Receptor-kinases are cell-surface proteins that detect extracellular signals and trigger intracellular responses through phosphorylation cascades. In plants, they play a central role in perceiving environmental cues, pathogen threats, and developmental signals, making them essential regulators of immunity, growth, and stress adaptation. Understanding receptor-kinase signaling pathways is a key focus of plant molecular biology, offering insights into how plants sense and respond to their ever-changing environment.
Scientists identified a gene in rapeseed (canola) called BnCrRLK1L1_5 that helps the plant resist a destructive fungal disease called Sclerotinia stem rot, which causes major crop losses worldwide. The gene works by regulating cell wall defenses and suppressing runaway cell death when the fungus attacks.
1
BnCrRLK1L1_5 was identified via genome-wide association study as a resistance gene against Sclerotinia sclerotiorum in Brassica napus, with expression strongly induced in resistant genotypes upon fungal inoculation.
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Arabidopsis plants lacking the equivalent gene (FERONIA mutant fer-4) showed enhanced disease susceptibility, and adding BnCrRLK1L1_5 back restored resistance to levels exceeding wild-type plants.
3
Co-expression of BnCrRLK1L1_5 with a cell-death-triggering protein (BAX) in tobacco leaves significantly reduced necrosis and ion leakage, indicating the gene suppresses runaway cell death during infection.
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