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Mbo Nkoulou LF, Ngalle HB, Cros D, Adje COA, Fassinou NVH, Bell J, Achigan-Dako EG. Perspective for genomic-enabled prediction against black sigatoka disease and drought stress in polyploid species. FRONTIERS IN PLANT SCIENCE 2022; 13:953133. [PMID: 36388523 PMCID: PMC9650417 DOI: 10.3389/fpls.2022.953133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Genomic selection (GS) in plant breeding is explored as a promising tool to solve the problems related to the biotic and abiotic threats. Polyploid plants like bananas (Musa spp.) face the problem of drought and black sigatoka disease (BSD) that restrict their production. The conventional plant breeding is experiencing difficulties, particularly phenotyping costs and long generation interval. To overcome these difficulties, GS in plant breeding is explored as an alternative with a great potential for reducing costs and time in selection process. So far, GS does not have the same success in polyploid plants as with diploid plants because of the complexity of their genome. In this review, we present the main constraints to the application of GS in polyploid plants and the prospects for overcoming these constraints. Particular emphasis is placed on breeding for BSD and drought-two major threats to banana production-used in this review as a model of polyploid plant. It emerges that the difficulty in obtaining markers of good quality in polyploids is the first challenge of GS on polyploid plants, because the main tools used were developed for diploid species. In addition to that, there is a big challenge of mastering genetic interactions such as dominance and epistasis effects as well as the genotype by environment interaction, which are very common in polyploid plants. To get around these challenges, we have presented bioinformatics tools, as well as artificial intelligence approaches, including machine learning. Furthermore, a scheme for applying GS to banana for BSD and drought has been proposed. This review is of paramount impact for breeding programs that seek to reduce the selection cycle of polyploids despite the complexity of their genome.
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Affiliation(s)
- Luther Fort Mbo Nkoulou
- Genetics, Biotechnology, and Seed Science Unit (GBioS), Department of Plant Sciences, Faculty of Agronomic Sciences, University of Abomey Calavi, Cotonou, Benin
- Unit of Genetics and Plant Breeding (UGAP), Department of Plant Biology, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon
- Institute of Agricultural Research for Development, Centre de Recherche Agricole de Mbalmayo (CRAM), Mbalmayo, Cameroon
| | - Hermine Bille Ngalle
- Unit of Genetics and Plant Breeding (UGAP), Department of Plant Biology, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon
| | - David Cros
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Unité Mixte de Recherche (UMR) Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales (AGAP) Institut, Montpellier, France
- Unité Mixte de Recherche (UMR) Amélioration Génétique et Adaptation des Plantes méditerranéennes et tropicales (AGAP) Institut, University of Montpellier, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut Agro, Montpellier, France
| | - Charlotte O. A. Adje
- Genetics, Biotechnology, and Seed Science Unit (GBioS), Department of Plant Sciences, Faculty of Agronomic Sciences, University of Abomey Calavi, Cotonou, Benin
| | - Nicodeme V. H. Fassinou
- Genetics, Biotechnology, and Seed Science Unit (GBioS), Department of Plant Sciences, Faculty of Agronomic Sciences, University of Abomey Calavi, Cotonou, Benin
| | - Joseph Bell
- Unit of Genetics and Plant Breeding (UGAP), Department of Plant Biology, Faculty of Sciences, University of Yaoundé 1, Yaoundé, Cameroon
| | - Enoch G. Achigan-Dako
- Genetics, Biotechnology, and Seed Science Unit (GBioS), Department of Plant Sciences, Faculty of Agronomic Sciences, University of Abomey Calavi, Cotonou, Benin
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Infection by Pseudocercospora musae leads to an early reprogramming of the Musa paradisiaca defense transcriptome. 3 Biotech 2022; 12:177. [PMID: 35855477 PMCID: PMC9288577 DOI: 10.1007/s13205-022-03245-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 06/27/2022] [Indexed: 11/26/2022] Open
Abstract
Deep sequencing technologies such as RNA sequencing can help unravel mechanisms governing defense or resistance responses in plant-pathogen interactions. Several studies have been carried out to investigate the transcriptomic changes in Musa germplasm against Yellow Sigatoka disease, but the defense response of Musa paradisiaca has not been investigated so far. We carried out transcriptome sequencing of M. paradisiaca var. Kachkal infected with the pathogen Pseudocercospora musae and found that a vast set of genes were upregulated while many genes were downregulated in the resistant cultivar as a result of infection. After transcriptome assembly and differential gene expression analysis, 429 upregulated and 156 downregulated genes were filtered out (considering fold change ± 2, p < 0.01). Functional annotation of the differentially expressed genes (DEGs) enriched the upregulated genes into 49 gene ontology (GO) classes of biological processes (BP), 20 classes of molecular function (MF) and 9 classes of cellular component (CC). Similarly, the downregulated genes were classified into 35 GO classes of BP, 28 classes of MF and 6 classes of CC. The KEGG enrichment analysis revealed that the upregulated genes were most highly represented in 'metabolic' and 'biosynthesis of secondary metabolites' pathways. Additionally, 'plant hormone signal transduction', 'plant-pathogen interaction' and 'phenylpropanoid biosynthesis' pathways were also significantly enriched indicating their involvement in resistance responses against the pathogen. The RNA-seq analysis also depicts that a range of important defense-related genes are modulated as a result of infection, all of which are responsible for either mediating or activating resistance responses in the host. We studied and validated the expression profiles of ten important defense-related genes potentially involved in conferring resistance to the pathogen through qRT-PCR. Almost all the selected defense-related genes were found to be highly and significantly upregulated within 24 h post inoculation (hpi) and for some genes, the expression remained consistently high till the later time point of 72 hpi. These results, thus, indicate that the infection by P. musae leads to a rapid reprogramming of the defense transcriptome of the resistant banana cultivar. The defense-related genes identified to be modulated in response to infection are important not only for pathogen recognition and perception but also for activation and persistence of defense in the host. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-022-03245-9.
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The Mitochondrial Genome of a Plant Fungal Pathogen Pseudocercospora fijiensis (Mycosphaerellaceae), Comparative Analysis and Diversification Times of the Sigatoka Disease Complex Using Fossil Calibrated Phylogenies. Life (Basel) 2021; 11:life11030215. [PMID: 33803147 PMCID: PMC7999263 DOI: 10.3390/life11030215] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 02/08/2021] [Accepted: 02/08/2021] [Indexed: 12/26/2022] Open
Abstract
Mycosphaerellaceae is a highly diverse fungal family containing a variety of pathogens affecting many economically important crops. Mitochondria play a crucial role in fungal metabolism and in the study of fungal evolution. This study aims to: (i) describe the mitochondrial genome of Pseudocercospora fijiensis, and (ii) compare it with closely related species (Sphaerulina musiva, S. populicola, P. musae and P. eumusae) available online, paying particular attention to the Sigatoka disease’s complex causal agents. The mitochondrial genome of P. fijiensis is a circular molecule of 74,089 bp containing typical genes coding for the 14 proteins related to oxidative phosphorylation, 2 rRNA genes and a set of 38 tRNAs. P. fijiensis mitogenome has two truncated cox1 copies, and bicistronic transcription of nad2-nad3 and atp6-atp8 confirmed experimentally. Comparative analysis revealed high variability in size and gene order among selected Mycosphaerellaceae mitogenomes likely to be due to rearrangements caused by mobile intron invasion. Using fossil calibrated Bayesian phylogenies, we found later diversification times for Mycosphaerellaceae (66.6 MYA) and the Sigatoka disease complex causal agents, compared to previous strict molecular clock studies. An early divergent Pseudocercospora fijiensis split from the sister species P. musae + P. eumusae 13.31 MYA while their sister group, the sister species P. eumusae and P. musae, split from their shared common ancestor in the late Miocene 8.22 MYA. This newly dated phylogeny suggests that species belonging to the Sigatoka disease complex originated after wild relatives of domesticated bananas (section Eumusae; 27.9 MYA). During this time frame, mitochondrial genomes expanded significantly, possibly due to invasions of introns into different electron transport chain genes.
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Kimunye JN, Were E, Mussa F, Tazuba A, Jomanga K, Viljoen A, Swennen R, Muthoni FK, Mahuku G. Distribution of Pseudocercospora species causing Sigatoka leaf diseases of banana in Uganda and Tanzania. PLANT PATHOLOGY 2020; 69:50-59. [PMID: 31894162 PMCID: PMC6919302 DOI: 10.1111/ppa.13105] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/25/2019] [Accepted: 09/29/2019] [Indexed: 05/31/2023]
Abstract
Sigatoka leaf diseases are a major constraint to banana production. A survey was conducted in Tanzania and Uganda to assess the distribution of Pseudocercospora species and severity of Sigatoka leaf diseases. Pseudocercospora species were identified using species-specific primers. Sigatoka-like leaf diseases were observed in all farms and on all cultivars, but disease severity varied significantly (P < 0.001) between countries, districts/regions within countries, altitudinal ranges and banana cultivars. In all regions except Kilimanjaro, P. fijiensis, the causal agent of black Sigatoka, was the only pathogen associated with Sigatoka disease. Mycosphaerella musae was associated with Sigatoka-like symptoms in Kilimanjaro region. Black Sigatoka disease was more severe in Uganda, with a mean disease severity index (DSI) of 37.5%, than in Tanzania (DSI = 19.9%). In Uganda, black Sigatoka disease was equally severe in Luwero district (mean DSI = 40.4%) and Mbarara district (mean DSI = 37.9%). In Tanzania, black Sigatoka was most severe in Kagera region (mean DSI = 29.2%) and least in Mbeya region (mean DSI = 11.5%). Pseudocercospora fijiensis, the most devastating sigatoka pathogen, was detected at altitudes of up to 1877 m a.s.l. This range expansion of P. fijiensis, previously confined to altitudes lower than 1350 m a.s.l. in East Africa, is of concern, especially for smallholder banana farmers growing the susceptible East African Highland bananas (EAHB). Among the banana varieties sampled, the EAHB, FHIA hybrids and Mchare were the most susceptible. Here, the loss of resistance in Yangambi KM5, a banana variety previously resistant to P. fijiensis, is reported for the first time.
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Affiliation(s)
- J. N. Kimunye
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
- Department of Plant Pathology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
| | - E. Were
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
| | - F. Mussa
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
| | - A. Tazuba
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
| | - K. Jomanga
- International Institute of Tropical Agriculture (IITA), c/o Nelson Mandela African Institution of Science and Technology, Nelson Mandela Road, Arusha, Tanzania
| | - A. Viljoen
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
| | - R. Swennen
- International Institute of Tropical Agriculture (IITA), c/o Nelson Mandela African Institution of Science and Technology, Nelson Mandela Road, Arusha, Tanzania
- Laboratory of Tropical Crop Improvement, KU Leuven, Willem De Croylaan 42, 3001 Leuven, Belgium
| | | | - G. Mahuku
- International Institute of Tropical Agriculture, PO Box 7878, Kampala, Uganda
- International Institute of Tropical Agriculture (IITA), Dar es Salaam, PO Box 34441, Tanzania
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Cruz-Martín M, Acosta-Suárez M, Mena E, Roque B, Pichardo T, Alvarado-Capó Y. Effect of Bacillus pumilus CCIBP-C5 on Musa- Pseudocercospora fijiensis interaction. 3 Biotech 2018; 8:122. [PMID: 29450112 DOI: 10.1007/s13205-018-1152-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Accepted: 02/03/2018] [Indexed: 02/02/2023] Open
Abstract
The effect of antifungal activity of culture filtrate (CF) of Bacillus pumilus strain CCIBP-C5, an isolate from a phyllosphere of banana (Musa) leaves, was determined on Pseudocercospora fijiensis challenged banana plants. The CF was shown to decrease the fungal biomass and induce changes in banana plant. In this sense, at 70 days post inoculation (dpi), a lower infection index as well as a decrease in fungal biomass after 6 dpi was obtained in treated plants with respect to control ones. At the same time, changes in the activities of several enzymes related to plant defense responses, such as phenylalanine ammonia lyase, chitinases, β-1,3-glucanases and peroxidases were observed. These results indicate that B. pumilus CCIBP-C5 has a potential role for biological control of P. fijiensis possibly due to the production of antifungal metabolites.
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Affiliation(s)
- Mileidy Cruz-Martín
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
| | - Mayra Acosta-Suárez
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
| | - Eilyn Mena
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
| | - Berkis Roque
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
| | - Tatiana Pichardo
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
| | - Yelenys Alvarado-Capó
- Instituto de Biotecnología de las Plantas, Universidad Central "Marta Abreu" de Las Villas, Carretera a Camajuaní km 5.5, CP 54830 Santa Clara, Villa Clara Cuba
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Fungal Screening on Olive Oil for Extracellular Triacylglycerol Lipases: Selection of a Trichoderma harzianum Strain and Genome Wide Search for the Genes. Genes (Basel) 2018; 9:genes9020062. [PMID: 29370083 PMCID: PMC5852558 DOI: 10.3390/genes9020062] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/15/2017] [Accepted: 12/20/2017] [Indexed: 11/17/2022] Open
Abstract
A lipolytic screening with fungal strains isolated from lignocellulosic waste collected in banana plantation dumps was carried out. A Trichoderma harzianum strain (B13-1) showed good extracellular lipolytic activity (205 UmL−1). Subsequently, functional screening of the lipolytic activity on Rhodamine B enriched with olive oil as the only carbon source was performed. The successful growth of the strain allows us to suggest that a true lipase is responsible for the lipolytic activity in the B13-1 strain. In order to identify the gene(s) encoding the protein responsible for the lipolytic activity, in silico identification and characterization of triacylglycerol lipases from T. harzianum is reported for the first time. A survey in the genome of this fungus retrieved 50 lipases; however, bioinformatic analyses and putative functional descriptions in different databases allowed us to choose seven lipases as candidates. Suitability of the bioinformatic screening to select the candidates was confirmed by reverse transcription polymerase chain reaction (RT-PCR). The gene codifying 526309 was expressed when the fungus grew in a medium with olive oil as carbon source. This protein shares homology with commercial lipases, making it a candidate for further applications. The success in identifying a lipase gene inducible with olive oil and the suitability of the functional screening and bioinformatic survey carried out herein, support the premise that the strategy can be used in other microorganisms with sequenced genomes to search for true lipases, or other enzymes belonging to large protein families.
