Concentration of Salicylic Acid in Tomato Leaves after Foliar Aspersions of This Compound

Abstract

Increased plant tolerance to stress may be chemically induced with applications of salicylic acid (SA). The aim of this study was to determine the change in the SA leaf concentration over time in response to the SA spraying in leaves of greenhouse grown tomato. In sprayed leaves the SA concentration showed changes over time similar to the reported responses to environmental stress. Two days after the first application, the SA foliar concentration reached the maximum of 8 µg•g −1 , equivalent to twice the amount observed in the control plants. SA decreased until it reached the level of control plants eight days later. A second application showed actually the same response, but with a faster decline of SA in two days. According to the results of this assay, SA applications on tomato should be performed within a minimum interval of eight days in order to maintain the SA concentration related with the increase in plant tolerance to environmental stress.

Effect of exogenous salicylic acid or indole acetic acid on their endogenous levels, germination, and growth in maize

“…The results indicated that spraying SA or IAA at 0.25-2 mM produced significant increases in growth traits of maize plants when measured 20 DAT. The enhancing effect of SA and IAA on plant growth was reported by many investigators Guzmán-Téllez et al 2014;Khandaker et al 2018). Although, at 40 DAT, except the increment effect of 2 mM IAA on maize growth, all SA and IAA treatments did not produce any significant effect on tested growth parameters when compared with those of control.…”

“…Although, at 40 DAT, except the increment effect of 2 mM IAA on maize growth, all SA and IAA treatments did not produce any significant effect on tested growth parameters when compared with those of control. In this concern, Guzmán-Téllez et al (2014) found some differences in the values of stem and leaves of tomato between SA treated plants (0.1 mM) and control plants at 4, 12, and 15 DAT and disappeared at the end of the assay (22 DAT). The disappearance of the enhancing effect of SA and IAA treatments in growth parameters over time may be related with the decrease in the levels of endogenous SA or IAA in treated plants by time as previously mentioned.…”

“…The results indicated that the endogenous active forms of SA and IAA were responded positively to all their exogenous application treatments peaking at 2 DAT and subsequently decreasing gradually. Different plant species responded in a distinct manner to varying amounts of exogenous SA Guzmán-Téllez et al 2014or IAA (Korasick et al 2013Al-Amri 2018;Cai et al 2018) treatments. However, plants treated with SA at 1 and 2 mM only continued to possess higher levels of endogenous SA than those of control over the entire time of the measuring period, whereas, at 8 DAT, the IAA content in the all IAAtreated leaves was not possessed any significant difference as compared with the corresponded control.…”

Variation in Chitosan and Salicylic Acid Efficacy Towards Soil-borne and Air-borne Fungi and Their Suppressive Effect of Tomato Wilt Severity

“…Furthermore, for tomato, the period between application of the inducer and the effective activation of defence responses were observed within a short period, 3-7 days postinoculation [64,65]. In the same sense, Guzmán-Téllez, et al [66] reported that SA applications on tomato should be performed within a minimum interval of eight days in order to maintain SA concentration related with the increase in plant tolerance to environmental stress.…”

Changes in the Production of Salicylic and Jasmonic Acid in Potato Plants (<i>Solanum tuberosum</i>) as Response to Foliar Application of Biotic and Abiotic Inductors

“…In plants, the SA biosynthesis is from the shikimate-phenylpropanoids pathway; SA is synthesized from phenylalanine by action of the phenylalanine ammonia lyase enzyme [8]. It has been found that the exogenous application of SA in plants induces stress tolerance, increases the biological response against salinity and extreme temperatures, modifies the concentrations of antioxidants, nutrients and chlorophyll [9] and increases the protection against pathogen attack [10]; defense is related to the attack mode and form of obtaining nutrients by the pathogen (biotrophs or necrotrophs) [11]. According to studies in Arabidopsis thaliana, defense against biotrophic pathogens usually involves dependent signaling of SA, while the induced defense against herbivorous insects and necrotrophic pathogens depend of JA [12].…”