جستجوی مقالات مرتبط با کلیدواژه « resistance to herbicide » در نشریات گروه « زراعت »

In order to investigate the resistance level ofannual ryegrass (Lolium rigidum) biotypes to Pinoxaden herbicide, greenhouse and Petri dish bioassay studies based on CRD with 4 replications were conducted at Weed Research Department of Iranian Research Institute of plant Protection during 2008 and 2009. The resistance level of biotypes was determined in pot trials, while the herbicide dose required for 50% reduction of coleoptile length of the susceptible biotypes (GR50) as well as the susceptibility and resistance level of biotypes were studied in Petri dish bioassay trials. The experiments were conducted on 12 annual ryegrass biotypes collected from wheat fields of Fars province. The susceptible (FS) and 11 suspected to resistant biotypes (including ES1, ES2, ES3, ES4, ES5, M1, M2, M3, F1, FJ and FI2) were sprayed at 2- to 4-leaf stage by applying 0-32 times of recommended dose of Pinoxaden herbicide including 0. 45, 90, 180, 360, 720 and 1440 g ai ha-1 in greenhouse experiments. The germinated seeds were also exposed to 0, 0.4, 0.8, 1.6, 3.2, 6.4 and 12.8 g ai l-1 in Petri dish bioassay experiments. The percentage of dry matter and plant survival of each biotype was calculated compared to the untreated control and the resistance level was determined four weeks after herbicide application in greenhouse experiments. The percentage of coleoptile length of biotypes compared to the control was assessed 7 days after treating the germinated seeds with herbicide in Petri dish bioassays and the resistance level of biotypes were calculated. The results of greenhouse and Petri dish bioassay studies indicated that 4 biotypes including ES4, M2, F1 and FJ were resistant to Pinoxaden herbicide. As a general conclusion, most of the studied biotypes were sensitive pionoxaden.

In order to investigate the resistance of 8 suspected Wild oat populations (Avena ludoviciana), collected from Shoosh, to Chevalier herbicide a whole plant bioassay and seed bioassay (screening and dose response tests) were carried out in 4 replication. This investigation was conducted during 1388 and 1389 in the Department of Weed Research, in Plant Protection Research Institute of Iran. Four weeks after herbicide application in the screening test in pots with recommended dose and in dose response assay with 1-32 fold of recommended dose at 2-4 leaf stage, plant fresh and dry weight percent, survived plant rate, and EWRC visual rating were measured. In seed bioassay in petri dish with the measurement of coleoptile length seven days after treating germinated seeds of sensitive population, discriminating dose was determined and used to treat all other populations. This survey, demonstrated the resistance of KHI, KHB, KHC, and KHA populations in Adkins methode and moss methode. These results were also confirmed by petri dish bioassay. On the base of these results, it is the first report of resistance of wild oat population to Iodisulfuron+Mezosulfuron (ALS inhibitor) herbicide in Iran