期刊
PLANT JOURNAL
卷 66, 期 5, 页码 863-876出版社
WILEY
DOI: 10.1111/j.1365-313X.2011.04547.x
关键词
microRNA; sulfate deficiency; sulfate assimilation; ATP sulfurylase; Arabidopsis
资金
- British Biotechnology and Biological Sciences Research Council (BBSRC)
- Plant Bioscience Ltd.
- European Commission [SIROCCO LSHG-CT-2006-037900]
- Weigel lab at the MPI for Developmental Biology
- RIKEN
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
- Grants-in-Aid for Scientific Research [23770036] Funding Source: KAKEN
- Natural Environment Research Council [NE/C508069/1] Funding Source: researchfish
P>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.
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