Plant Breeding (2006) 125, 254-258

X. Tian, C. Délye and H. Darmency (2006)
Molecular evidence of biased inheritance of trifluralin herbicide resistance in foxtail millet
Plant Breeding 125 (3), 254-258
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 alpha2-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 alpha2-tubulin gene and a modifier gene to explain the distorted segregation, which might be broken by crossing over.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Christophe Delye

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Setaria viridis (weed)
	Setaria italica (weed)