Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 23, Issue 8, Pages 1069-1082Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-23-8-1069
Keywords
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Funding
- Crop Functional Genomics Center [CG1133]
- Ministry of Education, Science and Technology of the Republic of Korea
- Rural Development Administration, Korea [20070401034028]
- Rural Development Administration (RDA), Republic of Korea [20070401034028] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A type HI effector protein, AvrBsT, is secreted into plant cells from Xanthomonas campestris pv. vesicatoria Bv5-4a, which causes bacterial spot disease on pepper (Capsicum annuum) and tomato (Solanum lycopersicum). To define the function and recognition of AvrBsT in the two host plants, avrBsT was introduced into the virulent pepper strain X. campestris pv. vesicatoria Ds1. Expression of AvrBsT in Ds1 rendered the strain avirulent to pepper plants. Infection of pepper leaves with Ds1 (avrBsT) expressing AvrBsT but not with near-isogenic control strains triggered a hypersensitive response (HR) accompanied by strong H2O2 generation, callose deposition, and defense-marker gene expressions. Mutation of avrBsT, however, compromised HR induction by X. campestris pv. vesicatoria Bv5-4a, suggesting its avirulence function in pepper plants. In contrast, AvrBsT acted as a virulence factor in tomato plants. Growth of strains Ds1 (avrBsT) and Bv5-4a Delta avrBsT was significantly enhanced and reduced, respectively, in tomato leaves. X. campestris pv. vesicatoria-expressed AvrBsT also significantly compromised callose deposition and defense-marker gene expression in tomato plants. Together, these results suggest that the X. campestris pv. vesicatoria type HI effector AvrBsT is differentially recognized by pepper and tomato plants.
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