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Exogenous Salicylic Acid Modifies Cell Wall Lignification, Total Phenolic Content, PAL-Activity in Wheat (Triticum aestivum L.) and Buckwheat (Fagopyrum esculentum Moench) Plants under Cadmium Chloride Impact

M. Kobyletska,Y. Kavulych,N. Romanyuk,O. Korchynska,Olga,Terek

Published 2022 in Biointerface Research in Applied Chemistry

ABSTRACT

Salicylic acid (SA) is considered one of the most important plant signaling molecules involved in abiotic and biotic stress tolerance. Application of 0,05 mM SA enhanced plants’ tolerance to cadmium stress by modulating levels of several metabolites, including components of antioxidative defense, osmolytes, secondary metabolites, and metal-chelating compounds. Seeds of bread wheat (Triticum aestivum L.) and buckwheat (Fagopyrum esculentum Moench) were presoaked in 0,05 mM SA/or distilled water for 5 h, with the following germination in a dark thermostat for 3 d. Uniform seedlings were planted into +Cd / or -Cd-containing substrate and grown for 16/8 h light/dark. It was revealed that seed pretreatment with SA alone caused a 3-5-fold decrease in phenylalanine ammonia-lyase (PAL) activity and total phenolic content compared to the control water treatment. Seed pretreatment with SA alleviated the negative impact of Cd on plant growth, PAL activity, and total phenolic content. These results indicate that salicylate treatment alleviates Cd toxicity by modifying lignin synthesis and accumulation of flavonoids in wheat and buckwheat plants. Protective effects were more pronounced for buckwheat with the studied variables' high total phenolic content.

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