Improving copper stress tolerance in Mentha suaveolens L. by foliar application of salicylic acid

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Abstract Background: Higher absorption and translocation of copper (Cu) in plant tissues can cause serious physiological and biochemical alterations. Salicylic acid (SA) is a signaling molecule responsible for inducing stress tolerance in plants. Therefore, SA spray could provide protection against several types of stress such as Cu toxicity. In this sense, a pot study was conducted to find out whether SA spraying (0.5 and 1 mM) could remedy the Cu (40 mM) toxicity in Mentha suaveolens plants Results: Cooper stress caused a strong accumulation of Cu in the roots with a translocation of this metal to the leaves. Excessive accumulation of this metal decreased Ca, K and p contents. Copper stress also increased H2O2 accumulation and lipid peroxidation. However, SA spraying on these stressed plants decreased Cu concentrations in various parts of the plant. This decrease in Cu contents is accompanied by an increase in K, P and Ca concentrations. SA exerted also a remedial effect on the essential oils performance mainly at 0.5 mM. The histological study of the leaves of the Mentha suaveolens showed the presence of peltate and capitate glands which differ in size, stem and head. Copper decreased glands density but SA spraying increased glands number. Cu caused a variation in essential oils composition. Conclusion: SA at 0.5 mM gives the best quality essential oils of all treatments. This concentration showed the greatest contents of the majority compounds (1,8-cineole, thujanone, camphor and Pulegone).

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