Occurrence and genetic and pathogenic characterisation of Pyrenophora teres f. teres, P. teres f. maculata and their hybrids

PhD Thesis


Poudel, Barsha. 2018. Occurrence and genetic and pathogenic characterisation of Pyrenophora teres f. teres, P. teres f. maculata and their hybrids. PhD Thesis Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/5c0da9c4f69d0
Title

Occurrence and genetic and pathogenic characterisation of
Pyrenophora teres f. teres, P. teres f. maculata and
their hybrids

TypePhD Thesis
Authors
AuthorPoudel, Barsha
SupervisorMartin, Anke
Sutherland, Mark W.
McLean, Mark S.
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages136
Year2018
Digital Object Identifier (DOI)https://doi.org/10.26192/5c0da9c4f69d0
Abstract

Pyrenophora teres is the causal agent of net blotches, which are important foliar diseases of barley (Hordeum vulgare) worldwide. Pyrenophora teres has two forms, P. teres f. teres (Ptt) and P. teres f. maculata (Ptm), which causes the net and spot forms respectively based on the symptoms that they induce on barley. The life cycles of both forms are almost identical in which they can undergo both sexual and asexual reproduction. Sexual reproduction contributes to genetic and pathogenic evolution and provides challenges for development of commercial resistant cultivars. It is necessary to understand the genetic and pathogenic diversity of P. teres to effectively breed commercial barley cultivars with resistance. This will improve productivity for barley growers and industry and help reduce reliance on chemical fungicides.

The two forms of P. teres consist of different virulence genes. Sexual recombination between two forms of P. teres provides a potential threat to breeding for resistance as it may result in combination of virulences from the two forms. Hybrids have been reported occasionally in the field. This study was conducted to investigate the frequency of Ptt x Ptm hybrid development in the field where both forms of P. teres co-exist. For this purpose, three field trial sites were established for three successive years and Ptt and Ptm of opposite mating types were inoculated to facilitate hybridisation. In addition, samples collected from barley growing regions in Australia during 1976–2015 were analysed. To identify hybrids between the two forms, twelve Ptt and Ptm specific markers were developed using a whole genome comparative approach. These markers provided a more efficient and robust method than previously developed markers for identification of hybrids. No Ptt x Ptm hybrids were identified in the collected samples. This indicates that sexual recombination between the two forms of P. teres was rare, even where conditions were conducive. Further, pre- and postmating barriers which may be responsible for reproductive isolation between Ptt and Ptm were reviewed.

A thorough knowledge of the degree of genetic variation in the pathogen is important for successful deployment of resistance genes in barley breeding. Genetic changes occurring in Ptt populations during a three year period was investigated using diversity array technology markers. In the field new genotypes were identified together with the original inoculated isolates in the first year of the cropping season. This indicated clonal reproduction and migration event. In two subsequent years, high number of recombinant genotypes were identified which indicated that gene flow combined with sexual recombination plays a prominent role in rapidly changing the structure of Ptt populations.

Barley grass (H. leporinum) is an alternative host to P. teres and can harbour virulent pathotypes of P. teres which can infect barley cultivars. Genetic diversity between P. teres collected from barley grass and barley showed that P. teres from the respective host were distinct, which suggested genetic isolation. Pathogenicity assay result showed that virulent P. teres from barley grass were avirulent on barley. This indicated that barley grass contributes little to the genetics of the P. teres population and negligible risk to commercial barley cultivars although the two hosts are often grown in close proximity.

In summary, this study investigated several areas of research to better understand and manage net blotch resistance in future. Further research to investigate mating barriers responsible for reproductive isolation between two forms of P. teres is important to understand the evolution of the pathogen. In addition, identification of virulent/avirulent genes is required to understand virulence mechanism of the pathogen and its interaction with the barley host.

