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. 2021 Jul 23;21:349. doi: 10.1186/s12870-021-03124-0

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 8 — Expression profiles of ABA biosynthetic and catabolic genes in the root of WT tomato and CCD8 RNAi line under normal P and P starvation. A, schematic representation of ABA biosynthesis and inactivation [82]: I represents carotenoid precursor biosynthesis; II represents the formation of epoxycarotenoids and their cleavage in the plastids, III represents reactions in the cytosol for the formation of ABA. B, hierarchical clustering diagram of ABA biosynthesis pathway related genes in WT at 4-day normal P and P starvation. YP4 and NP4 represent tomato WT at 4 days of control P and P starvation, respectively. CCD8.YP4 and CCD8.NP4 represent the CCD8 RNAi line at 4 days of control P and P starvation, respectively. DXS, 1-DEOXY-D-XYLULOSE-5-PHOSPHATE SYNTHASE; DXR, 1-DEOXY-D-XYLULOSE 5-PHOSPHATE REDUCTOISOMERASE; MCT, 2-C-METHYL-D-ERYTHRITOL 4-PHOSPHATE CYTIDYLYLTRANSFERASE; CMK, 4-DIPHOSPHOCYTIDYL-2-C-METHYL-D-ERYTHRITOL KINASE; MDS, 2-C-METHYL-D-ERYTHRITOL 2,4-CYCLODIPHOSPHATE SYNTHASE; MDS, 4-HYDROXY-3-METHYLBUT-2-EN-1-YL DIPHOSPHATE SYNTHASE; HDR, 4-HYDROXY-3-METHYLBUT-2-ENYL DIPHOSPHATE REDUCTASE; GGPPS, GERANYLGERANYL PYROPHOSPHATE SYNTHETASE; PSY, PHYTOENE SYNTHASE; PDS, PHYTOENE DESATURASE; ZDS, ZETA-CAROTENE DESATURASE; LCY, LYCOPENE BETA CYCLASE; BCH, BETA-CAROTENE HYDROXYLASE; ZEP, ZEAXANTHIN EPOXIDASE; NSY, NEOXANTHIN SYNTHASE; NCED, EPOXYCAROTENOID DIOXYGENASE; AAO, ARABIDOPSIS ALDEHYDE OXIDASE