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Kurose D, Furuya N, Saeki T, Tsuchiya K, Tsushima S, Seier MK. Species-Specific Detection of Mycosphaerella polygoni-cuspidati as a Biological Control Agent for Fallopia japonica by PCR Assay. Mol Biotechnol 2016; 58:626-633. [PMID: 27389682 PMCID: PMC5429361 DOI: 10.1007/s12033-016-9962-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The ascomycete fungus Mycosphaerella polygoni-cuspidati has been undergoing evaluation as a potential classical biological control agent for the invasive weed Fallopia japonica (Japanese knotweed), which has become troublesome in Europe and North America. In advance of the potential release of a biocontrol agent into a new environment, it is crucial to develop an effective monitoring system to enable the evaluation of agent establishment and dispersal within the target host population, as well as any potential attacks on non-target species. Therefore, a primer pair was designed for direct, rapid, and specific detection of the Japanese knotweed pathogen M. polygoni-cuspidati based on the sequences of the internal transcribed spacer regions including the 5.8S rDNA. A PCR product of approximately 298 bp was obtained only when the DNA extracted from mycelial fragments of M. polygoni-cuspidati was used. The lower limit of detection of the PCR method was 100 fg of genomic DNA. Using the specific primer pair, M. polygoni-cuspidati could be detected from both naturally and artificially infected Japanese knotweed plants. No amplification was observed for other Mycosphaerella spp. or fungal endophytes isolated from F. japonica. The designed primer pair is thus effective for the specific detection of M. polygoni-cuspidati in planta.
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Affiliation(s)
- Daisuke Kurose
- CABI Europe-UK, Bakeham Lane, Egham, Surrey, TW20 9TY, UK.
| | - Naruto Furuya
- Laboratory of Plant Pathology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
| | - Tetsuya Saeki
- Laboratory of Plant Pathology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
| | - Kenichi Tsuchiya
- Laboratory of Plant Pathology, Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka, 812-8581, Japan
| | - Seiya Tsushima
- Plant Pathology Laboratory, Faculty of Agriculture, Tokyo University of Agriculture, 1737 Funako, Atsugi, Kanagawa, 243-0034, Japan
| | - Marion K Seier
- CABI Europe-UK, Bakeham Lane, Egham, Surrey, TW20 9TY, UK
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Efficient transformation of Mycosphaerella fijiensis by underwater shock waves. J Microbiol Methods 2015; 119:98-105. [DOI: 10.1016/j.mimet.2015.10.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Revised: 10/08/2015] [Accepted: 10/08/2015] [Indexed: 11/22/2022]
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Escobar-Tovar L, Guzmán-Quesada M, Sandoval-Fernández JA, Gómez-Lim MA. Comparative analysis of the in vitro and in planta secretomes from Mycosphaerella fijiensis isolates. Fungal Biol 2015; 119:447-70. [PMID: 25986542 DOI: 10.1016/j.funbio.2015.01.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 01/13/2015] [Accepted: 01/14/2015] [Indexed: 01/09/2023]
Abstract
Black Sigatoka, a devastating disease of bananas and plantains worldwide, is caused by the fungus Mycosphaerella fijiensis. Several banana cultivars such as 'Yangambi Km 5' and Calcutta IV, have been known to be resistant to the fungus, but the resistance has been broken in 'Yangambi Km 5' in Costa Rica. Since the resistance of this variety still persists in Mexico, the aim of this study was to compare the in vitro and in planta secretomes from two avirulent and virulent M. fijiensis isolates using proteomics and bioinformatics approaches. We aimed to identify differentially expressed proteins in fungal isolates that differ in pathogenicity and that might be responsible for breaking the resistance in 'Yangambi Km 5'. We were able to identify 90 protein spots in the secretomes of fungal isolates encoding 42 unique proteins and 35 differential spots between them. Proteins involved in carbohydrate transport and metabolism were more prevalent. Several proteases, pathogenicity-related, ROS detoxification and unknown proteins were also highly or specifically expressed by the virulent isolate in vitro or during in planta infection. An unknown protein representing a virulence factor candidate was also identified. These results demonstrated that the secretome reflects major differences between both M. fijiensis isolates.
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Affiliation(s)
- Lina Escobar-Tovar
- Departamento de Ingeniería Genética, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, 36821, Irapuato, Guanajuato, Mexico
| | - Mauricio Guzmán-Quesada
- Dirección de Investigaciones, Sección de Fitopatología, Corporación Bananera Nacional, 390-7210, La Rita, Guápiles, Costa Rica
| | - Jorge A Sandoval-Fernández
- Dirección de Investigaciones, Sección de Fitopatología, Corporación Bananera Nacional, 390-7210, La Rita, Guápiles, Costa Rica
| | - Miguel A Gómez-Lim
- Departamento de Ingeniería Genética, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, 36821, Irapuato, Guanajuato, Mexico.
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Braun U, Crous PW, Nakashima C. Cercosporoid fungi (Mycosphaerellaceae) 2. Species on monocots (Acoraceae to Xyridaceae, excluding Poaceae). IMA Fungus 2014; 5:203-390. [PMID: 25734029 PMCID: PMC4329321 DOI: 10.5598/imafungus.2014.05.02.04] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 10/31/2014] [Indexed: 10/30/2022] Open
Abstract
Cercosporoid fungi (formerly Cercospora s. lat.) represent one of the largest groups of hyphomycetes belonging to the Mycosphaerellaceae (Ascomycota). They include asexual morphs, asexual holomorphs, or species with mycosphaerella-like sexual morphs. Most of them are leaf-spotting plant pathogens with special phytopathological relevance. In the first part of a new monographic work, cercosporoid hyphomycetes occurring on other fungi (fungicolous species), on ferns (pteridophytes) and gymnosperms were treated. This second part deals with cercosporoid fungi on monocots (Liliopsida; Equisetopsida, Magnoliidae, Lilianae), which covers species occurring on host plants belonging to families arranged in alphabetical order from Acoraceae to Xyridaceae, excluding Poaceae (cereals and grasses) which requires a separate treatment. The species are described and illustrated in alphabetical order under the particular cercosporoid genera, supplemented by keys to the species concerned. A detailed introduction, a survey of currently recognised cercosporoid genera, a key to the genera concerned, and a discussion of taxonomically relevant characters were published in the first part of this series. Neopseudocercospora, an additional recently introduced cercosporoid genus, is briefly discussed. The following taxonomic novelties are introduced: Cercospora alpiniigena sp. nov., C. neomaricae sp. nov., Corynespora palmicola comb. nov., Exosporium miyakei comb. nov., E. petersii comb. nov., Neopseudocercospora zambiensis comb. nov., Passalora caladiicola comb. nov., P. streptopi comb. nov., P. togashiana comb. nov., P. tranzschelii var. chinensis var. nov., Pseudocercospora beaucarneae comb. nov., P. constrictoflexuosa comb. et stat. nov., P. curcumicola sp. nov., P. dispori comb. nov., P. smilacicola sp. nov., P. urariigena nom. nov., Zasmidium agavicola comb. nov., Z. cercestidis-afzelii comb. nov., Z. citri-griseum comb. nov., Z. cyrtopodii comb. nov., Z. gahnae comb. nov., Z. indicum comb. nov., Z. liriopes comb. nov., Z. mycovellosielloides sp. nov., Z. scleriae comb. nov., Z. smilacicola comb. nov., and Z. thaliae comb. nov.
