Resistance of different Camelina sativa (Brassicaceae) lines to Thrips tabaci under field conditions

Camelina, Camelina sativa (L.) Crantz (Brassicaceae) is an oilseed plant that was imported to Iran in 2015. Camelina is a cold-tolerant oilseed crop with minimal input requirements. In this study, the population density of Thrips tabaci Lindeman and its effect on the yield of different lines of camelina were investigated under field conditions. In this regard, 136 lines of camelina cultivated in the farm and for sampling, each plant was considered as a sampling unit and the number of thrips was counted on each plant after tapping. The number of healthy and injured capsules and seeds were also counted in each line with three replications. The results showed that yield decreased with increasing percentage of injured capsules. In addition, the percentage of damaged seeds was negatively correlated with the yield of camelina lines and the percentage of injured capsules was positively correlated with the percentage of damaged seeds. The results of linear regression showed that the relationship between thrips population density and yield and percentage of damaged seeds was not significant, while a positive and significant relationship was observed between thrips population density and percentage of injured capsules, meaning that with increasing thrips density, percentage of injured capsules increased, as well. Based on the findings, line 54 was recognized as the most resistant line against T. tabaci which was a semi-sensitive, resistant and tolerant line in term of antixenosis, antibiosis and tolerance mechanisms, respectively.