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. 2017 Mar 10;8:285. doi: 10.3389/fpls.2017.00285

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Copyright © 2017 Kumar, Verma and Trivedi.

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) or licensor 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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miRNA mediated regulation of Phosphate and Sulfate uptake, transport and assimilation in plants. (A) Phosphate (Pi) uptake is regulated by phosphate high affinity transporters. PHO1 and PHO2 are responsible for the xylem loading of Pi. PHO2 act as a negative regulator of Pi loading whereas PHO1 helps in Pi loading into xylem. Various miRNAs regulation under Pi starved and sufficient conditions are shown in orange boxes. The miR399 and isoforms act as primary regulator of Pi uptake, transport and assimilation by negatively regulating PHO2 under Pi starved conditions. Induced by phosphate starvation1 (IPS1) pairs with miR399 and causes its sequestration. (B) Sulfate uptake, transport and assimilation involves different transporters. Groups 1 and 2 sulfate transporters are involved in the sulfate uptake from soil to roots. Group 3 is associated with root to shoot transport of sulfate. The expression of various miRNAs under sulfate starved condition has been shown in orange boxes. miR395 has been reported to be sulfate-specific miRNA and acts as a primary regulator of sulfate deficient responsive pathway. Under sulfate deficient condition, miR395 positively regulates expression of a low affinity transporter AtSul2;1 to help in the sulfate uptake and transport to shoot and leaves.