γ-Aminobutyric acid is involved in overlapping pathways against chilling injury by modulating glutamate decarboxylase and defense responses in papaya fruit, By gholamreza Abdi

Research

Title	γ-Aminobutyric acid is involved in overlapping pathways against chilling injury by modulating glutamate decarboxylase and defense responses in papaya fruit
Type	Article
Keywords	papaya, GABA, chilling injury, abiotic stress, proline, GAD
Journal	Frontiers in Plant Science
DOI	10.3389/fpls.2023.1233477
Researchers	Ghulam Khaliq (First researcher) , Sajid ali (Second researcher) , Shaghef Ejaz (Third researcher) , gholamreza Abdi (Fourth researcher) , Yahya Faqir (Fifth researcher) , Jiahua Ma (Not in first six researchers) , Mohammed Wasim Siddiqui (Not in first six researchers) , Asgar Ali (Not in first six researchers)

Abstract

The effect of g-aminobutyric acid (GABA) treatment at two concentrations (1 mM or 5 mM) on papaya fruit stored at 4°C and 80%–90% relative humidity for 5 weeks was investigated. The application of GABA at 5 mM apparently inhibited chilling injury, internal browning, electrolyte leakage, malondialdehyde (MDA), hydrogen peroxide (H 2 O2 ), polyphenol oxidase (PPO), phospholipase D (PLD), and lipoxygenase (LOX) activities of papaya fruit. Fruit treated with 5 mM GABA enhanced the activities of ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR), superoxide dismutase (SOD), glutamate decarboxylase (GAD), and phenylalanine ammonia-lyase (PAL). In addition, GABA treatment significantly displayed higher levels of proline, endogenous GABA accumulation, phenolic contents, and total antioxidant activity than the nontreated papaya. The results suggested that GABA treatment may be a useful approach to improving the chilling tolerance of papaya fruit by reducing oxidative stress and enhancing the defense system.