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. 2020 Nov 5;11:586421. doi: 10.3389/fpls.2020.586421

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Copyright © 2020 Zhou, Yang, Kronzucker and Shi.

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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A flow diagram of the role of Se in regulating As bioavailability and accumulation and transport through xylem and phloem to the grains. Inositol transporters (INTs) may be involved in the mobilization of As from source tissues to the phloem for subsequent transport to seed tissues. As(III) and Se(IV) enter the plant root system by sharing the NIP2;1 transporter. As(V) and Se(IV) are absorbed by plant roots via phosphate transporters. ABC transporters can sequester As(III)-PCs complexes into vacuoles. Se significantly limits the transport of As from the root to the grain through enhanced development of apoplastic barriers and up-regulation of related genes (red arrow).