title: Integration of metabolomics and subcellular organelle expression microarray to increase understanding the organic acid changes in post-harvest citrus fruit.
abstract: Citric acid plays an important role in fresh fruit flavor and its adaptability to post-harvest storage conditions. In order to explore organic acid regulatory mechanisms in post-harvest citrus fruit, systematic biological analyses were conducted on stored Hirado Buntan Pummelo (HBP; Citrus grandis) fruits. High-performance capillary electrophoresis, subcellular organelle expression microarray, real-time quantitative reverse transcription polymerase chain reaction, gas chromatography mass spectrometry (GC-MS), and conventional physiological and biochemical analyses were undertaken. The results showed that the concentration of organic acids in HBP underwent a regular fluctuation. GC-MS-based metabolic profiling indicated that succinic acid, γ-aminobutyric acid (GABA), and glutamine contents increased, but 2-oxoglutaric acid content declined, which further confirmed that the GABA shunt may have some regulatory roles in organic acid catabolism processes. In addition, the concentration of organic acids was significantly correlated with senescence-related physiological processes, such as hydrogen peroxide content as well as superoxide dismutase and peroxidase activities, which showed that organic acids could be regarded as important parameters for measuring citrus fruit post-harvest senescence processes.
authors.affiliation: Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, Hubei, 430070, China.
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Sun
authors.forename: Andan
authors.initials: A
authors.lastname: Zhu
authors.forename: Shuzhen
authors.initials: S
authors.lastname: Liu
authors.forename: Ling
authors.initials: L
authors.lastname: Sheng
authors.forename: Qiaoli
authors.initials: Q
authors.lastname: Ma
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Elsayed Mohamed Elsayed
authors.initials: EM
authors.lastname: Nishawy
authors.forename: Yunliu
authors.initials: Y
authors.lastname: Zeng
authors.forename: Juan
authors.initials: J
authors.lastname: Xu
authors.forename: Zhaocheng
authors.initials: Z
authors.lastname: Ma
authors.forename: Yunjiang
authors.initials: Y
authors.lastname: Cheng
authors.forename: Xiuxin
authors.initials: X
authors.lastname: Deng
mesh_terms: D000596:Amino Acids / Q000378:metabolism; D050260:Carbohydrate Metabolism / Q000235:genetics; D002264:Carboxylic Acids / Q000378:metabolism*; D002957:Citrus / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D055442:Metabolome / Q000235:genetics; D055432:Metabolomics; D008954:Models, Biological; D020411:Oligonucleotide Array Sequence Analysis; D015388:Organelles / Q000235:genetics*; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012995:Solubility; D013347:Subcellular Fractions / Q000378:metabolism
chemical_list: D000596:Amino Acids; D002264:Carboxylic Acids; D017382:Reactive Oxygen Species
keywords: Citrus; gene expression; metabolite; organic acids; post-harvest storage