Uso do ácido salicílico como atenuador aos efeitos do déficit hídrico em plantas de manjericão

Abstract

In recent years water availability has been heavily affected due to the increase in irrigated areas and the increase in greenhouse gases resulting in greater climatic variation, which generates negative impacts on plants. With this the use of mechanisms that allow plants to withstand prolonged periods of water deficits is increasingly being a strategy for maintaining agricultural production. That way, the use of salicylic acid (SA) has been gaining prominence due to its mitigating action to the effects of the water deficit. With this, the aim of this work was to evaluate the use of salicylic acid as a strategy to mitigate the effects of the water deficit on basil plants (Ocimum basilicum L.). The work was conducted in the greenhouse of the Federal Rural University of Pernambuco/Garanhuns academic unit. The experimental design was entirely randomized, with four treatments and 10 repetitions. The treatments consisted of: treatment 1-irrigated plants without the application of the SA; Treatment 2-irrigated plants with application of SA; Treatment 3- Plants not irrigated without application of the SA; and treatment 4-plants not irrigation with application of SA. The physiological variables observed were: visual symptoms; Plant height; Conductance stomatal; Relative water content; Chlorophyll content; and dry weight. With regard to visual symptoms, the salicylic acid does not mitigated the withering of unirrigated plants, not interfering blockage of height of the basil plants. As for conductance stomatal, there was an increase of more than 100% for plants not irrigated with AS (T4) when compared to non-irrigated plants without the (T3). For foliar temperature, the water deficit influenced the increase in temperature. In relation to the relative water content there was an increase of 44.5% with SA. Do SA application in the non-irrigated plants (T4) compared with the non-irrigated plants without the (T3). It is concluded that salicylic acid has contributed positively as an attenuator to the effects of water stress on basil plants, by promoting increments in the variables conductance stomatal, relative water content.