To ensure survival, plants must adjust to various abiotic stresses in their environment. Identifying their stress-responsive genes is important for understanding the molecular mechanisms underlying the process of adaptation. From Salvia miltiorrhiza Bunge seedlings, we isolated and characterized two stress-related genes that are highly conserved. Both plasma membrane protein 3 genes (SmPMP3-1 and SmPMP3-2) encode two low-molecular-weight hydrophobic proteins. Cloning of their 5′-flanking regions revealed that they contain many stress-related cis-acting regulatory elements and putative protein-binding sites. Although expression of both was induced by salt and abscisic acid, treatment with salicylate, methyl jasmonate, cold, and dehydration led to down-regulation of SmPMP3-1, whereas SmPMP3-2 was up-regulation. Thus, our results demonstrated the important regulatory effects of SmPMP3 in response to various abiotic stresses.
Russian Journal of Plant Physiology – Springer Journals
Published: Dec 28, 2012
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