Assessment of organic acid accumulation and its related genes in peach

•Degradation of organic acids caused low acidity of peach fruits.•Malate accumulation is controlled at the level of metabolism and vacuolar storage.•Citrate accumulation is controlled at the level of metabolism.•Seven candidate genes for peach fruit acidity were identified. Fruit acidity is an impor...

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Published inFood chemistry Vol. 334; p. 127567
Main Authors Zheng, Beibei, Zhao, Li, Jiang, Xiaohan, Cherono, Sylvia, Liu, JingJing, Ogutu, Collins, Ntini, Charmaine, Zhang, Xiujun, Han, Yuepeng
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2021
Subjects
Citrate
citrates
cultivars
degradation
food chemistry
fruit acids
Fruit Quality
fruiting
GABA
genes
Malate
malates
measurement
metabolism
Peach
peaches
reaction kinetics
sensory properties
storage
synthesis
vacuoles
Citrate
GABA
Malate
Fruit Quality
Peach
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Summary:•Degradation of organic acids caused low acidity of peach fruits.•Malate accumulation is controlled at the level of metabolism and vacuolar storage.•Citrate accumulation is controlled at the level of metabolism.•Seven candidate genes for peach fruit acidity were identified. Fruit acidity is an important determinant of peach organoleptic quality, but its regulatory mechanism remains elusive. Measurement of organic acids in ripe fruits of seventy-five peach cultivars revealed the predominant components malate and citrate, accompanied by quinate. Organic acid accumulation increased at early stages of fruit growth, but exhibited a more dramatic reduction in low-acid cultivar during later stages of fruit development compared to high-acid cultivars. Low-acid cultivars showed citrate degradation and less transport of malate into the vacuole due to up- and down-regulation of a GABA pathway gene GAD and a malate transporter gene ALMT9, respectively. The NAD-MDH1 gene might control the rate-limiting step in malate synthesis, while three genes, PDK, PK, and ADH, could affect citrate synthesis through the pyruvate-to-acetyl-CoA-to-citrate pathway. Altogether, these results suggested that malate accumulation is controlled at the level of metabolism and vacuolar storage, while metabolism is crucial for citrate accumulation in peach.
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ISSN:0308-8146
1873-7072
1873-7072
DOI:10.1016/j.foodchem.2020.127567