Metabolic Profiling of Sugars and Organic Acids, and Expression Analyses of Metabolism-Associated Genes in Two Yellow-Peel Pitaya Species.

FUM 1 , OGDH 2 , PEPC 3, and PEPC 4 and SCS 1 shared positive correlation relationship with citric acid contents, of which PEPC 3 and PEPC 4 were highly expressed at stage 5 during fruit development with an extremely significant relationship ( Table S10 ).

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