The response of maize lines to foliar herbicides
Year: 2022
Type: conference-abstract
Abstract: Herbicide application and weed control in seed maize production requires special attention due to maize lines larger sensitivity to herbicides compared with hybrid maize. The introduction of foliarly applied herbicides on the market resulted in new possibilities for weed control, while causing problems more than ever to sensitive maize lines. The aim of study was to examine and define the sensitivity/tolerance of the five maize inbred lines (belonging to different heterotic groups), based on visual estimation of injury, morphological response (height, weight, and biomass), as well as in alterations of secondary metabolites from maize leaves (phenolics, protein sulfhydryl groups, phytic and inorganic phosphorus). Two herbicide groups were applied in the study: triketons (mesotrione and topramezone) and sulfonylureas (rimsulfuron and foramsulfuron). Lines from independent heterotic group, which were sensitive to herbicides, expressed higher visible damages together with significant reduction of grain yield, biomass, weight and leaf area reduction, mainly induced by sulfonylurea herbicides. Parallel with that, significant increase in phenolics, phytic and inorganic phosphorus, and drop in protein sulfhydryl groups were observed in their leaves. Tolerant lines (belonging to Lancaster group) had mainly insignificant grain yield reduce, also no reduction of measured morphological parameters, together with lesser variations in sulfhydryl groups, content of phytic and inorganic phosphorus, as well as increase in phenolics content. Among examined secondary metabolites, phytate was the main factor, contributing to herbicide tolerance in maize lines. Owing to lesser yield decrease and variation in content of examined secondary metabolites, expressed in treatments with triketone herbicides, their usage could be safe in maize lines. The obtained data suggest that mesotrione can be applied in seed maize for weed control, while with sulfonylurea herbicides, application must follow guidelines and instructions obtained by field and greenhouse monitoring.
Authors: Brankov, Milan, Dragičević, Vesna, Vukadinović, Jelena, Srdić, Jelena, Simic, Milena
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W7113597467