| Categories genes  | Tags cytokinin  leaf  senescence  disease  chloroplast  defense response  defense  cell death 
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  • Key message
    • Consistent with its involvement in leaf senescence, RLS1 was up-regulated during dark-induced leaf senescence and down-regulated by cytokinin
    • In this study, the genetic and physiological characteristics of the rice rls1 (rapid leaf senescence 1) mutant were identified
    • The rapid loss of chlorophyll content during senescence was the main cause of accelerated leaf senescence in rls1
    • Intriguingly, constitutive expression of RLS1 also slightly accelerated leaf senescence with decreased chlorophyll content in transgenic rice plants
    • A novel protein RLS1 with NB-ARM domains is involved in chloroplast degradation during leaf senescence in rice
    • The rls1 mutant developed small, yellow-brown lesions resembling disease scattered over the whole surfaces of leaves that displayed earlier senescence than those of wild-type plants
    • Microscopic observation indicated that PCD was misregulated, probably resulting in the accelerated degradation of chloroplasts in rls1 leaves
    • A screen for suppressors of RLS1 activation identified RMC (Root Meander Curling) as essential for the RLS1-activated defense response
    • An activated form of NB-ARC protein RLS1 functions with cysteine-rich receptor-like protein RMC to trigger cell death in rice.
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