubulin gene and a modifier gene to explain the distorted segregation, which might be broken by crossing over.
- Subjects
TRIFLURALIN; HERBICIDES; FOXTAIL (Plants); CULTIVARS; POLYMERASE chain reaction; PLANT genetics; PLANT mutation
- Publication
Plant Breeding, 2006, Vol 125, Issue 3, p254
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1111/j.1439-0523.2006.01221.x