KeywordsPyrenophora teres, barley diseases, formspecific PCR markers, population genetics, barley grass, hybridisation
ANZSRC Field of Research 2020310805. Plant pathology
300409. Crop and pasture protection (incl. pests, diseases and weeds)
310599. Genetics not elsewhere classified
Byline AffiliationsCentre for Crop Health
Permalink -

https://research.usq.edu.au/item/q4x25/occurrence-and-genetic-and-pathogenic-characterisation-of-pyrenophora-teres-f-teres-p-teres-f-maculata-and-their-hybrids

Download files


Published Version
Poudel_2018_wole.pdf
File access level: Anyone

  • 467
    total views
  • 343
    total downloads
  • 1
    views this month
  • 2
    downloads this month

Export as

Related outputs

Taxonomy of Macrophomina—traditional to molecular approaches
Poudel, Barsha and Vaghefi, Niloofar. 2023. "Taxonomy of Macrophomina—traditional to molecular approaches." Kumar, Pankaj and Dubey, Ramesh Chandra (ed.) Macrophomina Phaseolina: Ecobiology, Pathology and Management. United Kingdom. Elsevier. pp. 3-8
Phenotypic and genotypic diversity of Puccinia sorghi in Eastern Australia: implications for maize breeding programs
Quade, Aurelie, Park, Robert F., Stodart, Benjamin, Ding, Yi, Zhang, Peng, Thang, Mike, Poudel, Barsha, Vaghefi, Niloofar and Ash, Gavin James. 2023. "Phenotypic and genotypic diversity of Puccinia sorghi in Eastern Australia: implications for maize breeding programs ." PhytoFrontiers. 3 (3), pp. 610-618. https://doi.org/10.1094/PHYTOFR-12-22-0151-R
IMA Genome - F16 Draft genome assemblies of Fusarium marasasianum, Huntiella abstrusa, two Immersiporthe knoxdaviesiana isolates, Macrophomina pseudophaseolina, Macrophomina phaseolina, Naganishia randhawae, and Pseudocercospora cruenta
Wingfield, Brenda D., De Vos, Lieschen, Wilson, Andi M., Duong, Tuan A., Vaghefi, Niloofar, Botes, Angela, Kharwar, Ravindra Nath, Chand, Ramesh, Poudel, Barsha, Aliyu, Habibu, Barbetti, Martin J., Chen, ShuaiFei, de Maayer, Pieter, Liu, FeiFei, Navathe, Sudhir, Sinha, Shagun, Steenkamp, Emma T., Suzuki, Hiroyuki, Tshisekedi, Kalonji A., ..., Wingfield, Michael J.. 2022. "IMA Genome - F16 Draft genome assemblies of Fusarium marasasianum, Huntiella abstrusa, two Immersiporthe knoxdaviesiana isolates, Macrophomina pseudophaseolina, Macrophomina phaseolina, Naganishia randhawae, and Pseudocercospora cruenta." IMA Fungus: the global mycological journal. 13 (1), pp. 1-22. https://doi.org/10.1186/s43008-022-00089-z
The First Annotated Genome Assembly of Macrophomina tecta Associated with Charcoal Rot of Sorghum
Poudel, Barsha, Purushotham, Neeraj, Jones, Ashley, Nasim, Jamila, Adorada, Dante L., Sparks, Adam H., Schwessinger, Benjamin and Vaghefi, Niloofar. 2022. "The First Annotated Genome Assembly of Macrophomina tecta Associated with Charcoal Rot of Sorghum." Genome Biology and Evolution. 14 (6), pp. 1-7. https://doi.org/10.1093/gbe/evac081
Whole-Genome Data from Curtobacterium flaccumfaciens pv. flaccumfaciens Strains Associated with Tan Spot of Mungbean and Soybean Reveal Diverse Plasmid Profiles
