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- W2138210064 abstract "Summary Plant defences require a multitude of tightly regulated resistance responses. In Arabidopsis, the unique gain‐of‐function mutant suppressor of npr1‐1 constitutive 1 ( snc1 ) carries a point mutation in a Resistance ( R )‐gene, resulting in constitutive activation of defence responses without interaction with pathogens. This has allowed us to identify various downstream signalling components essential in multiple defence pathways. One mutant that suppresses snc1 ‐mediated constitutive resistance is modifier of snc1 5 ( mos5 ), which carries a 15‐bp deletion in UBA1 , one of two ubiquitin‐activating enzyme genes in Arabidopsis. A mutation in UBA2 does not suppress snc1 , suggesting that these two genes are not equally required in Arabidopsis disease resistance. On the other hand, a mos5 uba2 double mutant is lethal, implying partial redundancy of the two homologues. Apart from affecting snc1 ‐mediated resistance, mos5 also exhibits enhanced disease susceptibility to a virulent pathogen and is impaired in response to infection with avirulent bacteria carrying the protease elicitor AvrRpt2. The mos5 mutation in the C‐terminus of UBA1 might affect binding affinity of the downstream ubiquitin‐conjugating enzymes, thus perturbing ubiquitination of target proteins. Furthermore, SGT1b and RAR1, which are necessary for resistance conferred by the SNC1 ‐related R ‐genes RPP4 and RPP5 , are dispensable in snc1 ‐mediated resistance. Our data reveal the definite requirement for the ubiquitination pathway in the activation and downstream signalling of several R‐proteins." @default.
- W2138210064 created "2016-06-24" @default.
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- W2138210064 date "2007-01-08" @default.
- W2138210064 modified "2023-10-15" @default.
- W2138210064 title "The ubiquitin pathway is required for innate immunity in Arabidopsis" @default.
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- W2138210064 doi "https://doi.org/10.1111/j.1365-313x.2006.02978.x" @default.
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