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- Title
Evolving Multiple Resistance to EPSPS, GS, ALS, PSI, PPO, and Synthetic Auxin Herbicides in Dominican Republic Parthenium hysterophorus Populations. A Physiological and Biochemical Study.
- Authors
Palma-Bautista, Candelario; Hoyos, Verónica; Plaza, Guido; Vázquez-García, José G.; Rosario, Jesús; Rojano-Delgado, Antonia M.; De Prado, Rafael
- Abstract
Two Parthenium hysterophorus populations resistant (R) and susceptible (S) harvested in banana crop from the Dominican Republic were studied. All S plants died when the herbicides were applied at field dose, except with paraquat. For the R population, the order of plant survival was as follows: glyphosate and paraquat > flazasulfuron > glufosinate > fomesafen > 2,4-D. The resistance factors obtained in the dose–response assays showed a high resistance to glyphosate, flazasulfuron, and fomesafen, medium resistance to glufosinate and 2,4-D, and a natural tolerance to paraquat (resistance factor (RF) = 1.0). The I50 values obtained in the 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS), acetolactate synthase (ALS), and glutamine synthetase (GS) activity studies with glyphosate, flazasulfuron, and glufosinate, respectively, were greater in R than in S. The effect of fomesafen was measured by the Proto IX levels, obtaining five times more Proto IX in the S than in the R population. The resistance to 2,4-D in the R was determined by the lower accumulation of ethylene compared to the S population. The studies with 14C-paraquat conclude that the lower absorption and translocation in both the R and S populations would explain the natural tolerance of P. hysterophorus. This is the first case of multiple resistance to herbicides with different mechanisms of action confirmed in P. hysterophorus.
- Subjects
DOMINICAN Republic; PARTHENIUM hysterophorus; HERBICIDES; GLYPHOSATE; HERBICIDE resistance; ACETOLACTATE synthase; GLUTAMINE synthetase; AUXIN
- Publication
Agronomy, 2020, Vol 10, Issue 4, p554
- ISSN
2073-4395
- Publication type
Article
- DOI
10.3390/agronomy10040554