Early Identification of Herbicide Modes of Action by the Use of Chlorophyll Fluorescence Measurements
Sirous Hassannejad, Ramin Lotfi, Soheila Porheidar Ghafarbi, Abdallah Oukarroum, Amin Abbasi, Hazem M. Kalaji, Anshu Rastogi
Abstract
plants was studied. Chlorophyll content and fluorescence, leaf temperature, and stomatal conductance were evaluated at 12 h, 36 h, 60 h, and 84 h after herbicides application. U46 Combi Fluid, Cruz, and MR did not have a significant effect on chlorophyll fluorescence induction curves as compared to the control treatment. However, Basagran, Bromicide, Lumax, and Gramoxone showed significant changes in the shape of polyphasic fluorescence transients (OJIP transients). Variations in chlorophyll content index, leaf temperature, and stomatal conductance parameters were dependent on the type of applied herbicide. Our study revealed that the specific impact of the applied herbicides on the photosynthetic efficiency of plants is related to their chemical groups and their mechanism of action.