The effects of high temperature level on square Bt protein concentration of Bt cotton

摘要: Abstract Higher boll worm survival rates were detected after high temperature presented during square period in Bt cotton. The objective of this study was to investigate the effects level on efficacy two different types cotton cultivars at squaring stage. During 2011 2013 growth seasons, treatments ranged from 34 44°C climate chambers, and field experiments under weather with various levels conducted protein concentration nitrogen metabolism. chamber showed that insecticidal contents reduced 24 h elevated for both cultivars, whereas significant declines >38°C, only slightly numerical reductions observed when below 38°C. Similar responses also experimental sites 2013. Correspondingly, 38°C seems have little effect amino acid concentrations, soluble contents, glutamic-pyruvic transaminase (GPT) glutamic-oxalacetic (GOT) activities as well protease peptidase activities; however, above 38°C, enhanced decreased GPT GOT activities, bolstered detected. In general, higher is (>38°C), larger changes compound key enzymes cycle. findings indicated unstable insect resistance related