Interplay of SLIM1 and miR395 in the regulation of sulfate assimilation in Arabidopsis

Kawashima, CG, Matthewman, CA, Huang, S, Lee, B-R, Yoshimoto, N, Koprivova, A, Rubio-Somoza, I, Todesco, M, Rathjen, T, Saito, K, Takahashi, H, Dalmay, T and Kopriva, S (2011) Interplay of SLIM1 and miR395 in the regulation of sulfate assimilation in Arabidopsis. The Plant Journal, 66 (5). pp. 863-876. ISSN 1365-313X

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Abstract

MicroRNAs play a key role in the control of plant development and response to adverse environmental conditions. For example, microRNA395 (miR395), which targets three out of four isoforms of ATP sulfurylase, the first enzyme of sulfate assimilation, as well as a low-affinity sulfate transporter, SULTR2;1, is strongly induced by sulfate deficiency. However, other components of sulfate assimilation are induced by sulfate starvation, so that the role of miR395 is counterintuitive. Here, we describe the regulation of miR395 and its targets by sulfate starvation. We show that miR395 is important for the increased translocation of sulfate to the shoots during sulfate starvation. MiR395 together with the SULFUR LIMITATION 1 transcription factor maintain optimal levels of ATP sulfurylase transcripts to enable increased flux through the sulfate assimilation pathway in sulfate-deficient plants. Reduced expression of ATP sulfurylase (ATPS) alone affects both sulfate translocation and flux, but SULTR2;1 is important for the full rate of sulfate translocation to the shoots. Thus, miR395 is an integral part of the regulatory circuit controlling plant sulfate assimilation with a complex mechanism of action.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
University of East Anglia > Faculty of Science > Research Groups > Plant Sciences
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Depositing User: Deborah Clemitshaw
Date Deposited: 01 Nov 2011 11:46
Last Modified: 25 Jul 2018 03:44
URI: https://ueaeprints.uea.ac.uk/id/eprint/35331
DOI: 10.1111/j.1365-313X.2011.04547.x

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