LAUSR

BACKGROUND Selecting wheat varieties with allelopathic potential or high competitiveness against weeds is a sustainable solution for organic farming to eliminate the use of synthetic herbicides. Wheat is one of the most economically important crops. This study focuses on screening the allelopathic or competitive potential of four wheat cultivars, i.e., 'Maurizio', 'NS 40S' 'Adesso' and 'Element' on two weeds of interest due to acquired herbicide resistance, Portulaca oleracea and Lolium rigidum, through germination and growth bioassays and the identification and quantification of benzoxazinoids (BXZs) and polyphenols (phenolic acids and flavonoids). RESULTS The different cultivars showed different ability to manage surrounding weeds, and different capacity to exude or accumulate specialized metabolites in the presence of those weeds. Even more, each cultivar behaved differently depending on the weed present in the medium. The most efficient cultivar to control the tested monocot and dicot weeds was Maurizio, as effectively controlled germination and growth of L. rigidum and P. oleracea while exuding large amounts of BZXs through the roots, especially the hydroxamic acids DIMBOA and DIBOA. By contrary, NS 40S, Adesso and Element showed the potential to control just one of both weeds' growth through allelopathy or competition. CONCLUSION The work reveals that Maurizio is the most promising wheat cultivar for being proved in sustainable weed control, and that the screening of crop varieties with allelopathic potential, which results in the displacement of synthetic herbicides, is an imminent solution in ecological and sustainable agriculture. This article is protected by copyright. All rights reserved.