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Affiliation(s)
- Uwe Braun
- Martin-Luther-Universität, Institut für Biologie, Bereich Geobotanik und Botanischer Garten, Herbarium, Neuwerk 21, 06099 Halle (Saale), Germany
| | - Pedro W. Crous
- CBS-KNAW, Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands
| | - Chiharu Nakashima
- Graduate School of Bioresources, Mie University, 1577 Kurima-machiya, Tsu, Mie 514-8507, Japan
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Gomes LIS, Douhan GW, Bibiano LBJ, Maffia LA, Mizubuti ESG. Mycosphaerella musicola Identified as the Only Pathogen of the Sigatoka Disease Complex Present in Minas Gerais State, Brazil. PLANT DISEASE 2013; 97:1537-1543. [PMID: 30716832 DOI: 10.1094/pdis-12-12-1212-re] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A thorough assessment of the distribution of Mycosphaerella spp. associated with banana in Minas Gerais State, Brazil, was conducted after Mycosphaerella fijiensis was first reported to occur in this region in 2005. From 2009 to 2011, 80 fields located in 20 municipalities including the same fields where the disease was first reported were sampled. A total of 800 samples of leaf tissue with symptoms similar to those of yellow or black Sigatoka diseases were examined, and 239 isolates were obtained. The identification of the fungi was based on morphological characters combined with DNA sequences obtained after amplification with species-specific primers and phylogeny inferred from the internal transcribed spacer region of Mycosphaerella strains from banana. All 239 isolates were identified as Mycosphaerella musicola. The absence of M. fijiensis in the samples may have been due to misidentification of M. fijiensis or the displacement of M. fijiensis by M. musicola. It is now apparent that yellow Sigatoka caused by M. musicola is the prevailing leaf spot disease of bananas in Minas Gerais State and that regulatory/legislative control measures need to be revised based on our findings.
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Affiliation(s)
- Lahyre Izaete S Gomes
- Departamento de Fitopatologia, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
| | - Greg W Douhan
- Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521
| | - Líllian B J Bibiano
- Departamento de Fitopatologia, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
| | - Luiz A Maffia
- Departamento de Fitopatologia, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
| | - Eduardo S G Mizubuti
- Departamento de Fitopatologia, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
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Portal O, Izquierdo Y, De Vleesschauwer D, Sánchez-Rodríguez A, Mendoza-Rodríguez M, Acosta-Suárez M, Ocaña B, Jiménez E, Höfte M. Analysis of expressed sequence tags derived from a compatible Mycosphaerella fijiensis-banana interaction. PLANT CELL REPORTS 2011; 30:913-28. [PMID: 21279642 DOI: 10.1007/s00299-011-1008-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 01/07/2011] [Accepted: 01/10/2011] [Indexed: 05/14/2023]
Abstract
Mycosphaerella fijiensis, a hemibiotrophic fungus, is the causal agent of black leaf streak disease, the most serious foliar disease of bananas and plantains. To analyze the compatible interaction of M. fijiensis with Musa spp., a suppression subtractive hybridization (SSH) cDNA library was constructed to identify transcripts induced at late stages of infection in the host and the pathogen. In addition, a full-length cDNA library was created from the same mRNA starting material as the SSH library. The SSH procedure was effective in identifying specific genes predicted to be involved in plant-fungal interactions and new information was obtained mainly about genes and pathways activated in the plant. Several plant genes predicted to be involved in the synthesis of phenylpropanoids and detoxification compounds were identified, as well as pathogenesis-related proteins that could be involved in the plant response against M. fijiensis infection. At late stages of infection, jasmonic acid and ethylene signaling transduction pathways appear to be active, which corresponds with the necrotrophic life style of M. fijiensis. Quantitative PCR experiments revealed that antifungal genes encoding PR proteins and GDSL-like lipase are only transiently induced 30 days post inoculation (dpi), indicating that the fungus is probably actively repressing plant defense. The only fungal gene found was induced 37 dpi and encodes UDP-glucose pyrophosphorylase, an enzyme involved in the biosynthesis of trehalose. Trehalose biosynthesis was probably induced in response to prior activation of plant antifungal genes and may act as an osmoprotectant against membrane damage.
