Browsing by Subject "biokontrolli"

Endophytic bacterial strain Serratia plymuthica A30 has been shown to be a good bio-control candidate against pathogen Dickeya solani that is causing soft-rot of potato (Solanum tuberosum) also in Finland. The aim of this master’s thesis was to analyze previously produced RNA sequencing data and to understand which hormone signaling pathways were mainly activated in potato tubers treated by antagonist Serratia plymuthica A30 and Dickeya solani Ds 432-1. The main objective was to compare transcriptional differences of the genes related to jasmonate/ethylene signaling pathways and salicylic acid signaling pathway in pathogen/antagonist treated potato and pathogen treated potato at 24 hour time point after treatments. The additional objective was to identify potential differences between gene groups related to plant defense responses. RNA sequencing data was verified by RT-qPCR method. According to the RNA sequencing, the most active hormonal signaling pathways were jasmonate, ethylene and brassinosteroid signaling pathways after simultanous treatment with pathogen and antagonist. The least active pathways were salicylic acid and gibberellin signaling pathways. However, salicylic and gibberellic acid pathways were the most active in pathogen treated potato tubers and jasmonate, ethylene, auxin and brassinosteroid signaling pathways showed less activity. Based on the results of this thesis, it would appear that the high efficiency of Serratia plymuthica A30 against Dickeya solani pathogen in potato would be based on its direct inhibiting effect against the pathogen but also on the possible activation of jasmonate/ethylene signalling pathway which may lead to an efficient defense response against necrotrophic pathogens.