Pto Mutants Differentially Activate Prf-Dependent, avrPto-Independent Resistance and Gene-for-Gene Resistance1
AUTOR(ES)
Xiao, Fangming
FONTE
American Society of Plant Biologists
RESUMO
Pto confers disease resistance to Pseudomonas syringae pv tomato carrying the cognate avrPto gene. Overexpression of Pto under the cauliflower mosaic virus 35S promoter activates spontaneous lesions and confers disease resistance in tomato (Lycopersicon esculentum) plants in the absence of avrPto. Here, we show that these AvrPto-independent defenses require a functional Prf gene. Several Pto-interacting (Pti) proteins are thought to play a role in Pto-mediated defense pathways. To test if interactions with Pti proteins are required for the AvrPto-independent defense responses by Pto overexpression, we isolated several Pto mutants that were unable to interact with one or more Pti proteins, but retained normal interaction with AvrPto. Overexpression of two mutants, PtoG50S and PtoR150S, failed to activate AvrPto-independent defense responses or confer enhanced resistance to the virulent P. s. pv tomato. When introduced into plants carrying 35S::Pto, 35S::PtoG50S dominantly suppressed the AvrPto-independent resistance caused by former transgene. 35S::PtoG50S also blocked the induction of a number of defense genes by the wild-type 35S::Pto. However, 35S::PtoG50S and 35S::PtoR150S plants were completely resistant to P. s. pv tomato (avrPto), indicating a normal gene-for-gene resistance. Furthermore, 35S::PtoG50S plants exhibited normal induction of defense genes in recognition of avrPto. Thus, the AvrPto-independent defense activation and gene-for-gene resistance mediated by Pto are functionally separable.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=166884Documentos Relacionados
- Isolation of Ethylene-Insensitive Soybean Mutants That Are Altered in Pathogen Susceptibility and Gene-for-Gene Disease Resistance1
- Gene-for-gene disease resistance without the hypersensitive response in Arabidopsis dnd1 mutant
- AvrPto-dependent Pto-interacting proteins and AvrPto-interacting proteins in tomato
- The cloned avirulence gene avrPto induces disease resistance in tomato cultivars containing the Pto resistance gene.
- Identification of regions in alleles of the flax rust resistance gene L that determine differences in gene-for-gene specificity.