Dataset Information

Bipolenins K-N: New sesquiterpenoids from the fungal plant pathogen Bipolaris sorokiniana.

ABSTRACT: Chemical investigation of the barley and wheat fungal pathogen Bipolaris sorokiniana BRIP10943 yielded four new sativene-type sesquiterpenoid natural products, bipolenins K-N (1-4), together with seven related known analogues (5-11), and a sesterterpenoid (12). Their structures were determined by detailed analysis of spectroscopic data, supported by TDDFT calculations and comparison with previously reported analogues. These compounds were evaluated for their phytotoxic activity against wheat seedlings and wheat seed germination. The putative biosynthetic relationships between the isolated sesquiterpenoids were also explored.

SUBMITTER: Phan CS

PROVIDER: S-EPMC6720731 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Bipolenins K-N: New sesquiterpenoids from the fungal plant pathogen Bipolaris sorokiniana.

Phan Chin-Soon CS Li Hang H Kessler Simon S Solomon Peter S PS Piggott Andrew M AM Chooi Yit-Heng YH

Beilstein journal of organic chemistry 20190826

Chemical investigation of the barley and wheat fungal pathogen Bipolaris sorokiniana BRIP10943 yielded four new sativene-type sesquiterpenoid natural products, bipolenins K-N (1-4), together with seven related known analogues (5-11), and a sesterterpenoid (12). Their structures were determined by detailed analysis of spectroscopic data, supported by TDDFT calculations and comparison with previously reported analogues. These compounds were evaluated for t ...[more]

PMID: 31501669

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Project description:Mitogen-activated protein kinases (MAPKs) have been demonstrated to be involved in fungal development, sexual reproduction, pathogenicity and/or virulence in many filamentous plant pathogenic fungi, but genes for MAPKs in the fungal cereal pathogen Bipolaris sorokiniana have not been characterized. In this study, orthologues of three MAPK genes (CsSLT2, CsHOG1 and CsFUS3) and one MAPK kinase kinase (MAPKKK) gene (CsSTE11) were identified in the whole genome sequence of the B. sorokiniana isolate ND90Pr, and knockout mutants were generated for each of them. The ?Csfus3 and ?Csste11 mutants were defective in conidiation and formation of appressoria-like structures, showed hypersensitivity to oxidative stress and lost pathogenicity on non-wounded leaves of barley cv. Bowman. When inoculated on wounded leaves of Bowman, the ?Csfus3 and ?Csste11 mutants were reduced in virulence compared to the wild type. No morphological changes were observed in the ?Cshog1 mutants in comparison with the wild type; however, they were slightly reduced in growth under oxidative stress and were hypersensitive to hyperosmotic stress. The ?Cshog1 mutants formed normal appressoria-like structures but were reduced in virulence when inoculated on Bowman leaves. The ?Csslt2 mutants produced more vegetative hyphae, had lighter pigmentation, were more sensitive to cell wall degrading enzymes, and were reduced in virulence on Bowman leaves, although they formed normal appressoria like the wild type. Root infection assays indicated that the ?Cshog1 and ?Csslt2 mutants were able to infect barley roots while the ?Csfus3 and ?Csste11 failed to cause any symptoms. However, no significant difference in virulence was observed for ?Cshog1 mutants while ?Csslt2 mutants showed significantly reduced virulence on barley roots in comparison with the wild type. Our results indicated that all of these MAPK and MAPKKK genes are involved in the regulation of fungal development under normal and stress conditions and required for full virulence on barley plants.

Dataset Information

Bipolenins K-N: New sesquiterpenoids from the fungal plant pathogen Bipolaris sorokiniana.

Publications

Bipolenins K-N: New sesquiterpenoids from the fungal plant pathogen <i>Bipolaris sorokiniana</i>.

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