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SIZ1, a small ubiquitin-related modifier ligase, controls cold signaling through regulation of salicylic acid accumulation

Miura, K.; Ohta, M.

Journal of Plant Physiology 167(7): 555-560

2010


ISSN/ISBN: 1618-1328
PMID: 19959255
DOI: 10.1016/j.jplph.2009.11.003
Accession: 055633409

Low temperature induces several genes to acquire plant cold tolerance. Here, we demonstrate that accumulation of salicylic acid (SA) is involved in the regulation of the DREB1A/CBF3 regulon and plant tolerance to cold stresses. The SA-accumulating mutant siz1 exhibits sensitivity to chilling and freezing conditions and decreased expression of DREB1A/CBF3 and its regulon genes. Reduction of SA levels in siz1 by nahG restored cold sensitivity and down-regulation of these genes. Database analyses and RT-PCR analysis revealed that the ice1 mutation also increased expression of SA-responsive genes. As well as siz1, another SA-accumulating mutant acd6 exhibited freezing sensitivity and the sensitivity was suppressed in acd6 nahG plants. Taken together, these data indicate that SA is involved in regulation of cold signaling.

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