Arabidopsis thaliana genes encoding defense signaling and recognition proteins exhibit contrasting evolutionary dynamics.
The interplay between pathogen effectors, their host targets, and cognate recognition proteins provides various opportunities for antagonistic cycles of selection acting on plant and pathogen to achieve or abrogate resistance, respectively. Selection has previously been shown to maintain diversity in plant proteins involved in pathogen recognition and some of their cognate pathogen effectors. We analyzed the signatures of selection on 10 Arabidopsis thaliana genes encoding defense signal transduction proteins in plants, which are potential targets of pathogen effectors. There was insufficient evidence to reject neutral evolution for 6 genes encoding signaling components consistent with these proteins not being targets of effectors and/or indicative of constraints on their ability to coevolve with pathogen effectors. Functional constraints on effector targets may have provided the driving selective force for the evolution of guard proteins. PBS1, a known target of an effector, showed little variation but is known to be monitored by a variable guard protein. Evidence of selection maintaining diversity was present at NPR1, PAD4, and EDS1. Differences in the signatures of selection observed may reflect the numbers of effectors that target a particular protein, the presence or absence of a cognate guard protein, as well as functional constraints imposed by biochemical activities or interactions with plant proteins.
Caldwell
Katherine S
KS
The Genome Center, University of California, Davis, California 95616, USA.
Michelmore
Richard W
RW
D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics*; D002265:Carboxylic Ester Hydrolases / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D019143:Evolution, Molecular; D017343:Genes, Plant; D054884:Host-Pathogen Interactions / Q000235:genetics*; D008969:Molecular Sequence Data; D020641:Polymorphism, Single Nucleotide; D017346:Protein Serine-Threonine Kinases / Q000235:genetics; D012641:Selection, Genetic; D015398:Signal Transduction / Q000235:genetics
D029681:Arabidopsis Proteins; D018744:DNA, Plant; D004268:DNA-Binding Proteins; C118837:EDS1 protein, Arabidopsis; C105496:NPR1 protein, Arabidopsis; C477340:PBS1 protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases; D002265:Carboxylic Ester Hydrolases; C400766:PAD4 protein, Arabidopsis