Abstract
Leucine-rich repeat (LRR)-containing proteins have been identified in diverse species, including plants. The diverse intracellular and extracellular LRR variants are responsible for numerous biological processes. We analyzed the expression patterns of Arabidopsis thaliana extracellular LRR (AtExLRR) genes, 10 receptor-like proteins, and 4 additional genes expressing the LRR-containing protein by a promoter: β-glucuronidase (GUS) study. According to in silico expression studies, several AtExLRR genes were expressed in a tissue- or stage-specific and abiotic/hormone stress-responsive manner, indicating their potential participation in specific biological processes. Based on the promoter: GUS assay, AtExLRRs were expressed in different cells and organs. A quantitative real-time PCR investigation revealed that the expressions of AtExLRR3 and AtExLRR9 were distinct under various abiotic stress conditions. This study investigated the potential roles of extracellular LRR proteins in plant growth, development, and response to various abiotic stresses.
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