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. 2022 Sep 8;13:971506. doi: 10.3389/fpls.2022.971506

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Copyright © 2022 Gao, Yao, Chen, Wu, Wu, Liu, Guo and Zhang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Regulatory model and expression levels of the genes related to citric acid and malic acid metabolism and accumulation in pineapple fruits. From blue to red in the heatmap indicates the expression levels of the genes ranging from low to high in two pineapple cultivars throughout fruit development. M1, M2, M3, and M4 represented fruit flesh samples for M at 40, 80, 100, and 120 DAA, respectively, and B1, B2, and B3 represented fruit flesh samples for B at 40, 80, and 100 DAA, respectively. PK, pyruvate kinase; PDH, pyruvate dehydrogenase; CS, citrate synthase, ACO, aconitase; MDH, malate dehydrogenase; NADP-IDH, isocitrate dehydrogenase NADP; GAD, glutamate decarboxylase; ALMT, aluminum-activated malate transporter; NaDCs, sodium-dependent dicarboxylate transporter. PEP, phosphoenolpyruvate; a-KG, a-ketoglutarate; Glu, glutamate; GABA, γ-aminobutyric acid.