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Trindade, Inês, Capitaeo, Cláudio, Dalmay, Tamas 
ORCID: https://orcid.org/0000-0003-1492-5429, Fevereiro, Manuel Pedro and dos Santos, Manuel Pedro
(2010)
miR398 and miR408 are up-regulated in response to water deficit in Medicago truncatula.
Planta, 231 (3).
pp. 705-716.
Abstract
Plant microRNAs have been implicated in various abiotic stress responses. We identified several conserved microRNAs that showed differential expression in Medicago truncatula plants subjected to water deficit: miR169 is down-regulated only in the roots and miR398a/b and miR408 are strongly up-regulated in both shoots and roots. Down-regulation of miR169 in the roots did not correlate with accumulation of its target MtHAP2-1 transcripts, suggesting that its regulation may not occur at the mRNA level or may depend on other regulatory mechanisms, which do not involve this miRNA, in water-deficit conditions. The up-regulation of miR398a/b and miR408 and the clear down-regulation of their respective target genes, which encode the copper proteins COX5b (subunit 5b of mitochondrial cytochrome c oxidase) and plantacyanin, highlight the involvement of these miRNAs in response to water deprivation in M. truncatula. Also, miR398 up-regulation is inversely correlated with the down-regulation of copper superoxide dismutase, CSD1, during water deficit. The regulation of genes encoding copper proteins by miR398a/b and miR408 suggests a link between copper homeostasis and M. truncatula adaptation to progressive water deficit.
| Item Type: | Article |
|---|---|
| Faculty \ School: | Faculty of Science > School of Biological Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Plant Sciences |
| Depositing User: | Users 2731 not found. |
| Date Deposited: | 08 Mar 2011 10:37 |
| Last Modified: | 23 Oct 2022 01:42 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/25725 |
| DOI: | 10.1007/s00425-009-1078-0 |
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