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Affiliation(s)
- Orelvis Portal
- Instituto de Biotecnología de las Plantas, Universidad Central Marta Abreu de Las Villas, Carretera a Camajuaní km 5.5, 54 830, Santa Clara, Cuba
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13
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Churchill ACL. Mycosphaerella fijiensis, the black leaf streak pathogen of banana: progress towards understanding pathogen biology and detection, disease development, and the challenges of control. MOLECULAR PLANT PATHOLOGY 2011; 12:307-28. [PMID: 21453427 PMCID: PMC6640443 DOI: 10.1111/j.1364-3703.2010.00672.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
BACKGROUND Banana (Musa spp.) is grown throughout the tropical and subtropical regions of the world. The fruits are a key staple food in many developing countries and a source of income for subsistence farmers. Bananas are also a major, multibillion-dollar export commodity for consumption primarily in developed countries, where few banana cultivars are grown. The fungal pathogen Mycosphaerella fijiensis causes black leaf streak disease (BLSD; aka black Sigatoka leaf spot) on the majority of edible banana cultivars grown worldwide. The fact that most of these cultivars are sterile and unsuitable for the breeding of resistant lines necessitates the extensive use of fungicides as the primary means of disease control. BLSD is a significant threat to the food security of resource-poor populations who cannot afford fungicides, and increases the environmental and health hazards where large-acreage monocultures of banana (Cavendish subgroup, AAA genome) are grown for export. TAXONOMY Mycosphaerella fijiensis M. Morelet is a sexual, heterothallic fungus having Pseudocercospora fijiensis (M. Morelet) Deighton as the anamorph stage. It is a haploid, hemibiotrophic ascomycete within the class Dothideomycetes, order Capnodiales and family Mycosphaerellaceae. Its taxonomic placement is based on DNA phylogeny, morphological analyses and cultural characteristics. DISEASE SYMPTOMS AND HOST RANGE Mycosphaerella fijiensis is a leaf pathogen that causes reddish-brown streaks running parallel to the leaf veins, which aggregate to form larger, dark-brown to black compound streaks. These streaks eventually form fusiform or elliptical lesions that coalesce, form a water-soaked border with a yellow halo and, eventually, merge to cause extensive leaf necrosis. The disease does not kill the plants immediately, but weakens them by decreasing the photosynthetic capacity of leaves, causing a reduction in the quantity and quality of fruit, and inducing the premature ripening of fruit harvested from infected plants. Although Musa spp. are the primary hosts of M. fijiensis, the ornamental plant Heliconia psittacorum has been reported as an alternative host. NEW OPPORTUNITIES Several valuable tools and resources have been developed to overcome some of the challenges of studying this host-pathogen system. These include a DNA-mediated fungal transformation system and the ability to conduct targeted gene disruptions, reliable quantitative plant bioassays, diagnostic probes to detect and differentiate M. fijiensis from related pathogens and to distinguish strains of different mating types, and a genome sequence that has revealed a wealth of gene sequences and molecular markers to be utilized in functional and population biology studies. USEFUL WEBSITES http://bananas.bioversityinternational.org/, http://genome.jgi-psf.org/Mycfi2/Mycfi2.home.html, http://www.isppweb.org/names_banana_pathogen.asp#fun, http://www.promusa.org/.
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Affiliation(s)
- Alice C L Churchill
- Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, NY 14853, USA.
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Broders KD, Boland GJ. Molecular Diagnostic Assay for Detection of the Butternut Canker Pathogen Sirococcus clavigignenti-juglandacearum. PLANT DISEASE 2010; 94:952-958. [PMID: 30743478 DOI: 10.1094/pdis-94-8-0952] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Butternut canker, caused by the fungal pathogen Sirococcus clavigignenti-juglandacearum, is present throughout the range of butternut (Juglans cinerea) and is the primary cause for its decline. A quick and reliable method for identification of S. clavigignenti-juglandacearum would provide a valuable tool for the detection of the pathogen on propagative material to avoid spread, as well as assist studies targeted at the epidemiology of this pathogen, in particular the dissemination of the pathogen by seeds of the butternut. The objective of this study was to develop a diagnostic assay to detect S. clavigignenti-juglandacearum in butternut plant tissue. The primers were developed using an alignment of internal transcribed spacer (ITS) sequences from isolates of S. clavigignenti-juglandacearum and several closely related species. These primers were tested on J. cinerea, 48 isolates of S. clavigignenti-juglandacearum recovered from diseased trees, and 26 species of other fungi recovered from butternut tissue. The primers amplified a product from the DNA of all isolates of S. clavigignenti-juglandacearum, detected its DNA at a concentration as low as 1 pg/μl, and detected the pathogen at a concentration of 1 × 103 spore/ml. The primers developed in this study will be a valuable tool for the detection of S. clavigignenti-juglandacearum present on butternut seeds, and as a rapid diagnostic tool for early detection of the pathogen on butternut trees.
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Affiliation(s)
- K D Broders
- School of Environmental Sciences, University of Guelph, Guelph ON, Canada N1G 2W1
| | - G J Boland
- School of Environmental Sciences, University of Guelph, Guelph ON, Canada N1G 2W1
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15
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Schubert R, Bahnweg G, Nechwatal J, Jung T, Cooke DEL, Duncan JM, Müller‐Starck G, Langebartels C, Jr HS, Oßwald W. Detection and quantification ofPhytophthoraspecies which are associated with root‐rot diseases in European deciduous forests by species‐specific polymerase chain reaction. ACTA ACUST UNITED AC 2008. [DOI: 10.1046/j.1439-0329.1999.00141.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- R. Schubert
- Faculty of Forest Sciences, Section of Forest Genetics, Ludwig‐Maximilians‐University Munich, Am Hochanger 13, D‐85354 Freising, Germany (R. Schubert for correspondence)
| | - G. Bahnweg
- GSF‐National Research Center for Environment and Health, Institute of Biochemical Plant Pathology, Ingoldstädter Landstr. 1, D‐85764 Neuherberg, Germany
| | - J. Nechwatal
- Faculty of Forest Sciences, Institute of Forest Botany, Phytopathology, Ludwig‐Maximilians‐University Munich, Am Hochanger 13, D‐85354 Freising, Germany
| | - T. Jung
- Faculty of Forest Sciences, Institute of Forest Botany, Phytopathology, Ludwig‐Maximilians‐University Munich, Am Hochanger 13, D‐85354 Freising, Germany
| | - D. E. L. Cooke
- Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
| | - J. M. Duncan
- Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK
| | - G. Müller‐Starck
- Faculty of Forest Sciences, Section of Forest Genetics, Ludwig‐Maximilians‐University Munich, Am Hochanger 13, D‐85354 Freising, Germany (R. Schubert for correspondence)
| | - C. Langebartels
- GSF‐National Research Center for Environment and Health, Institute of Biochemical Plant Pathology, Ingoldstädter Landstr. 1, D‐85764 Neuherberg, Germany
| | - H. Sandermann Jr
- GSF‐National Research Center for Environment and Health, Institute of Biochemical Plant Pathology, Ingoldstädter Landstr. 1, D‐85764 Neuherberg, Germany
| | - W. Oßwald
- Faculty of Forest Sciences, Institute of Forest Botany, Phytopathology, Ludwig‐Maximilians‐University Munich, Am Hochanger 13, D‐85354 Freising, Germany
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Pest risk assessment made by France on Mycosphaerella fijiensis considered by France as harmful in French overseas departments of French Guiana, Guadeloupe, Martinique and Réunion ‐ Scientific Opinion of the Panel on Plant Health. EFSA J 2008. [DOI: 10.2903/j.efsa.2008.650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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17
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Canto-Canché B, Guillén-Maldonado DK, Peraza-Echeverría L, Conde-Ferráez L, James-Kay A. Construction and characterization of a bacterial artificial chromosome library of the causal agent of Black Sigatoka fungal leaf spot disease of banana and plantain, Mycosphaerella fijiensis. Mol Biotechnol 2007; 36:64-70. [PMID: 17827540 DOI: 10.1007/s12033-007-0016-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/1999] [Revised: 11/30/1999] [Accepted: 11/30/1999] [Indexed: 11/29/2022]
Abstract
A bacterial artificial chromosome library of the causal agent of the Black Sigatoka leaf spot disease of banana and plantain, Mycosphaerella fijiensis, has been constructed using a non-sphaeroplasting technique and characterized using both homologous and heterologous probes. After first and a second size selection of PFGE-fractionated DNA, a ligation was obtained using a 1:4 molar ratio (insert:vector). One hundred random clones were analyzed, and the mean insert size was estimated to be 90 kb. The range of the insert sizes was between 40 and 160 kb. The highest percentage of inserts belonged to the range between 80 and 100 kb; 32% of the inserts had 2 or 3 internal NotI sites. This library consists of 1920 clones, if the genomic size is at least 35 Mb, then this represents 4.9 x genome equivalents, which was supported by hybridization results with homologous and heterologous probes.
