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Molecular Diagnosis and Diversity for Regulated Xanthomonas
Bacterial virulence factors
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Author: Dorota Tekielska
Internal reviewer: Jens Boch
Expert reviewer: 
NA
Capsicum annuum PI163192 (Cook & Guevara, 1984).
Identified.
NA
Bs1 is a dominant resistance which results in a fast hypersensitive response reaction upon recognition of the type III effector AvrBs1 from Xanthomonas campestris pv. vesicatoria. The resistance is rapidly overcome in the field by mutation of avrBs1 in the bacteria.
NA
Capsicum chacoense (Cook & Stall, 1963).
cloned, sequenced
NA
Bs2 is a dominant resistance which causes a hypersensitive response upon recognition of the type III effector AvrBs2 from Xanthomonas campestris pv. vesicatoria. The Bs2 gene encodes an NB-LRR type of resistance protein (REF).
NA
Capsicum annuum PI271322 (Kim & Hartmann, 1985).
cloned and sequenced (Roemer et al., 2007)
NA
Bs3 is a dominant resistance gene and not expressed during normal life of the plant. The TAL effector AvrBs3 from Xanthomonas campestris pv. vesicatoria binds to the promoter of Bs3 and causes expression which results in programmed cell death (Roemer et al., 2007). Bs3 encodes a flavin mono-oxygenase, but it is unknown whether the Bs3 protein has any enzymatic activity. The bs3 variant has a deletion in the promoter which prohibits binding of AvrBs3 (Roemer et al., 2007). Instead, bs3 is triggered by binding of AvrBs3-2, a variant of AvrBS3 with deletions of repeats that cause it to recognize the modified sequence in the promoter of bs3 (Roemer et al., 2007).
NA
Capsicum annuum PI235047 (Stall et al., 2009).
Cloned and sequenced.
NA
Bs4 was mapped (Ballvora et al., 2001) and cloned (Schornack et al., 2004). It is a dominant resistance gene that recognizes the TAL effector AvrBs4 from Xanthomonas campestris pv. vesicatoria. Bs4 encodes a TIR-NBS-LRR protein (Schornack et al., XXXX). It is the first example of a resistances detecting TALEs that is not based on an executor gene, but appears to directly detect the AvrBs4 protein, severely truncated variants of Bs4, as well as high levels of AvrBs3, likely by binding (Schornack et al., 2004).
NA
Capsicum annuum ECW12346 (Jones et al., 2002; Vallejos et al., 2010).
Identified, mapped
NA
bs5 is a recessive resistance which has been mapped within the genome of.
NA
Capsicum annuum ECW12346 (Jones et al., 2002; Vallejos et al., 2010).
Identified, mapped
NA
bs6 is a recessive resistance
NA
Capsicum baccatum var. pendulum (Potnis et al., 2012).
Identified.
NA
Bs7 is a dominant resistance gene.
Cook AA, Stall RE (1963). Inheritance of resistance in pepper to bacterial spot. Phytopathology 53: 1060-1062.
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Leister RT, Dahlbeck D, Day B, Li Y, Chesnokova O, Staskawicz BJ (2005). Molecular genetic evidence for the role of SGT1 in the intramolecular complementation of Bs2 protein activity in Nicotiana benthamiana. Plant Cell 17: 1268-1278. DOI: 10.1105/tpc.104.029637
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Riva-Souza EM, Rodrigues R, Sudré CP, Pereira MG, Viana AP, do Amaral jr. AT (2007). Obtaining pepper F2:3 lines with resistance to the bacterial spot usingthe pedigree method. Horticultura Brasileira 25: 567-571. PDF: www.scielo.br/pdf/hb/v25n4/a14v25n4.pdf
Romero AM, Kousik CS, Ritchie DF (2002). Temperature sensitivity of the hypersensitive response of bell pepper to Xanthomonas axonopodis pv. vesicatoria. Phytopathology 92: 197-203. DOI: 10.1094/PHYTO.2002.92.2.197
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