Survey of salicylic acid effect on Clopyralid efficiency in control of Field bindweed (Convolvulus arvensis L.)

Abstract

Abstract This study investigated the physiological characteristics and fluorescence reflection of Field bindweed after exposure to various doses of Clopyralid alone or in combination with salicylic acid. High doses of Clopyralid increased the concentrations of malondialdehyde and hydrogen peroxide, while decreased the activities of antioxidant enzymes. High concentrations of this herbicide also decreased the amount of protein and photosynthetic pigments but increased the proline content compared to the control treatments. Applying SA three days before Clopyralid spraying intensified oxidative stress and lipid peroxidation due to the disruption of the plant's hormonal balance as a result of the use of high dose of SA. PSII performance index was reduced under Clopyralid + SA. Field bindweed photosynthetic apparatus was further altered after SA application three days before Clopyralid spraying. This study highlighted that, for a better use of Clopyralid, the use of SA could be beneficial, not only for the herbicide efficacy against field bindweed weed, but also for the environment due to lower applied doses of herbicide.