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Affiliation(s)
- Blondy Canto-Canché
- Centro de Investigación Científica de Yucatán, Unidad de Biotecnología, Calle 43 No. 130, Col. Chuburná de Hidalgo, Mérida, Yucatán, 97200, México
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18
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Arzanlou M, Abeln ECA, Kema GHJ, Waalwijk C, Carlier J, Vries ID, Guzmán M, Crous PW. Molecular diagnostics for the sigatoka disease complex of banana. PHYTOPATHOLOGY 2007; 97:1112-1118. [PMID: 18944176 DOI: 10.1094/phyto-97-9-1112] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ABSTRACT The Sigatoka disease complex of banana involves three related ascomycetous fungi, Mycosphaerella fijiensis, M. musicola, and M. eumusae. The exact distribution of these three species and their disease epidemiology remain unclear, because their symptoms and life cycles are rather similar. Disease diagnosis in the Mycosphaerella complex of banana is based on the presence of host symptoms and fungal fruiting structures, which hamper preventive management strategies. In the present study, we have developed rapid and robust species-specific molecular-based diagnostic tools for detection and quantification of M. fijiensis, M. musicola, and M. eumusae. Conventional species-specific polymerase chain reaction (PCR) primers were developed based on the actin gene that detected DNA at as little as 100, 1, and 10 pg/mul from M. fijiensis, M. musicola, and M. eumusae, respectively. Furthermore, TaqMan real-time quantitative PCR assays were developed based on the beta-tubulin gene and detected quantities of DNA as low as 1 pg/mul for each Mycosphaerella sp. from pure cultures and DNA at 1.6 pg/mul per milligram of dry leaf tissue for M. fijiensis that was validated using naturally infected banana leaves.
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Glen M, Smith AH, Langrell SRH, Mohammed CL. Development of Nested Polymerase Chain Reaction Detection of Mycosphaerella spp. and Its Application to the Study of Leaf Disease in Eucalyptus Plantations. PHYTOPATHOLOGY 2007; 97:132-144. [PMID: 18944368 DOI: 10.1094/phyto-97-2-0132] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
ABSTRACT Mycosphaerella leaf disease (MLD) is a serious disease of two of the major eucalypt species grown in temperate regions worldwide, Eucalyptus globulus and E. nitens. More than 30 species of Mycosphaerella have been reported on eucalypts worldwide. Accurate, rapid, and early discrimination of Mycosphaerella spp. causing crown damage to E. globulus and E. nitens will assist the development of sustainable management strategies. This study describes the development, and incorporation in a nested polymerase chain reaction (PCR) approach, of specific primers for the detection and identification of Mycosphaerella spp. commonly reported from leaf lesions of E. globulus and E. nitens in Australia. Primer design was assisted by sequence alignment and phylogenetic analysis of 165 nonredundant sequences from the nuclear ribosomal DNA internal transcribed spacer regions of Mycosphaerella and related species. Phylo-genetic analysis revealed very high sequence similarity for two taxon groups, Mycosphaerella grandis and M. parva, and M. vespa, M. ambi phylla, and M. molleriana, and primers were designed to differentiate each of the two groups. Three other species, M. cryptica, M. nubilosa, and M. tasmaniensis, were distinct and distinguished by species-specific primers. In double-blind trials, the detection test accurately and rapidly identified Mycosphaerella spp. in cultures and discriminated against other pathogens that co-occur in or on Eucalyptus leaves, thereby verifying its reliability. The detection test has an internal amplification control in the first-round PCR with fungal-specific primers to raise confidence in test results, particularly to highlight negative results due to PCR inhibition. When applied to DNA extracted from leaf or stem samples either as multiple or single lesions, it detected and identified up to five Mycosphaerella spp. or taxon groups in both positively identified and in young (putative) MLD lesions. The samples were 20 mm(2) or larger in surface area and were collected while undertaking disease rating assessments in an experimental investigation of Eucalyptus plantations and regrowth forest. Using nested PCR detection, Mycosphaerella spp. were positively identified in 2 days, 1 to 5 months earlier than by classical methods, demonstrating the potential application of this detection test to the early discrimination of MLD components in ecological, epidemiological, and genetic investigations.
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20
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Maxwell A, Jackson SL, Dell B, Hardy GESJ. PCR-identification of Mycosphaerella species associated with leaf diseases of Eucalyptus. ACTA ACUST UNITED AC 2005; 109:992-1004. [PMID: 16209305 DOI: 10.1017/s0953756205003539] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A PCR-based technique based on the ITS1-5.8s-ITS2 domain of the rRNA gene for identifying five species associated with Mycosphaerella leaf disease (MLD) of eucalypts was developed. Primer pairs MC2F and MC2R; ML1F and ML1R; MM1F and MM1R; MN1F and MN1R; and MP1F and MP1R amplified a product for DNA extracted from their single target species, those being M. cryptica, M. lateralis, M. marksii, M. nubilosa and M. parva, respectively. The possibility of false positive amplification by each primer pair was tested in reactions with DNA extracts from 16 other Mycosphaerella species associated with eucalypts and against non-infected Eucalyptus globulus leaves. Under the PCR conditions used, there were no false positive amplifications of the 16 non-target Mycosphaerella species, or from non-symptomatic E. globulus leaves for the primer pairs ML1F and ML1R; MM1F and MM1R; MN1F and MN1R; and MP1F and MP1R. The primer pair MC2F and MC2R amplified a 402 nt product from both the target M. crvptica and non-target M. nubilosa. However, these two species were differentiated by digesting the product with the restriction enzyme Sacc II which resulted in a single 402 nt product for M. cryptica, and two products of 78 and 324 nt for M. nubilosa. All of the primers were able to detect their target Mycosphaerella species from Eucalyptus globulus lesions. PCR reactions with these primers on DNA extracted from Mycosphaerella lesions confirmed the presence of all five species from leaf material collected from three plantations in Western Australia.
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Affiliation(s)
- Aaron Maxwell
- School of Biological Sciences and Biotechnology, Murdoch University, Perth, WA 6150, Australia.
