Pseudomonas aeruginosa inducing rice resistance against Rhizoctonia solani: production of salicylic acid and peroxidases
Jazyk angličtina Země Spojené státy americké Médium print
Typ dokumentu časopisecké články
PubMed
17176755
DOI
10.1007/bf02931579
Knihovny.cz E-zdroje
- MeSH
- antibióza fyziologie MeSH
- antifungální látky metabolismus MeSH
- biologická kontrola škůdců metody MeSH
- kořeny rostlin růst a vývoj metabolismus MeSH
- kyselina salicylová metabolismus MeSH
- nemoci rostlin mikrobiologie MeSH
- peroxidasy metabolismus MeSH
- přirozená imunita MeSH
- Pseudomonas aeruginosa fyziologie MeSH
- Rhizoctonia patogenita MeSH
- rýže (rod) enzymologie mikrobiologie MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- antifungální látky MeSH
- kyselina salicylová MeSH
- peroxidasy MeSH
Three isolates of Pseudomonas aeruginosa were used for seed treatment of rice; all showed plant growth promoting activity and induced systemic resistance in rice against Rhizoctonia solani G5 and increased seed yield. Production of salicylic acid (Sal) by P. aeruginosa both in vitro and in vivo was quantified with high performance liquid chromatography. All three isolates produced more Sal in King's B broth than in induced roots. Using a split root system, more Sal accumulated in root tissues of bacterized site than in distant roots on the opposite site of the root system after 1 d, but this difference decreased after 3 d. Sal concentration 0-200 g/L showed no inhibition of mycelial growth of R. solani in vitro, while at > or =300 g/L it inhibited it. P. aeruginosa-pretreated rice plants challenged inoculation with R. solani (as pathogen), an additional increase in the accumulation of peroxidase was observed. Three pathogenesis-related peroxidases in induced rice plants were detected; molar mass of these purified peroxidases was 28, 36 and 47 kDa. Purified peroxidase showed antifungal activity against phytopathogenic fungi R. solani, Pyricularia oryzae and Helminthosporium oryzae.
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