Differential Selection on Rhynchosporium secalis During Parasitic and Saprophytic Phases in the Barley Scald Disease Cycle

cg.contactbruce.mcdonald@agrl.ethz.chen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerAustralian National University - ANUen_US
cg.contributor.centerScottish Crop Research Institute - SCRIen_US
cg.contributor.centerSwiss Federal Institute of Technology Zurich, Department of Environmental Systems Science, Institute of Integrative Biology - ETH Zurich - D-USYS - IBZen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.countryVAen_US
cg.coverage.regionSouthern Europeen_US
cg.creator.idBaum, Michael: 0000-0002-8248-6088en_US
cg.identifier.doihttps://dx.doi.org/10.1094/PHYTO-96-1214en_US
cg.isijournalISI Journalen_US
cg.issn0031-949Xen_US
cg.issue11en_US
cg.journalPhytopathologyen_US
cg.subject.agrovocpopulation geneticsen_US
cg.subject.agrovocmicrosatellitesen_US
cg.volume96en_US
dc.contributorBaum, Michaelen_US
dc.contributorCeccarelli, Salvatoreen_US
dc.contributorGrando, Stefaniaen_US
dc.contributorLinde, Celesteen_US
dc.contributorYahyaoui, Amoren_US
dc.contributorZhan, Jiasuien_US
dc.contributorMcDonald, Bruceen_US
dc.creatorAbang, Mathewen_US
dc.date.accessioned2022-03-04T20:35:26Z
dc.date.available2022-03-04T20:35:26Z
dc.description.abstractCompetition among eight Rhynchosporium secalis isolates was assessed during parasitic and saprophytic phases of the disease cycle in field experiments conducted at two locations and over two growing seasons. The eight isolates were inoculated onto six barley populations exhibiting varying degrees of resistance. Microsatellite analysis of 2,866 isolates recovered from the field experiments showed significant, and sometimes opposite, changes in the frequencies of R. secalis genotypes during the growing season (parasitic phase) and between growing seasons (saprophytic phase). Isolates that showed the most complex virulence in greenhouse seedling assays had the lowest fitness in the field experiment. Significant differences in isolate fitness were found on different host populations and in different environments. