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psbA mutation (Asn 266 to Thr) in Senecio vulgaris L. confers resistance to several PS II‐inhibiting herbicides
Author(s) -
Park Kee Woong,
MallorySmith Carol A
Publication year - 2006
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1252
Subject(s) - biology , population , atrazine , point mutation , metribuzin , chenopodium , simazine , botany , mutation , genetics , weed , cross resistance , microbiology and biotechnology , gene , pesticide , weed control , agronomy , demography , sociology
DNA sequence analysis of the psbA gene encoding the D1 protein of photosystem II (PS II), the target site of PS II‐inhibiting herbicides, identified a point mutation (Asn 266 to Thr) in a bromoxynil‐resistant Senecio vulgaris L. population collected from peppermint fields in Oregon. Although this mutation has been previously reported in Synechocystis , this is the first report of this particular point mutation in a higher plant exhibiting resistance to PS II‐inhibiting herbicides. The resistant population displayed high‐level resistance to bromoxynil and terbacil (R/S ratio 10.1 and 9.3, respectively) and low‐level resistance to metribuzin and hexazinone (R/S ratio 4.2 and 2.6, respectively) when compared with the susceptible population. However, the population was not resistant to the triazine herbicides atrazine and simazine or to the urea herbicide diuron. A chlorophyll fluorescence assay confirmed the resistance levels and patterns of cross‐resistance of the whole‐plant studies. The resistant S. vulgaris plants produced fewer seeds. Differences in cross‐resistance patterns to PS II‐inhibiting herbicides and the difference in fitness cost could be exploited in a weed management program. Copyright © 2006 Society of Chemical Industry