Understanding Ramularia collo-cygni in the past, present and future. James Fountaine
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1 Understanding Ramularia collo-cygni in the past, present and future James Fountaine
2 Taxonomy Ramularia collo-cygni Collum = neck Cygnus = swan Phyllum: Hyphomycetes Order: Dothideales Family: Mycosphaerellaceae Section: Mycosphaerella
3 The spread of Ramularia Leaf Spot (RLS) Other known locations include: New Zealand, Australia, North and South America
4 GS0 Ramularia seed-borne Seed treatments? Asteromella? GS Ramularia detectable by diagnostics but no visual symptoms Airborne spores GS25-30 Ramularia spots on dying leaves GS25-30 Fungicides can reduce later disease epidemic Correlation between Leaf wetness and symptom development In June for spring barley & early April for w barley GS75-83 Ramularia symptoms on heads and awns GS65 Fungus detected inside leaves 2-4 weeks before symptoms GS45-49 Protect crops with fungicide
5 No dramatic cultivar resistance Varietal Resistance S Barley 2011 % leaf area infected Variety 5
6 Epidemiology of R. collo-cygni Spore release and RLS - Bush nd July 08 4th July 08 6th July 08 8th July 08 10th July 08 12th July 08 14th July 08 16th July 08 18th July 08 20th July 08 22nd July 08 24th July 08 26th July 08 28th July 08 30th July 08 1st Aug 08 3rd Aug 08 5th Aug 08 7th Aug 08 9th Aug 08 11th Aug 08 13th Aug 08 15th Aug 08 17th Aug 08 19th Aug 08 21st Aug 08 23rd Aug 08 25th Aug 08 27th Aug 08 29th Aug 08 31st Aug 08 2nd Sep 08 4th Sep 08 6th Sep 08 8th Sep 08 10th Sep 08 12th Sep 08 14th Sep 08 16th Sep 08 18th Sep 08 20th Sep 08 22nd Sep 08 24th Sep 08 26th Sep 08 28th Sep 08 30th Sep 08 Ramularia DNA (pgrams) Percentage RLS Date Ramularia conc. per day from spore tape w barley s barley
7 Control measures Chemical fungicides are the only option available at present In the UK, a mixture of Prothioconazole + SDHI + Chlorothalonil at GS45-49 is recommended Many of these chemicals are under threat from new EU legislation SDHI fungicides, give excellent control - Significant resistance issues Development of QoI and MBC resistance MBC have not been used for RLS control
8 Ramularia protection three year mean Epoxyconazole Izopyrazam + Cyprodinil Bixafen + Prothioconazole Xemium + Epoxyconazole Prothioconazole HGCAB2 Boscalid + Epoxyconazole Chlorothalonil 8
9 Historical archive samples Ramularia DNA on leaves and stems from the Hoosfield archive QoI resistance 50 Pg of DNA Detection of R. collo-cygni in archive material
10 Bioassay results MBC s PPM Carbendazim PPM Zoxamide Negative cross resistance is observed when a mutation is found at codon 198
11 Risk of fungicide resistance Relatively high risk DMI fungicides showing decline in efficacy Older fungicides QoI and MBC showing high level of resistance in most populations SDHI resistance a real risk! SAC and Syngenta have a joint project 11
12 Fungicide efficacy tests Bl Bl Bl Bl 12
13 Sequence of Sdh gene Sdh gene- subunites A, B, C & D Sdh B Replacement of Histidine? High level of fungicide resistance in related pathogens Courtesy of Marta Piotrowska
14 Sequencing of genome Illumina/solexa base sequencing Standard paired end library: 80x (4 Gb) 3 kb and 6 kb mate-pair library (10x) RNA seq library (80x) 454 Titanium sequencing cdna library to yield 180,000 reads Genome library to yield 360,000 reads 14
15 Why sequence and initial data Comparative genetics with other related pathogens, to develop understanding of the plantpathogen interactions CLC assembly of illumina and 454 data gives a genome size of 30 Mb in 355 supercontigs Close match to both Mycosphaerella graminicola and other Mycospharella spp. 15
16 Population genetics (SSR s) SSR nr. SSR type Alleles per locus 1 p5 4 2 p5 2 3 p5 4 4 p5 5 5 p5 2 6 p5 4 7 p5 4 8 p5 4 9 p p p Shared genetic identity CH 2009 NZ 2011 DK 2005 GBS 2009 AT 2001 GBE 2009 CZ FR 2009 GBS 2008 CZ Isolates
17 R. collo-cygni biology Using GFP isolate to understand development during the whole growing season Photos courtesy of Maciej Kaczmarek
18 R. collo-cygni biology Photos courtesy of Maciej Kaczmarek 18
19 R. collo-cygni biology Location of R.cc in seed Thick layer of hyphae present under the seed coat, outside the aleurone layer of the endosperm 19 Photos courtesy of Maciej Kaczmarek
20 Acknowledgments Dr. Fiona Burnett, Dr. Neil Havis, Mrs Jeanette Taylor and Mrs Linda Paterson at SAC for all the help and support Dr. Bart Fraaije, Rothamsted Research And both Marta Piotrowska & Maciej Kaczmarek for being enthusiastic Ph.D. students
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