Exogenous GABA stimulates endogenous GABA and phenolic acid contents in tomato plants under salt stress

Year 2018, Volume: 14 Issue: 1, 61 - 64, 30.03.2018

Fazilet Çekiç

https://doi.org/10.18466/cbayarfbe.348935

Cited By: 6

Abstract

Gamma
aminobutyric acid (GABA) is a non protein amino acid found in various organisms
including plants. In recent years, the signal role of GABA in the stress
response has of special interest. However, the effects of exogenous GABA on
phenolic compounds which have special roles as antioxidants are not well known.
In this study, the effects of exogenous GABA on endogenous GABA and phenolic
contents were analyzed in tomato plants under salt stress. Tomato plants were
grown in a growth chamber under controlled conditions and NaCl and GABA were
applied in Hoagland solution. Qualitative and quantitative analysis of GABA and
phenolic compounds (Benzoic, caffeic, chlorogenic, gallic, hydroxybenzoic,
syringic, rosmarinic, p-coumaric, sinapic, t-cinnamic, t-ferulic acids,
catechin, epicatechin, hesperidin and quercetin) were measured by HPLC. Differences
were found in chlorogenic acid, coumaric acid and gallic acid among the
phenolic substances. We found a significant increase in gallic acid
and coumaric acid contents under 200 mM NaCl and GABA applications. Exogenous GABA treatment caused a slight increase in
endogenous GABA content. The increase in GABA content under GABA+salt
treatments were higher than that of single salt and GABA applications. According
to our results we can suggest that exogenous GABA could enhance the stress
response by enhancing some phenolic substances and GABA content under salt
stress.

Keywords

Gamma-aminobutyric acid, HPLC, salinity, Solanum lycopersicon

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