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Background

S-domain receptor-like kinases (SD-RLKs) are an important and multi-gene subfamily of plant receptor-like/pelle kinases (RLKs), which are known to play a significant role in the development and immune responses of Arabidopsis thaliana. The conserved cysteine residues in the extracellular domain of SD-RLKs make them interesting candidates for sensing reactive oxygen species (ROS), assisting oxidative stress mitigation and associated signaling pathways during abiotic stresses. However, how closely SD-RLKs are interrelated to abiotic stress mitigation and signaling remains unknown in A. thaliana.

Results

This study was initiated by examining the chromosomal localization, phylogeny, sequence and differential expression analyses of 37 SD-RLK genes using publicly accessible microarray datasets under cold, osmotic stress, genotoxic stress, drought, salt, UV-B, heat and wounding. Out of 37 SD-RLKs, 12 genes displayed differential expression patterns in both the root and the shoot tissues. Promoter structure analysis suggested that these 12 SD-RLK genes harbour several potential cis-regulatory elements (CREs), which are involved in regulating multiple abiotic stress responses. Based on these observations, we investigated the expression patterns of 12 selected SD-RLKs under ozone, wounding, oxidative (methyl viologen), UV-B, cold, and light stress at different time points using semi-qRT-PCR. Of these 12 SD-SRKs, the genes At1g61360, At1g61460, At1g61380, and At4g27300 emerged as potential candidates that maintain their expression in most of the stress treatments till exposure for 12 h. Expression patterns of these four genes were further verified under similar stress treatments using qRT-PCR. The expression analysis indicated that the gene At1g61360, At1g61380, and At1g61460 were mostly up-regulated, whereas the expression of At4g27300 either up- or down-regulated in these conditions.

Conclusions

To summarize, the computational analysis and differential transcript accumulation of SD-RLKs under various abiotic stresses suggested their association with abiotic stress tolerance and related signaling in A. thaliana. We believe that a further detailed study will decipher the specific role of these representative SD-RLKs in abiotic stress mitigation vis-a-vis signaling pathways in A. thaliana."xsd:string
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http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/author"Basu S."xsd:string
http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/author"Singh S.K."xsd:string
http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/author"Mishra Y."xsd:string
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http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/author"Trivedi M."xsd:string
http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/date"2021"xsd:gYear
http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/name"BMC Genomics"xsd:string
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http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/title"In silico analysis and expression profiling of S-domain receptor-like kinases (SD-RLKs) under different abiotic stresses in Arabidopsis thaliana."xsd:string
http://purl.uniprot.org/citations/34772363http://purl.uniprot.org/core/volume"22"xsd:string
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