The Experts below are selected from a list of 255 Experts worldwide ranked by ideXlab platform

H. A. Van Der Aa - One of the best experts on this subject based on the ideXlab platform.

  • Contributions towards a monograph of Phoma (Coelomycetes) VI — 2. Section Phyllostictoides: Outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

  • contributions towards a monograph of phoma coelomycetes vi 2 section phyllostictoides outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

J. De Gruyter - One of the best experts on this subject based on the ideXlab platform.

  • Contributions towards a monograph of Phoma (Coelomycetes) VI — 2. Section Phyllostictoides: Outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

  • contributions towards a monograph of phoma coelomycetes vi 2 section phyllostictoides outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

  • contributions towards a monograph of phoma coelomycetes vii section sclerophomella taxa with thick walled pseudoparenchymatous pycnidia
    Persoonia, 1998
    Co-Authors: G. H. Boerema, J. De Gruyter
    Abstract:

    This paper deals with ten species of Phoma, characterized by thick-walled pseudoparenchymatous pycnidia. They superficially resemble the thick-walled pycnidial phenotype in species of Phoma sect. Plenodomus, but scleroplectenchyma is lacking and teleomorphs belong to Didymella, not Leptosphaeria. Keys and indices of host-fungus and fungus-host relations are provided and short comments on the ecology and distribution of the taxa are given.

W. J. Kaiser - One of the best experts on this subject based on the ideXlab platform.

  • evolutionary relationships among ascochyta species infecting wild and cultivated hosts in the legume tribes cicereae and vicieae
    Mycologia, 2007
    Co-Authors: Tobin L. Peever, M P Barve, L J Stone, W. J. Kaiser
    Abstract:

    Evolutionary relationships were inferred among a worldwide sample of Ascochyta fungi from wild and cultivated legume hosts based on phyloge- netic analyses of DNA sequences from the ribosomal internal transcribed spacer regions (ITS), as well as portions of three protein-coding genes: glyceralde- hyde-3-phosphate-dehydrogenase (G3PD), translation elongation factor 1-alpha (EF) and chitin synthase 1 (CHS). All legume-associated Ascochyta species had nearly identical ITS sequences and clustered with other Ascochyta, Phoma and Didymella species from legume and nonlegume hosts. Ascochyta pinodes (teleomorph: Mycosphaerella pinodes (Berk. & Blox.) Vestergen) clustered with Didymella species and not with well characterized Mycosphaerella species from other hosts and we propose that the name Didymella pinodes (Berk. & Blox.) Petrak (anamorph: Ascochyta pinodes L.K. Jones) be used to describe this fungus. Analysis of G3PD revealed two major clades among legume-associated Ascochyta fungi with members of both clades infecting pea (''Ascochyta complex''). Analysis of the combined CHS, EF and G3PD datasets revealed that isolates from cultivated pea (P. sati- vum), lentil (Lens culinaris), faba bean (Vicia faba) and chickpea (Cicer arietinum) from diverse geo- graphic locations each had identical or similar sequences at all loci. Isolates from these hosts clustered in well supported clades specific for each host, suggesting a co-evolutionary history between pathogen and cultivated host. A. pisi, A. lentis, A. fabae and A. rabiei represent phylogenetic species infecting pea, lentil, faba bean and chickpea, re- spectively. Ascochyta spp. from wild relatives of pea and chickpea clustered with isolates from related cultivated hosts. Isolates sampled from big-flower vetch (Vicia grandiflora) were polyphyletic suggesting that either this host is colonized by phylogenetically distinct lineages of Ascochyta or that the hosts are polyphyletic and infected by distinct evolutionary lineages of the pathogen. Phylogenetic species identified among legume-associated Ascochyta spp.

  • Development of Didymella rabiei, the teleomorph of Ascochyta rabiei, on chickpea straw.
    Phytopathology, 1992
    Co-Authors: A. Trapero-casas, W. J. Kaiser
    Abstract:

    The teleomorph of Ascochyta rabiei was induced to develop and mature on artificially infested chickpea straw. High moisture and low temperature (5-10 C) were the major factors required for pseudothecial development and maturation. At 8 C, pseudothecia developed and matured in about 8 wk. Morphological characteristics of pseudothecia, asci, and ascospores confirmed the identification as Didymella rabiei rather than Mycosphaerella rabiei. The fungus is heterothallic, and the two mating types have been referred to as MAT1-1 and MAT1-2 (...)

G. H. Boerema - One of the best experts on this subject based on the ideXlab platform.

  • Contributions towards a monograph of Phoma (Coelomycetes) VI — 2. Section Phyllostictoides: Outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

  • contributions towards a monograph of phoma coelomycetes vi 2 section phyllostictoides outline of its taxa
    Persoonia, 2002
    Co-Authors: J. De Gruyter, G. H. Boerema, H. A. Van Der Aa
    Abstract:

