期刊
HEREDITY
卷 107, 期 1, 页码 80-86出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/hdy.2010.169
关键词
dinitroaniline; herbicide resistance; yield; fitness cost; cell division; tubulin
资金
- Burgundy Region Council
- French-Chinese Association for Scientific Research (AFCRST) PRA
A mutant Thr-239-Ileu at the alpha 2-tubulin gene was found to confer resistance to dinitroanilines, a family of mitosis-disrupting herbicides. However, mutations affecting microtubule polymerization and cell division are expected to impact growth and reproduction, that is, the fitness of a resistant weed or the yield of a tolerant crop, although it has not been demonstrated yet. This study was designed to test this hypothesis for the growth and reproduction of near-isogenic resistant and susceptible materials that were created in F-2 and F-3 generations after a Setaria viridis x S. italica cross. Differential growth was noticeable at the very onset of seedling growth. The homozygous resistant plants, grown both in a greenhouse cabinet and in the field, were smaller and had lower 1000-grain weight and therefore a lower yield. This fitness penalty is certainly due to modified cell division kinetics. Although the presence of the mutant allele accounted for 20% yield losses, there were also measurable benefits of dinitroaniline resistance, and these benefits are discussed. Heredity (2011) 107, 80-86; doi:10.1038/hdy.2010.169; published online 19 January 2011
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