Vaghefi, Niloofar, Adorada, Dante L., Huth, Lauren, Kelly, Lisa A., Poudel, Barsha, Young, Anthony and Sparks, Adam H.. 2021. "Whole-Genome Data from Curtobacterium flaccumfaciens pv. flaccumfaciens Strains Associated with Tan Spot of Mungbean and Soybean Reveal Diverse Plasmid Profiles." Molecular Plant-Microbe Interactions. 34 (10), pp. 1216-1222. https://doi.org/10.1094/MPMI-05-21-0116-A
IMA genome‑F17: Draft genome sequences of an Armillaria species from Zimbabwe, Ceratocystis colombiana, Elsinoë necatrix, Rosellinia necatrix, two genomes of Sclerotinia minor, short‑read genome assemblies and annotations of four Pyrenophora teres isolates from barley grass, and a long-read genome assembly of Cercospora zeina
Wingfield, Brenda D., Berger, Dave K., Coetzee, Martin P. A., Duong, Tuan A., Martin, Anke, Pham, Nam Q., van denBerg, Noelani, Wilken, P. Markus, Arun‑Chinnappa, Kiruba Shankari., Barnes, Irene, Buthelezi, Sikelela, Dahanayaka, Buddhika Amarasinghe, Durán, Alvaro, Engelbrecht, Juanita, Feurtey, Alice, Fourie, Arista, Fourie, Gerda, Hartley, Jesse, Kabwe, Eugene N. K., ..., Wingfield, Michael J.. 2022. "IMA genome‑F17: Draft genome sequences of an Armillaria species from Zimbabwe, Ceratocystis colombiana, Elsinoë necatrix, Rosellinia necatrix, two genomes of Sclerotinia minor, short‑read genome assemblies and annotations of four Pyrenophora teres isolates from barley grass, and a long-read genome assembly of Cercospora zeina ." IMA Fungus: the global mycological journal. 13 (1). https://doi.org/10.1186/s43008-022-00104-3
IMA Genome - F15: Draft genome assembly of Fusarium pilosicola, Meredithiella fracta, Niebla homalea, Pyrenophora teres hybrid WAC10721, and Teratosphaeria viscida
Duong, Tuan Anh, Aylward, Janneke, Ametrano, Claudio Gennaro, Poudel, Barsha, Santana, Quentin Carlo, Wilken, Pieter Markus, Martin, Anke, Arun‑Chinnappa, Kiruba Shankari, De Vos, Lieschen, DiStefano, Isabel, Grewe, Felix, Huhndorf, Sabine, Lumbsch, Helge Thorsten, Rakoma, Jostina Raesetsa, Poudel, Barsha, Steenkamp, Emma Theodora, Sun, Yukun, van der Nest, Magriet A., Wingfeld, Michael John, ..., Wingfeld, Brenda Diana. 2021. "IMA Genome - F15: Draft genome assembly of Fusarium pilosicola, Meredithiella fracta, Niebla homalea, Pyrenophora teres hybrid WAC10721, and Teratosphaeria viscida." IMA Fungus: the global mycological journal. 12 (1), pp. 1-17. https://doi.org/10.1186/s43008-021-00077-9
Advances in understanding the epidemiology, molecular biology and control of net blotch and the net blotch barley interaction
Martin, Anke, Poudel, Barsha, Dahanayaka, Buddhika Amarasinghe, McLean, Mark S., Snyman, Lisle and Lopez-Ruiz, Franciso J.. 2021. "Advances in understanding the epidemiology, molecular biology and control of net blotch and the net blotch barley interaction." Oliver, Richard (ed.) Achieving durable disease resistance in cereals. Burleigh Dodds Science Publishing Limited. pp. 477-514
Hidden diversity of Macrophomina associated with broadacre and horticultural crops in Australia
Poudel, Barsha, Shivas, Roger G., Adorada, Dante L., Barbetti, Martin J., Bithell, Sean L., Kelly, Lisa A., Moore, Natalie, Sparks, Adam H., Tan, Yu Pei, Thomas, Geoff, van Leur, Joop and Vaghefi, Niloofar. 2021. "Hidden diversity of Macrophomina associated with broadacre and horticultural crops in Australia." European Journal of Plant Pathology. 161, pp. 1-23. https://doi.org/10.1007/s10658-021-02300-0
