title: BcMtg2 is required for multiple stress tolerance, vegetative development and virulence in Botrytis cinerea.
abstract: In Saccharomyces cerevisiae, the Mtg2 gene encodes the Obg protein, which has an important function in assembling ribosomal subunits. However, little is known about the role of the Obg GTPase in filamentous fungi. In this study, we identified an Mtg2 ortholog, BcMtg2, in B. cinerea. The BcMtg2 deletion mutant showed a defect in spore production, conidial germination and sclerotial formation. Additionally, the mutant increased sensitivity to various environmental stresses. The BcMtg2 mutant exhibited dramatically decreased virulence on host plant tissues. BcMtg2 mutant showed increased sensitivity to osmotic and oxidative stresses, and to Congo red (cell wall stress agent). In the yeast complement assay, growth defects of yeast BY4741ΔMTG2 mutant were partly restored by genetic complementation of BcMtg2 under these environmental stresses. Additionally, compared with the parental strain and complement strain, the BcMtg2 deletion mutant displayed a minor glycerol response to osmosis stress. These defective phenotypes were recovered in the complement strain ΔBcMtg2C, which was created by adding the wild-type BcMtg2 gene to the ΔBcMtg2 mutant. The results of this study indicate that BcMtg2 has a necessary role in asexual development, environmental stress response and pathogenicity in B. cinerea.
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Wenyong
authors.initials: W
authors.lastname: Shao
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Chiyuan
authors.initials: C
authors.lastname: Lv
authors.affiliation: College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Changjun
authors.initials: C
authors.lastname: Chen
mesh_terms: D020171:Botrytis / Q000201:enzymology / Q000235:genetics / Q000472:pathogenicity; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D020558:GTP Phosphohydrolases / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D010935:Plant Diseases / Q000382:microbiology*; D013312:Stress, Physiological; D037521:Virulence Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; D037521:Virulence Factors; D020558:GTP Phosphohydrolases