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Burdiak, Paweł, 2026, "CRK5 delays dark-induced senescence by sustaining antioxidant homeostasis and suppressing salicylic acid signaling", https://doi.org/10.18150/JNHDXC, RepOD, V1
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This work investigates the role of CRK5 in regulating antioxidant homeostasis and cell death during dark-induced senescence in Arabidopsis thaliana. Using genetic, physiological, biochemical, and transcriptomic approaches, the study demonstrates that loss of CRK5 function promotes salicylic acid (SA)-dependent senescence, ROS accumulation, membrane damage, and cell death, accompanied by accelerated degradation of carotenoids and xanthophylls and compensatory increases in enzymatic and non-enzymatic antioxidant activities. Importantly, suppressing SA biosynthesis or enhancing its catabolism in crk5 double-mutant backgrounds largely restores the wild-type phenotype, supporting CRK5 as an upstream negative regulator of SA-mediated responses. Transcriptomic analysis further reveals extensive changes in genes associated with senescence, autophagy, cell death, and redox regulation, highlighting CRK5 as an important regulator connecting hormonal signaling, oxidative homeostasis, and leaf survival during senescence.
senescence, antioxidant homeostasis, receptor kinase, plant signaling, stomatal conductance
Kamran M, Burdiak P, Rusaczonek A, Zarrin Ghalami R, Karpiński SM. CRK5 preserves antioxidant homeostasis and prevents cell death during dark-induced senescence through inhibiting the salicylic acid signaling pathway. BMC Plant Biol. 2026 Jul 25;26(1):1814. doi: 10.1186/s12870-026-09557-9. https://pmc.ncbi.nlm.nih.gov/articles/PMC13685261/ doi: doi: 10.1186/s12870-026-09557-9
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