Document Type : Weed Science
Authors
1 Department of Agronomy and plant breeding, Razi University
2 Department of Agronomy and Plant Breeding, Azarbaijan Shahid Madani University
Abstract
In order to evaluate the resistance of wild oat (Avena ludoviciana) biotypes to Clodinafop-propargyl, as well as the fitness of susceptible and resistant biotypes, this experiment was conducted in wheat fields of Eslamabad-Gharb, Kermanshah. 313 farms were sampled and after determining the resistance percentage in the greenhouse (using differentiation dose), the fitness of susceptible and resistant biotypes were examined based on the germination characteristics versus different treatments of drought, temperature and acidity. The results showed that the amount of LD50 for susceptible and resistant biotypes were 22.04 and 190.08 g ai ha-1, respectively. Therefore, the resistance index was calculated to to 8.62. Germination percentage for resistant biotypes in -0.1, -0.2, -0.4 and -0.6 MPa were 45.7%, 56.8%, 0.63% and 70.4%, and for susceptible biotypes were 22.2%, 30.5%, 44.4% and 56.9%, respectively compared to the control. The trend of germination rate and seed vigor of susceptible and resistant biotypes were similar in different values of osmotic potential. Resistant biotypes at low temperatures had a higher germination percentage and rate than susceptible biotype, while at 20°C germination percentage and rate of susceptible biotype were significantly higher than resistant biotype. Soil acidity had little effect on the fitness of the studied biotypes.
Keywords
Main Subjects
)