Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 547073
Title Exogenous γ-aminobutyric acid treatment improves the cold tolerance of zucchini fruit during postharvest storage
Author(s) Palma, Francisco; Carvajal, Fátima; Jiménez-Muñoz, Raquel; Pulido, Amada; Jamilena, Manuel; Garrido, Dolores
Source Plant Physiology and Biochemistry 136 (2019). - ISSN 0981-9428 - p. 188 - 195.
DOI https://doi.org/10.1016/j.plaphy.2019.01.023
Department(s) Plant Breeding
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) ATP - Chilling - GABA shunt - NADH - Putrescine - Zucchini - γ-aminobutyric acid
Abstract

This work examines the effect of a treatment with 1 mM of γ-aminobutyric acid (GABA) on zucchini fruit during postharvest cold storage. Specifically, the effect of GABA on postharvest quality was measured, as well as its implication in the GABA shunt and other related metabolic pathways. The treatments were performed in Sinatra, a variety of zucchini highly sensitive to low-temperature storage. The application of GABA improved the quality of zucchini fruit stored at 4 °C, with a reduction of chilling-injury index, weight loss, and cell death, as well as a lower rate of electrolyte leakage. GABA content was significantly higher in the treated fruit than in the control fruit at all times analyzed. At the end of the storage period, GABA-treated fruit had higher contents of both proline and putrescine. The catabolism of this polyamine was not affected by exogenous GABA. Also, over the long term, the treatment induced the GABA shunt by increasing the activities of the enzymes GABA transaminase (GABA-T) and glutamate decarboxylase (GAD). GABA-treated fruit contained higher levels of fumarate and malate than did non-treated fruit, as well as higher ATP and NADH contents. These results imply that the GABA shunt is involved in providing metabolites to produce energy, reduce power, and help the fruit to cope with cold stress over the long term.

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