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- Title
Resistance to PPO-inhibiting herbicide in Palmer amaranth from Arkansas.
- Authors
Salas, Reiofeli A; Burgos, Nilda R; Tranel, Patrick J; Singh, Shilpa; Glasgow, Les; Scott, Robert C; Nichols, Robert L
- Abstract
BACKGROUND The widespread occurrence of ALS inhibitor- and glyphosate-resistant Amaranthus palmeri has led to increasing use of protoporphyrinogen oxidase ( PPO)-inhibiting herbicides in cotton and soybean. Studies were conducted to confirm resistance to fomesafen (a PPO inhibitor), determine the resistance frequency, examine the resistance profile to other foliar-applied herbicides and investigate the resistance mechanism of resistant plants in a population collected in 2011 ( AR11-LAW B) and its progenies from two cycles of fomesafen selection ( C1 and C2). RESULTS The frequency of fomesafen-resistant plants increased from 5% in the original AR11-LAW-B to 17% in the C2 population. The amounts of fomesafen that caused 50% growth reduction were 6-, 13- and 21-fold greater in AR11-LAW-B, C1 and C2 populations, respectively, than in the sensitive ecotype. The AR11-LAW-B population was sensitive to atrazine, dicamba, glufosinate, glyphosate and mesotrione but resistant to ALS-inhibiting herbicides pyrithiobac and trifloxysulfuron. Fomesafen survivors from C1 and C2 populations tested positive for the PPO glycine 210 deletion previously reported in waterhemp ( Amaranthus tuberculatus). CONCLUSION These studies confirmed that Palmer amaranth in Arkansas has evolved resistance to foliar-applied PPO-inhibiting herbicide. © 2016 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
- Subjects
ARKANSAS; PROTOPORPHYRINOGEN oxidase; HERBICIDE resistance; AMARANTHUS palmeri; ATRAZINE; DICAMBA; GLUFOSINATE; AGRICULTURE
- Publication
Pest Management Science, 2016, Vol 72, Issue 5, p864
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.4241