Bioinformatics Data of Fungal Pathogens
Poudel, Barsha. Bioinformatics Data of Fungal Pathogens. Toowoomba. https://doi.org/10.26192/MEFW-EM74
Draft genome resource for Macrophomina phaseolina associated with charcoal rot in sorghum
Purushotham, Neeraj, Jones, Ashley, Poudel, Barsha, Nasim, Jamila, Adorada, Dante, Sparks, Adam, Schwessinger, Benjamin and Vaghefi, Niloofar. 2020. "Draft genome resource for Macrophomina phaseolina associated with charcoal rot in sorghum." Molecular Plant-Microbe Interactions. 33 (5), pp. 724-726. https://doi.org/10.1094/MPMI-12-19-0356-A
Genetic structure of a Pyrenophora teres f. teres population over time in an Australian barley field as revealed by Diversity Arrays Technology markers
Poudel, B., Vaghefi, N., McLean, M. S., Platz, G. J., Sutherland, M. W. and Martin, Anke. 2019. "Genetic structure of a Pyrenophora teres f. teres population over time in an Australian barley field as revealed by Diversity Arrays Technology markers." Plant Pathology. 68 (7), pp. 1331-1336. https://doi.org/10.1111/ppa.13035
Investigating hybridisation between the forms of Pyrenophora teres based on Australian barley field experiments and cultural collections
Poudel, B., McLean, M. S., Platz, G. J., McIlroy, J. A., Sutherland, M. W. and Martin, A.. 2019. "Investigating hybridisation between the forms of Pyrenophora teres based on Australian barley field experiments and cultural collections." European Journal of Plant Pathology. 153 (2), pp. 465-473. https://doi.org/10.1007/s10658-018-1574-9
Rare Pyrenophora teres hybridization events revealed by development of sequence-specific PCR markers
Poudel, Barsha, Ellwood, Simon R., Testa, Alison C., McLean, Mark, Sutherland, Mark and Martin, Anke. 2017. "Rare Pyrenophora teres hybridization events revealed by development of sequence-specific PCR markers." Phytopathology: International Journal of the American Phytopathological Society. 107 (7), pp. 878-884. https://doi.org/10.1094/PHYTO-11-16-0396-R
Whole-genome characterization of chemoresistant ovarian cancer
Patch, Ann-Marie, Christie, Elizabeth L., Etemadmoghadam, Dariush, Garsed, Dale W., George, Joshy, Fereday, Sian, Nones, Katia, Cowin, Prue, Alsop, Kathryn, Bailey, Peter J., Kassahn, Karin S., Newell, Felicity, Quinn, Michael C. J., Kazakoff, Stephen, Quek, Kelly, Wilhelm-Benartzi, Charlotte, Curry, Ed, Leong, Huei San, Hamilton, Anne, ..., Bowtell, David D. L.. 2015. "Whole-genome characterization of chemoresistant ovarian cancer." Nature. 521 (7553), pp. 489-494. https://doi.org/10.1038/nature14410
Whole genomes redefine the mutational landscape of pancreatic cancer
Waddell, Nicola, Pajic, Marina, Patch, Ann-Marie, Chang, David K., Kassahn, Karin S., Bailey, Peter, Johns, Amber L., Miller, David, Nones, Katia, Quek, Kelly, Quinn, Michael C. J., Robertson, Alan J., Fadlullah, Muhammad Z. H., Bruxner, Tim J. C., Christ, Angelika N., Harliwong, Ivon, Idrisoglu, Senel, Manning, Suzanne, Nourse, Craig, ..., Grimmond, Sean M.. 2015. "Whole genomes redefine the mutational landscape of pancreatic cancer." Nature. 518 (7540), pp. 495-501. https://doi.org/10.1038/nature14169