title: Molecular cloning and characterization of salt overly sensitive gene promoter from Brassica juncea (BjSOS2).
abstract: Salt Overly Sensitive (SOS) pathway comprising SOS1, SOS2 and SOS3 genes has been recognized as the key mechanism controlling ion homeostasis under salinity stress. SOS2 component of this pathway encodes a serine/threonine protein kinase that together with SOS3 activates downstream Na(+)/H(+) antiporter SOS1, reestablishing cellular ion homeostasis under salinity stress. In the present study, we have found that the transcript levels of BjSOS2 are induced in response to various abiotic stresses. We have isolated a 713 bp promoter region of SOS2 gene from Brassica juncea to study the regulation of BjSOS2 under various abiotic stress conditions and further, to examine utility of the cloned upstream region in genetic engineering experiments. For this purpose, 713 bp BjSOS2 promoter:β-glucuronidase (GUS) fusion construct, along with its two subsequent 5' deletion derivatives, D1 (443 bp) and D2 (209 bp), were stably transformed into B. juncea. Functional analysis of transgenic lines revealed significant increase in promoter activity under salinity, desiccation as well as abscisic acid (ABA) treatment which was consistent with increased transcript levels of GUS gene. BjSOS2 promoter possesses strong multi-stress inducible nature, suggesting its involvement in various aspects of stress signaling. Considering the fact that the simultaneous presence of multiple abiotic stress conditions under field conditions is a challenging threat to crop productivity, future studies may utilize the BjSOS2 promoter to drive stress-inducible expression of genes involved in imparting tolerance to multiple stresses.
authors: Plant Molecular Biology Group, International Centre for Genetic Engineering and Biotechnology, New Delhi, 110 067, India, charanpreet06@gmail.com.
authors: Charanpreet
authors: C
authors: Kaur
authors: Gautam
authors: G
authors: Kumar
authors: Suminder
authors: S
authors: Kaur
authors: Mohammad Wahid
authors: MW
authors: Ansari
authors: Ashwani
authors: A
authors: Pareek
authors: S K
authors: SK
authors: Sopory
authors: Sneh L
authors: SL
authors: Singla-Pareek
mesh_terms: D000040:Abscisic Acid / Q000494:pharmacology; D001483:Base Sequence; D015152:Blotting, Northern; D003001:Cloning, Molecular; D003890:Desiccation; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D005966:Glucuronidase / Q000235:genetics / Q000378:metabolism; D006651:Histocytochemistry; D008969:Molecular Sequence Data; D009149:Mustard Plant / Q000235:genetics* / Q000378:metabolism; D010937:Plant Growth Regulators / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics*; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D055049:Salt Tolerance / Q000235:genetics*; D036226:Seedlings / Q000235:genetics / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology; D013696:Temperature
chemical_list: D010937:Plant Growth Regulators; D010940:Plant Proteins; D012965:Sodium Chloride; D000040:Abscisic Acid; D005966:Glucuronidase
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