Identification of QTL for Resistance Against Two Fungal Pathogens, Pyrenophora Teres F
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Fluturë Novakazi Institut für Resistenzforschung und Stresstoleranz Identification of QTL for resistance against two fungal pathogens, Pyrenophora teres f. teres and Bipolaris sorokiniana, in a barley (Hordeum vulgare L.) diversity set Dissertationen aus dem Julius Kühn-Institut Julius Kühn-Institut Bundesforschungsinstitut für Kulturpflanzen Kontakt | Contact: Fluturë Novakazi Beethovenstraße 24 18069 Rostock Die Schriftenreihe ,,Dissertationen aus dem Julius Kühn-lnstitut“ veröffentlicht Doktorarbeiten, die in enger Zusammenarbeit mit Universitäten an lnstituten des Julius Kühn-lnstituts entstan- den sind. The publication series „Dissertationen aus dem Julius Kühn-lnstitut“ publishes doctoral disser- tations originating from research doctorates and completed at the Julius Kühn-Institut (JKI) either in close collaboration with universities or as an outstanding independent work in the JKI research fields. 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Bibliografische Information der Deutschen Nationalbibliothek Die Deutsche Nationalbibliothek verzeichnet diese Publikation In der Deutschen Nationalbibliografie: detaillierte bibliografische Daten sind im lnternet über http://dnb.d-nb.de abrufbar. Bibliographic information published by the Deutsche Nationalbibliothek (German National Library) The Deutsche Nationalbibliothek lists this publication in the Deutsche Nationalbibliografie; detailed bibliographic data are available in the Internet at http://dnb.dnb.de. ISBN 978-3-95547-097-5 DOI 10.5073/dissjki.2020.006 Herausgeber l Editor Julius Kühn-lnstitut, Bundesforschungsinstitut für Kulturpflanzen, Quedlinburg, Deutschland Julius Kühn-lnstitut, Federal Research Centre for Cultivated Plants, Quedlinburg, Germany © Der Autor/ Die Autorin 2020. Dieses Werk wird unter den Bedingungen der Creative Commons Namensnennung 4.0 International Lizenz (CC BY 4.0) zur Verfügung gestellt (https://creativecommons.org/licenses/by/4.0/deed.de). © The Author(s) 2020. This work is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/deed.en). Institute of Agronomy and Plant Breeding I, Department of Plant Breeding, Justus Liebig University, Giessen and Institute for Resistance Research and Stress Tolerance, Julius Kühn-Institute, Federal Research Centre for Cultivated Plants, Quedlinburg ___________________________________________________________________________ Identification of QTL for resistance against two fungal pathogens, Pyrenophora teres f. teres and Bipolaris sorokiniana, in a barley (Hordeum vulgare L.) diversity set ___________________________________________________________________________ Inaugural Dissertation for a Doctorate Degree in Agricultural Sciences - Dr. agr - In the Faculty Agricultural Sciences, Nutritional Sciences and Environmental Management Submitted by Fluturë Novakazi born in Prishtina, Kosovo Giessen 2020 Approved by the Faculty Agricultural Sciences, Nutritional Sciences and Environmental Management, Justus Liebig University Giessen Examining Committee: First Reviewer: Prof. Dr. Rod Snowdon Second Reviewer: Prof. Dr. Frank Ordon Examiner: Prof. Dr. Matthias Frisch Examiner: PD Dr. Annaliese Mason Chair of the Examining Committee: Prof. Dr. Gesine Lühken Date of Defence: May 11th , 2020 “So long, and thanks for all the fish.“ Douglas Adams Contents List of abbreviations II List of publications V 1 Summary 1 2 Introduction 3 2.1 Barley 3 2.2 Net Blotch of Barley 7 2.3 Spot Blotch of Barley 12 2.4 Marker systems and genome-wide association studies 14 3 Aims 20 4 Genetic analysis of a worldwide barley collection for resistance to net form of net blotch disease (Pyrenophora teres f. teres) 21 5 Genome-wide association studies in a barley diversity set reveal a limited number of loci for resistance to spot blotch 40 6 Discussion 56 6.1 Candidate genes located in regions identified for net blotch resistance 56 6.2 Resistant accessions 66 References 71 Appendix VII Contributions to meetings and conferences XLVI Acknowledgement XLVIII Erklärung XLIX ~ I ~ List of abbreviations List of abbreviations °C degree Celsius AFLP amplified fragment length polymorphism apaf apoptotic protease-activating factor Avr gene avirulence gene bp base pairs Bs Bipolaris sorokiniana Btr1/ 2 brittle rachis gene CC-NBS-LRR/ CNL coiled-coil nucleotide binding site LRR DNA deoxyribonucleic acid Eam8 early maturity 8 gene ET ethylene ETI effector triggered immunity GBS genotyping-by-sequencing GWAS genome-wide association studies h hours HC gene high-confidence gene HR hypersensitive response HSP heat shock protein IBSC International Barley genome Sequencing Consortium JA jasmonic acid K kinship LC gene low-confidence gene LD linkage disequilibrium LRR leucine-rich repeat ~ II ~ List of abbreviations MAGIC multi-parent advanced generation inter-cross MAMPs microbe-associated molecular patterns MAPK mitogen-activated protein kinase MAS marker-assisted selection Mat-a Praematurum-a gene Mbp mega base pairs Mlo mildew resistance locus o MTA marker-trait association NADPH nicotinamide adenine dinucleotide phosphate NAM nested association mapping NB nucleotide-binding NETS necrotrophic effector-triggered susceptibility NFNB net form of net blotch NGS next generation sequencing NO nitric oxide NPR1 non-expressor of pathogen-related nud nudum/ naked kernel gene PAMPs pathogen-associated molecular patterns PCA principle component analysis PCD programmed cell death PCR polymerase chain reaction Ppd-H1 Photoperiod-H1 gene PR proteins pathogenesis-related proteins PRR pattern recognition receptors PTI pattern triggered immunity Ptm Pyrenophora teres f. maculata ~ III ~ List of abbreviations Ptt Pyrenophora teres f. teres Q-matrix population structure matrix qPCR quantitative PCR QTL quantitative trait locus R gene resistance gene R protein disease resistance protein RAPD randomly amplified polymorphic DNA RFLP restriction fragment length polymorphism ROS reactive oxygen species RT-PCR real time PCR SA salicylic acid SAR systemic acquired resistance SFNB spot form of net blotch SNP single nucleotide polymorphism SSR simple sequence repeats TF transcription factor thresh-1 threshability gene TIR-NBS-LRR/ TNL toll interleukin receptor nucleotide binding site LRR Vrn vernalisation gene Vrs1 six-rowed spike gene ~ IV ~ List of publications List of publications This thesis is based on the following peer-reviewed publications: Novakazi F, Afanasenko O, Anisimova A, Platz GJ, Snowdon R, Kovaleva O, Zubkovich A, Ordon F, 2019. Genetic analysis of a worldwide barley collection for resistance to net form of net blotch disease (Pyrenophora teres f. teres). Theoretical and Applied Genetics, 132 (9): 2633-2650, https://doi.org/10.1007/s00122-019-03378-1. Novakazi F, Afanasenko O, Lashina N, Platz GJ, Snowdon R, Loskutov I, Ordon F, 2019. Genome- wide association studies in a barley (Hordeum vulgare) diversity set reveal a limited number of loci for resistance to spot blotch (Bipolaris sorokiniana). Plant Breeding, 00: 1-15, https://doi.org/10.1111/pbr.12792. ~ V ~ List of publications ~ VI ~ Summary 1 Summary Barley is worldwide the fourth most important cereal crop and is cultivated in near desert to sub- arctic conditions. The majority of production, around 70 %, is used for animal feed, 20 % are used for malting and the rest for human consumption, with regional differences. Pests and diseases constantly result in high yield losses. Two worldwide important fungal foliar diseases of barley are Pyrenophora teres f. teres (Ptt) and Bipolaris sorokiniana (Bs), the causal agents of net blotch and spot blotch, respectively. Yield losses are on average around 40 % and can amount to over 70 % in years with epidemics. Both pathogens are highly variable and the occurrence of new pathogenic strains demands for breeding of resistant cultivars. In order to identify new resistance sources, a diverse barley set comprising 449 accessions originating from over 50 different regions all over the world, expressing different levels of resistance against both pathogens, was screened. Seedling resistance was tested under controlled greenhouse conditions with three isolates of each pathogen. Adult plant resistance was tested in field trials at three and two locations for Ptt and Bs, respectively. Phenotypic results showed a wide range of the level of resistance and significant differences between accessions were observed in all trials. The set was genotyped using the Illumina iSelect 50k barley SNP chip. After filtering for quality control parameters, i.e. failure rates < 10%, heterozygous calls < 12.5% and minor allele frequency > 5%, 33,318 polymorphic, mapped SNPs were left for further genome-wide association studies