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- Title
psbA mutation (valine219 to isoleucine) in Poa annua resistant to metribuzin and diuron
- Authors
Barker, R. E.; Mueller-Warrant, G. W.; Liston, A.; Mengistu, L. W.
- Abstract
The herbicide-binding region of the chloroplast psbA gene from a total of 20 biotypes of Poa annua L resistant and susceptible to metribuzin and diuron was selectively amplified using PCR. Sequence analysisof the fragment from six herbicide-resistant biotypes of P annua exhibited a substitution from valine to isoleucine at position 219 of the D1 protein encoded by the psbA gene. This is the same mutation as reported for Chlamydomonas and Synechococcus through site-directed mutagenesis and in cell cultures of Chenopodium rubrum L. To our knowledge this is the first report of a higher plant exhibiting resistance in the field to photosystem II inhibitors due to a psbA mutation otherthan at position 264. The existence of additional biotypes of P annua resistant to diuron or metribuzin but lacking mutation in the herbicide-binding region indicates that resistance to these herbicides canalso be attained by other mechanisms.
- Subjects
HERBICIDES; METRIBUZIN; HERBICIDE resistance; DIURON; WEED science
- Publication
Pest Management Science, 2000, Vol 56, Issue 3, p209
- ISSN
1526-498X
- Publication type
Article