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. 2021 May 28;12:666066. doi: 10.3389/fpls.2021.666066

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Copyright © 2021 Li, Fang, Hegelund and Liu.

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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Principal component analysis of tomato leaf and root hydraulic conductance (K_leaf and K_root), xylem sap ABA concentration (ABA), gene expression of five leaf PIPs (LP), root PIPs (RP) and OST1 for (A) AC, (B) flacca, and (C) two genotypes grown under ambient (400 ppm) and elevated (800 ppm) atmospheric CO₂ concentrations after progressive soil drying. AW: a[CO₂] and well water; AD: a[CO₂] and drought stress; EW, e[CO₂] and well water; ED: e[CO₂] and drought stress. The contribution of each PCA axis (PC1 and PC2) is indicated on the graph.