title: Effect of exogenous γ-aminobutyric acid treatment on proline accumulation and chilling injury in peach fruit after long-term cold storage.
abstract: The effect of exogenous γ-aminobutyric acid (GABA) on chilling injury of peach fruit was investigated. Freshly harvested peaches were treated with 1, 5, or 10 mM GABA at 20 °C for 10 min and then stored at 1 °C for up to 5 weeks. The results showed that all of the GABA treatments could reduce chilling injury of peach fruit with 5 mM being the most effective concentration. GABA treatment significantly enhanced the accumulation of endogenous GABA and proline, which resulted from the increased activities of glutamate decarboxylase, Δ(1)-pyrroline-5-carboxylate synthetase, and ornithine δ-aminotransferase and decreased proline dehydrogenase activity. Our results revealed that GABA treatment may be a useful technique to alleviate chilling injury in cold-stored peach fruit, and the reduction in chilling by GABA may be due to the induction of endogenous GABA and proline accumulation. These data are the first evidence that exogenous GABA induced chilling tolerance in postharvest horticultural products.
authors.affiliation: College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Shang
authors.forename: Shifeng
authors.initials: S
authors.lastname: Cao
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Yang
authors.forename: Yuting
authors.initials: Y
authors.lastname: Cai
authors.forename: Yonghua
authors.initials: Y
authors.lastname: Zheng
mesh_terms: D003080:Cold Temperature / Q000009:adverse effects*; D005519:Food Preservation / Q000379:methods*; D005638:Fruit / Q000737:chemistry* / Q000201:enzymology; D005968:Glutamate Decarboxylase / Q000378:metabolism; D009953:Ornithine-Oxo-Acid Transaminase / Q000378:metabolism; D011392:Proline / Q000032:analysis*; D011394:Proline Oxidase / Q000378:metabolism; D027861:Prunus; D013997:Time Factors; D005680:gamma-Aminobutyric Acid / Q000008:administration & dosage* / Q000032:analysis
chemical_list: D005680:gamma-Aminobutyric Acid; D011392:Proline; D011394:Proline Oxidase; D009953:Ornithine-Oxo-Acid Transaminase; D005968:Glutamate Decarboxylase