Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium,cylindric-clavate to clavate,short-pedicellate or apedicellate asci,hyaline to brown,1-septate to muriform ascospor...Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium,cylindric-clavate to clavate,short-pedicellate or apedicellate asci,hyaline to brown,1-septate to muriform ascospores.Its asexual morphs are coelomycetous and comprising pycnidial or acervulus conidiomata,phialidic,hyaline conidiogenous cells and hyaline or pale brown,septate or aseptate conidia.The majority of these cosmopolitan species are plant associated fungi which can be pathogens on a wide range of hosts and some species are of particular relevance for quarantine measures.Recent studies have significantly improved the taxonomy and systematics of didymellaceous taxa based on molecular phylogenetics.In contrast to the accurate and detailed studies on the asexual morphs which are common obligate pathogens,information on their usually saprobic sexual morphs is still limited.Among these phenotypically diverse species,spore characteristics are quite unique as most have hyaline spores with 0-1 septum,while only Neomicrosphaeropsis and Didymellocamarosporium are reported as producing pigmented,muriform spores.These dematiaceous muriform spores are characteristic of a considerable number of species that may be quite divergent in other characters.During taxonomic investigations on the diversity of didymellaceous taxa,we have isolated species from Alhagi pseudalhagi,Coronilla emerus,Cytisus sp.,Elaeagnus angustifolia and Spartium junceum in Italy,Russia and Uzbekistan.A comprehensive phylogeny,based on four loci(ITS,LSU,rpb2 and tub2)is used to infer species relationships.Comprehensive morphological descriptions and in-depth phylogenetic investigations of five new species viz.Ascochyta coronillae-emeri,Microsphaeropsis spartii-juncei,Neomicrosphaeropsis alhagi-pseudalhagi,N.cytisicola and N.elaeagni are presented.展开更多
A study was undertaken to collect and identify saprobic fungi associated with Musa spp.(banana)from Taiwan(China),and Thailand.Samples were collected during the dry season and their morpho-molecular relationships were...A study was undertaken to collect and identify saprobic fungi associated with Musa spp.(banana)from Taiwan(China),and Thailand.Samples were collected during the dry season and their morpho-molecular relationships were investigated.Five brown pleosporalean hyphomycetous taxa in Periconiaceae and Torulaceae viz.Periconia cortaderiae,P.delonicis,Torula chromolaenae,T.fici,and T.masonii were identified for the first time from Musa spp.(Musaceae).Phylogenetic analyses of a combined SSU,LSU,ITS,RPB2 and TEF DNA sequence dataset further justified the taxonomic placements of these five taxa in the above mentioned families.Periconia delonicis is reported for the first time on a monocotyledonous host and T.masonii is the first geographical record from Taiwan(China).展开更多
The family Testudinaceae and its intergeneric classification are poorly understood.This is due to overlap of morphological characteristics in genera and lack of DNA sequence data to infer phylogenetic relationships.Th...The family Testudinaceae and its intergeneric classification are poorly understood.This is due to overlap of morphological characteristics in genera and lack of DNA sequence data to infer phylogenetic relationships.The main objective of the present paper is to establish a novel genus,Muritestudina,based on distinct morphological characteristics and analyses of combined LSU,SSU,ITS,rpb2 and tef1 sequence data.We also fill the gap of our current knowledge on the phylogenetic position of Testudinaceae.Based on the morphological characteristics of species representing existing genera of Testudinaceae,we herein introduce a new genus,Muritestudina with M.chiangraiensis as the type species.The new genus is characterized by globose to subglobose,ostiolate ascomata;a peridium of brown to dark-brown cells of textura angularis;septate and cellular pseudoparaphyses;cylindric-clavate asci with a distinct pedicel;and hyaline,ellipsoidal and muriform ascospores.The new genus differs from the other genera in Testudinaceae in having hyaline,muriform ascospores.Combined analyses of ribosomal and protein coding gene sequence data confirmed that our new taxon belongs in Testudinaceae with a close relationship with Neotestudina rosatii.展开更多
基金the Committee for Coordination Science and Technology Development under the Cabinet of Ministers of Uzbekistan for research support(#P3-2014-0830174425).
