State of antioxidant and prooxidant balance in soybean plants under the action of synergistic mixture of herbicides pulsar (imazamox) and harmony (thifensulfuron)

Abstract

The influence of herbicides inhibitors of acetolactatsynthase (ALS), pulsar (ìmazamoks) and harmony (tifensulfuron) and their mixtures on the selective phytotoxi­city of soybean plants were investigated. It was established that under the conditions of the reduction of herbicide norms in a mixture to 5 and 0.75 l/ha, respectively, the selectivity for culture increased. This is confirmed by the increasing contents of photosynthetic pigments and efficiency of soybean-rhizobium symbiosis. It was shown a high level of correlation of data regarding the impact of herbicides on soybean plants and its nitrogen fixation activity and data on changes in status of anti-prooxidant balance. Perhaps, this is an evidence of the contribution of stress reaction to soybean herbicide action on the formation and functioning of the symbiotic nitrogen fixation.

Keywords

• selective phytotoxicity
• inhibitors of acetolactatsynthase
• photosynthetic pigments
• guaiacol peroxidase
• hydrogen peroxide
• tba-active substances
• glycine max l.