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21
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Kularatne HAGC, Lawrie AC, Barber PA, Keane PJ. A specific primer PCR and RFLP assay for the rapid detection and differentiation in planta of some Mycosphaerella species associated with foliar diseases of Eucalyptus globulus. ACTA ACUST UNITED AC 2005; 108:1476-93. [PMID: 15757184 DOI: 10.1017/s0953756204000759] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
It is difficult to accurately identify Mycosphaerella species associated with leaf diseases of Eucalyptus based on morphological characters, as there is considerable overlap between very similar species and subspecies, and isolation from the host is not easy. Thus, a PCR and RFLP assay based on the ITS region of nr DNA was developed for the rapid detection and differentiation of M. nubilosa, M. cryptica and two non-sporing unidentified Mycosphaerella species isolated from the foliage of trees in resistant and susceptible families of E. globulus in a seed orchard at Kinglake West, Victoria, Australia. The M. nubilosa primer pair MNF/MNR was highly specific. A PCR-RFLP system based on the primer pair MCF/MCR, coupled with two restriction enzymes (DdeI and Tru1 I), differentiated M. cryptica, M. nubilosa, M. tasmaniensis and M. aff. vespa. One of the unidentified field-isolated Mycosphaerella species was identified as M. grandis on the basis of ITS sequence data while the other species remains unidentified. A PCR-RFLP system based on the primer pair U1F/U1R, coupled with the restriction enzyme StyI, differentiated between the two unidentified species. Unexpectedly, unlike isolation and culture studies, these assays detected M. nubilosa, M. cryptica and M. grandis in all single lesions examined on both juvenile and adult leaves, and on both highly resistant and highly susceptible E. globulus trees at this site.
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Affiliation(s)
- H A Geetha C Kularatne
- Department of Biotechnology and Environmental Biology, RMIT University, P.O. Box 71, Bundoora, VIC 3083, Australia
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22
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Chen W, Gray LE, Kurle JE, Grau CR. Specific detection ofPhialophora gregataandPlectosporium tabacinumin infected soybean plants using polymerase chain reaction. Mol Ecol 2002. [DOI: 10.1046/j.1365-294x.1999.00645.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Weidong Chen
- Illinois Natural History Survey, and Department of Crop Sciences, University of Illinois at Urbana‐Champaign, 607 East Peabody Drive, Champaign, IL 61820, USA,,
| | - Lynn E. Gray
- USDA‐ARS, Department of Crop Sciences, University of Illinois at Urbana‐Champaign, 1004 West Peabody Drive, Urbana, IL 61801, USA,,
| | - James E. Kurle
- Department of Plant Pathology, University of Wisconsin, 1630 Linden Drive, Madison, WI 53706, USA
| | - Craig R. Grau
- Department of Plant Pathology, University of Wisconsin, 1630 Linden Drive, Madison, WI 53706, USA
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The use of RAPD-PCR analysis for the differentiation of Mycosphaerella species from Eucalyptus in Australia. ACTA ACUST UNITED AC 2001. [DOI: 10.1017/s0953756201004762] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Guo LD, Hyde KD, Liew EC. Detection and taxonomic placement of endophytic fungi within frond tissues of Livistona chinensis based on rDNA sequences. Mol Phylogenet Evol 2001; 20:1-13. [PMID: 11421644 DOI: 10.1006/mpev.2001.0942] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The 5.8S gene and flanking internal transcribed spacers (ITS1 and ITS2) of the rDNA were amplified from total DNA extracted from frond tissues of Livistona chinensis with universal and fungal-specific primers. These amplified fragments were cloned and sequenced. Phylogenetic analysis based on the 5.8S gene sequences indicated that the six clone sequences obtained were of different origins. Five sequences, P1-9, P2-6, P4-4, P4-5, and P4-7, belonged to the fungi and one sequence, P3-2, belonged to the plants. P1-9 was inferred to belong to the Basidiomycota based on the phylogenetic analysis of the 5.8S gene sequences but could not be identified to lower taxonomic levels. Further identification of the other four fungal clones to lower taxonomic levels was attempted based on phylogenetic analysis and sequence comparison of both the conserved 5.8S gene and the variable ITS regions. The origin of P2-6 was identified to be Glomerella and its anamorph Colletotrichum, the origins of P4-5 and P4-7 were Mycosphaerella and its anamorph Cladosporium, and the origin of P4-4 was the Herpotrichiellaceae. The direct approach to detection and taxonomic placement of endophytic fungi within host tissue without the need for conventional in vitro culturing is discussed.
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Affiliation(s)
- L D Guo
- Centre for Research in Fungal Diversity, Department of Ecology and Biodiversity, The University of Hong Kong, Pokfulam Road, Hong Kong, S. A. R., China
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Balint-Kurti PJ, May GD, Churchill AC. Development of a transformation system for Mycosphaerella pathogens of banana: a tool for the study of host/pathogen interactions. FEMS Microbiol Lett 2001; 195:9-15. [PMID: 11166988 DOI: 10.1111/j.1574-6968.2001.tb10490.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
A genetic transformation system has been developed for three Mycosphaerella pathogens of banana and plantain (Musa spp.). Mycosphaerella fijiensis and Mycosphaerella musicola, the causal agents of black and yellow Sigatoka, respectively, and Mycosphaerella eumusae, which causes Septoria leaf spot of banana, were transformed with a construct carrying a synthetic gene encoding green fluorescent protein (GFP). Most single-spored transformants that expressed GFP constitutively were mitotically stable in the absence of selection for hygromycin B resistance. Transformants of all three species were pathogenic on the susceptible banana cultivar Grand Nain, and growth in planta was comparable to wild-type strains. GFP expression by transformants allowed us to observe extensive fungal growth within leaf tissue that eventually turned necrotic, at which point the fungi grew saprophytically on the dead tissue. Leaf chlorosis and necrosis were often observed in advance of saprophytic growth of the mycelium on necrotic tissue, which supports previous reports suggesting secretion of a phytotoxin.
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Affiliation(s)
- P J Balint-Kurti
- Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, NY 14853-1801, USA.
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Lee HK, Tewari JP, Turkington TK. A PCR-Based Assay to Detect Rhynchosporium secalis in Barley Seed. PLANT DISEASE 2001; 85:220-225. [PMID: 30831946 DOI: 10.1094/pdis.2001.85.2.220] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A polymerase chain reaction (PCR)-based diagnostic assay was developed to detect Rhynchosporium secalis, the barley scald fungus, in barley seed. Species-specific primers were designed based on sequence data of a region consisting of the 5.8S RNA gene and internal transcribed spacers 1 and 2 of R. secalis. The sequenced regions showed 100% homology between the two R. secalis isolates and 93% homology between R. secalis and R. orthosporum. Five sets of synthesized oligonucleotide primers were tested for their specificity using 29 isolates of R. secalis of diverse geographic origins and from different barley cultivars. In addition, DNA extracts from 22 species of microbes either taxonomically related to or from the same niche as R. secalis were tested as negative controls. Among five sets of primers, a primer set, RS8 and RS9, was selected for use in detecting R. secalis because it amplified a 264-bp fragment from the DNA of all R. secalis isolates but not the DNA from other species used for validation of the specificity of this primer set. This primer set was also used to detect R. secalis in barley seed and successfully amplified the predicted size of the DNA fragment in the infected material. PCR detection of as little as 1 to 10 pg of R. secalis DNA was possible. The method described here requires 1 day for completion, compared to 10 days required for the cultural method.
