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| Content Provider | PubMed Central |
|---|---|
| Author | Yu, Q. Ahmad-hamdani, M. S. Han, H. Christoffers, M. J. Powles, S. B. |
| Copyright Year | 2013 |
| Abstract | Many herbicide-resistant weed species are polyploids, but far too little about theevolution of resistance mutations in polyploids is understood. Hexaploid wild oat(Avena fatua) is a global crop weed and many populations have evolved herbicideresistance. We studied plastidic acetyl-coenzyme A carboxylase (ACCase)-inhibitingherbicide resistance in hexaploid wild oat and revealed that resistant individuals canexpress one, two or three different plastidic ACCase gene resistance mutations(Ile-1781-Leu, Asp-2078-Gly and Cys-2088-Arg). Using ACCase resistance mutations asmolecular markers, combined with genetic, molecular and biochemical approaches, we foundin individual resistant wild-oat plants that (1) up to three unlinked ACCase gene lociassort independently following Mendelian laws for disomic inheritance, (2) all three ofthese homoeologous ACCase genes were transcribed, with each able to carry its own mutationand (3) in a hexaploid background, each individual ACCase resistance mutation confersrelatively low-level herbicide resistance, in contrast to high-level resistance conferredby the same mutations in unrelated diploid weed species of the Poaceae (grass) family. Lowresistance conferred by individual ACCase resistance mutations is likely due to a dilutioneffect by susceptible ACCase expressed by homoeologs in hexaploid wild oat and/ordifferential expression of homoeologous ACCase gene copies. Thus, polyploidy in hexaploidwild oat may slow resistance evolution. Evidence of coexisting non-target-site resistancemechanisms among wild-oat populations was also revealed. In all, these results demonstratethat herbicide resistance and its evolution can be more complex in hexaploid wild oat thanin unrelated diploid grass weeds. Our data provide a starting point for the daunting taskof understanding resistance evolution in polyploids. |
| Related Links | http://dx.doi.org/10.1038/hdy.2012.69 |
| Ending Page | 231 |
| Page Count | 12 |
| Starting Page | 220 |
| File Format | |
| ISSN | 0018067X |
| e-ISSN | 13652540 |
| Journal | Heredity |
| Issue Number | 3 |
| Volume Number | 110 |
| Language | English |
| Publisher | Nature Publishing Group |
| Publisher Date | 2013-03-01 |
| Access Restriction | Open |
| Rights Holder | Nature Publishing Group |
| Subject Keyword | Genetics(clinical) Genetics Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Genetics (clinical) |
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