文摘Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium,cylindric-clavate to clavate,short-pedicellate or apedicellate asci,hyaline to brown,1-septate to muriform ascospores.Its asexual morphs are coelomycetous and comprising pycnidial or acervulus conidiomata,phialidic,hyaline conidiogenous cells and hyaline or pale brown,septate or aseptate conidia.The majority of these cosmopolitan species are plant associated fungi which can be pathogens on a wide range of hosts and some species are of particular relevance for quarantine measures.Recent studies have significantly improved the taxonomy and systematics of didymellaceous taxa based on molecular phylogenetics.In contrast to the accurate and detailed studies on the asexual morphs which are common obligate pathogens,information on their usually saprobic sexual morphs is still limited.Among these phenotypically diverse species,spore characteristics are quite unique as most have hyaline spores with 0-1 septum,while only Neomicrosphaeropsis and Didymellocamarosporium are reported as producing pigmented,muriform spores.These dematiaceous muriform spores are characteristic of a considerable number of species that may be quite divergent in other characters.During taxonomic investigations on the diversity of didymellaceous taxa,we have isolated species from Alhagi pseudalhagi,Coronilla emerus,Cytisus sp.,Elaeagnus angustifolia and Spartium junceum in Italy,Russia and Uzbekistan.A comprehensive phylogeny,based on four loci(ITS,LSU,rpb2 and tub2)is used to infer species relationships.Comprehensive morphological descriptions and in-depth phylogenetic investigations of five new species viz.Ascochyta coronillae-emeri,Microsphaeropsis spartii-juncei,Neomicrosphaeropsis alhagi-pseudalhagi,N.cytisicola and N.elaeagni are presented.
基金supported by Key Research Project“Agroforestry Systems for restoration and bio-industry technology development(grant no.2017YFC0505101)”.We also thank Biology Experimental Center,Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences for providing the facilities of molecular laboratory.Binu C.Samarakoon is grateful to Danushka Tennakoon for collecting the specimens from Taiwan(China),Dr.Dhanushka N.Wanasinghe and Junfu Li for the valuable comments and suggestions on the morphological studies of Periconia and Torula.Rungtiwa Phookamsak thanks CAS President’s International Fellowship Initiative(PIFI)for young staff(grant no.Y9215811Q1)the National Science Foundation of China(NSFC)project code 31850410489(grant no.Y81I982211)+3 种基金Chiang Mai University for financial support.Samantha C.Karunarathna thanks CAS President’s International Fellowship Initiative(PIFI)young staff under the grant number:2020FYC0002the National Science Foundation of China(NSFC)for funding this work under the project code 31851110759Jianchu Xu thanks Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(grant no.QYZDY-SSW-SMC014)the Strategic Priority Research Program of Chinese Academy of Sciences for supporting this research.
文摘A study was undertaken to collect and identify saprobic fungi associated with Musa spp.(banana)from Taiwan(China),and Thailand.Samples were collected during the dry season and their morpho-molecular relationships were investigated.Five brown pleosporalean hyphomycetous taxa in Periconiaceae and Torulaceae viz.Periconia cortaderiae,P.delonicis,Torula chromolaenae,T.fici,and T.masonii were identified for the first time from Musa spp.(Musaceae).Phylogenetic analyses of a combined SSU,LSU,ITS,RPB2 and TEF DNA sequence dataset further justified the taxonomic placements of these five taxa in the above mentioned families.Periconia delonicis is reported for the first time on a monocotyledonous host and T.masonii is the first geographical record from Taiwan(China).
基金the National Research Council of Thailand(Mae Fah Luang University)for grants“Biodiversity,phylogeny and role of fungal endophytes of Pandanaceae”(Grant No.:592010200112).
文摘The family Testudinaceae and its intergeneric classification are poorly understood.This is due to overlap of morphological characteristics in genera and lack of DNA sequence data to infer phylogenetic relationships.The main objective of the present paper is to establish a novel genus,Muritestudina,based on distinct morphological characteristics and analyses of combined LSU,SSU,ITS,rpb2 and tef1 sequence data.We also fill the gap of our current knowledge on the phylogenetic position of Testudinaceae.Based on the morphological characteristics of species representing existing genera of Testudinaceae,we herein introduce a new genus,Muritestudina with M.chiangraiensis as the type species.The new genus is characterized by globose to subglobose,ostiolate ascomata;a peridium of brown to dark-brown cells of textura angularis;septate and cellular pseudoparaphyses;cylindric-clavate asci with a distinct pedicel;and hyaline,ellipsoidal and muriform ascospores.The new genus differs from the other genera in Testudinaceae in having hyaline,muriform ascospores.Combined analyses of ribosomal and protein coding gene sequence data confirmed that our new taxon belongs in Testudinaceae with a close relationship with Neotestudina rosatii.
