Ιατρικά Άρθρα

Publication date: Available online 18 June 2018
Source:Microbiological Research
Author(s): Run Huang, Zhibin Feng, Xiaoyan Chi, Xiaoqiang Sun, Yang Lu, Baoshen Zhang, Ruiyang Lu, Wangtai Luo, Yanhua Wang, Jing Miao, Yihe Ge
Fusarium graminearum is the major causal agent of Fusarium head blight (FHB) disease in cereal crops worldwide. Infection with this fungal phytopathogen can regularly cause severe yield and quality losses and mycotoxin contamination in grains. In previous other studies, one research group reported that pyrrolnitrin had an ability to suppress of mycelial growth of F. graminearum. Other groups revealed that phenazine-1-carboxamide, a derivative of phenazine-1-carboxylic acid, could also inhibit the growth of F. graminearum and showed great potentials in the bioprotection of crops from FHB disease. In our recent work with Pseudomonas chlororaphis strain G05, however, we found that although the phz operon (phenazine biosynthetic gene cluster) was knocked out, the phenazine-deficient mutant G05Δphz still exhibited effective inhibition of the mycelial growth of some fungal phytopathogens in pathogen inhibition assay, especially including F. graminearum, Colletotrichum gloeosporioides, Botrytis cintrea. With our further investigations, including deletion and complementation of the prn operon (pyrrolnitrin biosynthetic gene cluster), purification and identification of fungal compounds, we first verified that not phenazines but pyrrolnitrin biosynthesized in P. chlororaphis G05 plays an essential role in growth suppression of F. graminearum and the bioprotection of cereal crops against FHB disease.

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