    Thirty taxa in Phoma sect. Phyllostictoides, characterised by secondary septation of a variable number of conidia, are described in vitro. Two Phyllostictoides-like species are (re)classified in sect. Sclerophomella on account of certain pycnidial characteristics. Short notes on the ecology and distribution are added. Newly proposed taxa are: Phoma acetosellae (A. L. Sm. & Ramsb.) Aa & Boerema comb, nov., Phoma argillacea (Bres.) Aa & Boerema comb. nov. (teleomorph Didymella applanata (Niessl) Sacc.), Phoma nepeticola (Melnik) Dorenb. & de Gruyter comb, nov. (teleomorph Didymella catariae (Cooke & Ellis) Sacc.), Phoma destructiva var. diversispora de Gruyter & Boerema var. nov., Phoma heliopsidis (H.C. Greene) Aa & Boerema comb, nov., Phoma laundoniae Boerema & De Gruyter spec. nov. and Phoma rhei (Ellis & Everh.) Aa & Boerema comb. nov. A key is given to the cultural characteristics of all species and varieties at present recognised within the section (including the two Phywllostictoides-like species of Sclerophomella), as well as indices on host-fungus and fungus-host relations.

  • contributions towards a monograph of phoma coelomycetes vii section sclerophomella taxa with thick walled pseudoparenchymatous pycnidia
    Persoonia, 1998
    Co-Authors: G. H. Boerema, J. De Gruyter
    Abstract:

    This paper deals with ten species of Phoma, characterized by thick-walled pseudoparenchymatous pycnidia. They superficially resemble the thick-walled pycnidial phenotype in species of Phoma sect. Plenodomus, but scleroplectenchyma is lacking and teleomorphs belong to Didymella, not Leptosphaeria. Keys and indices of host-fungus and fungus-host relations are provided and short comments on the ecology and distribution of the taxa are given.

Tobin L. Peever - One of the best experts on this subject based on the ideXlab platform.

  • Development, characterization and linkage analysis of microsatellite loci for the Ascochyta blight pathogen of faba bean, Didymella fabae.
    Journal of microbiological methods, 2011
    Co-Authors: Hilal Ozkilinc, Martin I. Chilvers, Hajime Akamatsu, Mathew M. Abang, Kalyn A. Thomas, Tobin L. Peever
    Abstract:

    Eighteen microsatellite markers were developed for Didymella fabae, seventeen of which were highly polymorphic among a sample of D. fabae isolates from Syria. Genetic linkage analysis assigned the markers to eight linkage groups. These markers will facilitate population and evolutionary studies of D. fabae and related species.

  • Didymella pisi sp. nov., the teleomorph of Ascochyta pisi.
    Mycological Research, 2009
    Co-Authors: Martin I. Chilvers, Jack D. Rogers, Frank M. Dugan, Jane E. Stewart, Weidong Chen, Tobin L. Peever
    Abstract:

    The anamorphic pycnidial fungus Ascochyta pisi is one member of a species complex that causes Ascochyta blight of pea, a potentially devastating disease. The teleomorphic state of this fungus was induced under laboratory conditions. Using morphological and molecular characters, we placed the teleomorph within the genus Didymella as D. pisi and describe a heterothallic mating system using a PCR-based mating type assay and in vitro crosses. We compare D. pisi with other Didymella spp. with which it might be confused.

  • evolutionary relationships among ascochyta species infecting wild and cultivated hosts in the legume tribes cicereae and vicieae
    Mycologia, 2007
    Co-Authors: Tobin L. Peever, M P Barve, L J Stone, W. J. Kaiser
    Abstract:

    Evolutionary relationships were inferred among a worldwide sample of Ascochyta fungi from wild and cultivated legume hosts based on phyloge- netic analyses of DNA sequences from the ribosomal internal transcribed spacer regions (ITS), as well as portions of three protein-coding genes: glyceralde- hyde-3-phosphate-dehydrogenase (G3PD), translation elongation factor 1-alpha (EF) and chitin synthase 1 (CHS). All legume-associated Ascochyta species had nearly identical ITS sequences and clustered with other Ascochyta, Phoma and Didymella species from legume and nonlegume hosts. Ascochyta pinodes (teleomorph: Mycosphaerella pinodes (Berk. & Blox.) Vestergen) clustered with Didymella species and not with well characterized Mycosphaerella species from other hosts and we propose that the name Didymella pinodes (Berk. & Blox.) Petrak (anamorph: Ascochyta pinodes L.K. Jones) be used to describe this fungus. Analysis of G3PD revealed two major clades among legume-associated Ascochyta fungi with members of both clades infecting pea (''Ascochyta complex''). Analysis of the combined CHS, EF and G3PD datasets revealed that isolates from cultivated pea (P. sati- vum), lentil (Lens culinaris), faba bean (Vicia faba) and chickpea (Cicer arietinum) from diverse geo- graphic locations each had identical or similar sequences at all loci. Isolates from these hosts clustered in well supported clades specific for each host, suggesting a co-evolutionary history between pathogen and cultivated host. A. pisi, A. lentis, A. fabae and A. rabiei represent phylogenetic species infecting pea, lentil, faba bean and chickpea, re- spectively. Ascochyta spp. from wild relatives of pea and chickpea clustered with isolates from related cultivated hosts. Isolates sampled from big-flower vetch (Vicia grandiflora) were polyphyletic suggesting that either this host is colonized by phylogenetically distinct lineages of Ascochyta or that the hosts are polyphyletic and infected by distinct evolutionary lineages of the pathogen. Phylogenetic species identified among legume-associated Ascochyta spp.