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. 2023 Dec 29;11(2):uhad282. doi: 10.1093/hr/uhad282

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© The Author(s) 2024. Published by Oxford University Press on behalf of Nanjing Agricultural University.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Biosynthesis pathways of purine alkaloids and expression of related genes. Biosynthesis pathways of purine alkaloids and expression of related genes. (1) SAMS: S-adenosine-l-methionine synthetase. (2) SAM-Mtases: S-adenosine- l-methionine dependent methyltransferase. (3) SAH hydrolase: S-adenosine-l-homocysteine hydrolase. (4) MTR: methionine synthase. (5) Adenosine nucleosidase. (6) APRT: adenine phosphoribosyl transferase. (7) ADK: adenosine kinase. (8) AMPD: adenosine 5′-monophosphate deaminase. (9) Inosine 5′-monophosphate dehydrogenase. (10) 5′-NT: 5′-nucleotidase. (11) GUD: guanosine deaminase. (12) 7-Methylxanthosine synthase. (13) 7-Methylxanthosine nucleosidase. (14) 3-NMTs: theobromine synthase. (15) TCS1: caffeine synthase. (16) 9-NMTs: theacrine synthases. (17) 7-Methyltransferase. (18) Theophylline synthetase. (19) 3-Methyltransferase. (20) 7-Methyltransferase. (21) 3-Methylxanthine synthetase. Group 1: ‘Jianghua Kucha’; group 2: conventional tea plant cultivars.