Amino acid content and biomass productivity of selected weed species as an indicator of their response to herbicide stress

Abstract

A b s t r a c t Biomass reduction and amino acid content in plants of). The fresh weight of weeds and the content of free branched-chain amino acids (valine, leucine and isoleucine) in plant tissue were recorded. Tribenuron methyl was the herbicide that most limited biomass productivity, regardless of weed species and climate conditions. S. media was more sensitive to herbicides than P. rhoeas. Weed response to herbicides was dependent on temperature, but not on relative humidity. Tribenuron methyl applied to both weed species under various temperature regimes caused significant amino acid deficiency. The reduction in amino acid content in plants of P. rhoeas was greater at warm temperature compared to the cold regime due to stronger reaction to tribenuron methyl applied under these conditions. In most of cases, the mixture of 2.4-D + dicamba induced overproduction of amino acids.

Fluctuation in amino acids content in Triticum aestivum L. cultivars as an indicator on the impact of post-emergence herbicides in controlling weeds

“…The mechanism of herbicides is blocking biochemical and physiological pathways, reducing weed biomass. A relatively new class of sulfonylurea herbicides is the most common and abundant ( Kieloch et al, 2013 ). Excessive addition of chemical herbicides alters the amino acid content in plants by interacting with other metabolic processes, where they indirectly affect nitrogen metabolism, inhibiting amino acid biosynthesis, consequently the amino acid content in plant tissues ( Radhakrishnan et al, 2018 ) .…”