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. 2022 Oct 28;4(2):100468. doi: 10.1016/j.xplc.2022.100468

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© 2022 The Author(s)

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

PMC Copyright notice

Diagram of AtABCG14-mediated circular long-distance transport of iP-type CKs.

In the root, iPR/iP produced in pericycle cells (PCs) or retrieved from the apoplast by an unknown transporter (?) are loaded into the root xylem by G14 (AtABCG14) on the PC PM. Then iPR/iP are transported via the xylem in the leaf transpiration stream. In the shoot, iPR/iP released from the xylem or synthesized in the shoot are loaded into the phloem companion cells (PCCs) in the stems or leaf veins by an unknown transporter (?). iPR/iP in the phloem are then transported upstream to the leaf minor veins and unloaded into the apoplast by G14 on the PCC PM for shoot distribution. iPR/iP in the phloem are transported downstream to the root. In the root, iPR/iP are unloaded from the phloem to the apoplast by G14 on the PCC PM. Finally, the released iPR/iP can be used for another round of circular long-distance transport.