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Title 

Tobacco cultivars vary in induction of systemic resistance against Cucumber mosaic virus and growth promotion by Pseudomonas chlororaphis O6 and its gacS mutant

Authors 

Choong-Min RyuB R KangS H HanS M ChoJ W KloepperA J AndersonY C Kim

Publisher 

Springer Verlag (Germany)

Issue Date 

2007

Citation 

European Journal of Plant Pathology, vol. 119, no. 4, pp. 383-390

Keywords 

cucumber mosaic virusgacS two component systeminduced systemic resistanceplant growth promotioncultivardisease resistancegrowth ratetobaccopseudomonas

Abstract 

The colonization of plant roots with certain rhizosphere bacteria promotes plant growth and induces long lasting systemic protection against a broad spectrum of plant pathogens. The role of the global regulator, GacS, in the rhizosphere colonist Pseudomonas chlororaphis O6 in stimulating growth promotion and induced resistance against Cucumber mosaic virus was examined in tobacco. Responses were compared in tobacco cvs Samsun and GX3. Root colonization of Samsun with wild-type O6 and the gacS complemented mutant-elicited reduced viral symptoms and viral titre. On GX3, there was little affect on symptoms when roots were colonized by the wild-type, gacS mutant or complemented mutant but colonization by both the wild-type and the gacS mutant lowered viral titre. Wild-type O6 and the gacS mutant caused plant growth to be maintained in both tobacco cultivars after viral infection, although the affect was stronger with GX3 than Samsun. In contrast, although a chemical inducer, benzothiadiazole, reduced symptoms and viral titre in both cultivars, plant growth was suppressed. Our results indicate rhizobacteria-elicited induced viral resistance without a negative impact on growth but there was a differential response between cultivars. Detailed knowledge regarding the mechanisms inherent to these differences between cultivars requires further investigation.

ISSN 

0929-1873

Link 

http://dx.doi.org/10.1007/s10658-007-9168-y

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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