4.7 Article

GABA enhances physio-biochemical metabolism and antioxidant capacity of germinated hulless barley under NaCl stress

Journal

JOURNAL OF PLANT PHYSIOLOGY
Volume 231, Issue -, Pages 192-201

Publisher

ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.jplph.2018.09.015

Keywords

NaCl stress; Germinated hulless barley; gamma-Aminobutyric acid; Proline; Total phenolic content; Antioxidant capacity

Categories

Funding

  1. National Natural Science Foundation of China [31871725]
  2. Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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The effects of exogenous gamma-aminobutyric acid (GABA) on the endogenous GABA metabolism and antioxidant capacity of germinated hulless barley (Hordeum vulgare L.) under NaCl stress were investigated. The results showed that all of the GABA treatments could alleviate the growth inhibition and oxidative damage by NaCl stress, with 0.5 mM being the most effective concentration. The GABA-treated barley seedlings exhibited a significantly higher content of endogenous GABA and other free amino acids, especially proline, which resulted from the changes in corresponding enzyme activity. The phenylalanine ammonia lyase (PAL), cinnamic acid 4-hydroxylase (C4H), and 4-coumarate coenzyme A ligase (4CL) activities also increased in GABA-treated barley, which led to higher total phenolic content and antioxidant capacity than that of the control barley. These results indicate that GABA treatment may be an effective way to relieve salt stress as it induces the accumulation of endogenous GABA and proline and total phenolic content, thus enhancing the antioxidant capacity.

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