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Affiliation(s)
- H K Lee
- Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - J P Tewari
- Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - T K Turkington
- Agriculture and Agri-Food Canada, Lacombe Research Center, 6000 C and E Trail, Lacombe, AB T4L 1W1, Canada
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Pažoutová S, Bandyopadhyay R, Frederickson DE, Mantle PG, Frederiksen RA. Relations Among Sorghum Ergot Isolates from the Americas, Africa, India, and Australia. PLANT DISEASE 2000; 84:437-442. [PMID: 30841166 DOI: 10.1094/pdis.2000.84.4.437] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Sorghum ergot, initially restricted to Asia and Africa, was recently found in the Americas and Australia. Three species causing the disease have been reported: Claviceps sorghi in India, C. sorghicola in Japan, and C. africana in all ergot-positive countries. The objective of our study was to study the intraspecific variation in C. africana isolates in the Americas, Africa, India, and Australia. We confirmed C. africana, C. sorghi, and C. sorghicola as different species using differences in nucleotide sequences of internal transcribed spacer 1 and 5.8S rDNA regions. Sequences of this region obtained from the representative American, Indian, and Australian isolates of C. africana were identical. In addition, random amplified polymorphic DNA (RAPD) banding patterns of sorghum ergot pathogen isolates from the United States, Mexico, Puerto Rico, Bolivia, Australia, and India were evaluated with nearly 100 primers. A total of 65 primers gave identical patterns for all isolates, which confirmed that all were C. africana. The identity of RAPD pattern and rDNA sequence of Indian isolates with those of C. africana confirmed that the species is now present in India. Only 20 primers gave small pattern differences and 7 of them were used for routine testing. All of the American isolates were identical and three isolates of the same type were also found in South Africa, suggesting Africa as the origin of the invasion clone in the Americas. Australian and Indian isolates were distinguishable by a single band difference; therefore, migration from the Asian region to Australia is suspected. Another distinct group was found in Africa. Cluster analysis of the informative bands revealed that the American and African group are on the same moderately (69%) supported clade. Isolates from Australia and India belonged to another clade.
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Affiliation(s)
- Sylvie Pažoutová
- Institute of Microbiology Czech Academy of Sciences, Laboratory of the Physiology and Genetics of Filamentous Fungi, Videnska 1083, 142 20 Prague 4, Czech Republic
| | - Ranajit Bandyopadhyay
- Genetic Resources and Enhancement Program, International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Andhra Pradesh 502 324, India
| | | | - Peter G Mantle
- Imperial College of Science, Technology and Medicine, Department of Biochemistry, London, SW7 2AY, UK
| | - Richard A Frederiksen
- Department of Plant Pathology and Microbiology, 120 L. F. Peterson Building, Texas A&M University, College Station 77843
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Guzmán P, Gepts P, Temple S, Mkandawire ABC, Gilbertson RL. Detection and Differentiation of Phaeoisariopsis griseola Isolates with the Polymerase Chain Reaction and Group-Specific Primers. PLANT DISEASE 1999; 83:37-42. [PMID: 30845436 DOI: 10.1094/pdis.1999.83.1.37] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Specific detection of the two major groups of Phaeoisariopsis griseola(Andean and Mesoamerican) from infected common bean (Phaseolus vulgaris) leaves was achieved by amplification of different-sized DNA fragments with polymerase chain reaction (PCR) using group-specific primer pairs. These primer pairs were designed based on DNA sequences of cloned random amplified polymorphic DNA (RAPD) fragments. Using this method, P. griseola isolates from diverse geographical regions (five countries) were differentiated into the two previously established groups. Various sources of fungal tissue and DNA extraction methods were tested in order to develop a rapid PCR-based method to detect and differentiate P. griseola isolates. A simple and rapid sonication method was developed that allowed for PCR detection of P. griseola from mycelia or synnemata and conidia collected from angular leaf spot lesions on bean leaves.
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Affiliation(s)
| | - P Gepts
- Department of Agronomy and Range Science, University of California, Davis
| | - S Temple
- Department of Agronomy and Range Science, University of California, Davis
| | | | - R L Gilbertson
- Department of Plant Pathology, University of California, Davis 95616
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Groppe K, Boller T. PCR assay based on a microsatellite-containing locus for detection and quantification of Epichloë endophytes in grass tissue. Appl Environ Microbiol 1997; 63:1543-50. [PMID: 9097449 PMCID: PMC168446 DOI: 10.1128/aem.63.4.1543-1550.1997] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
A PCR assay which allows detection and quantification of Epichloë endophytes in tissues of the grass Bromus erectus is described. PCR with specific primers flanking a microsatellite-containing locus (MS primers) amplified fragments 300 to 400 bp in length from as little as 1.0 pg of fungal genomic DNA in 100 ng of DNA from infected plant material. When annealing temperatures were optimized, all Epichloë and Acremonium strains tested, representing many of the known taxonomic groups, yielded an amplification product, indicating that the MS primers may be useful for in planta detection of a variety of related species, including agronomically important Acremonium coenophialum and Acremonium lolii. No fragments were generated from DNA isolates from uninfected plant material or from unrelated fungi isolated from B. erectus. For diagnostic applications, a B. erectus-specific primer pair was designed for use in multiplex PCR to allow simultaneous amplification of plant and fungal DNA sequences, providing an internal control for PCR failure caused by inhibitory plant compounds present in DNA extracts. For quantitative applications, a heterologous control template in primer binding sites complementary to the MS primers was constructed for use in competitive PCR, allowing direct quantification of Epichloë in plant DNA extracts. The fungal DNA present in infected leaves of B. erectus between 1 and 20 pg per 100 ng of leaf DNA, but the amounts of fungal DNA present in the sheath and blade of a given leaf were correlated, indicating that the degree of infection varied between plant individuals but that leaves were colonized in a uniform way.
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Affiliation(s)
- K Groppe
- Botanisches Institut, Universität Basel, Switzerland.
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Abstract
To develop efficient control measures against fungal plant pathogens, the dynamics of host plant colonization during disease development and the interactions among fungi within host plant tissues need to be clarified. These studies require accurate quantitative estimation of specific fungal biomass in plant tissues. This has been approached by direct-microscopic methods, cultural methods, chemical determinations of fungal components, serological methods, and molecular methods. Among these methods, serological and molecular methods provide rapid, specific, and sensitive quantitative measures of fungal biomass in host plant tissues. Therefore, studies on fungal dynamics of host plant colonization using these two methods are presented. Some examples of species interactions among pathogenic fungi within host plants, such as synergism and competition, are reviewed and the usefulness of serological and molecular methods for studies on these interactions is presented. These quantitative methods will provide helpful information for understanding the ecology of plant pathogenic fungi, such as the dynamics of host plant colonization and species interactions. Key words: quantitative methods, fungal biomass, ELISA, PCR, fungal colonization, species interaction.
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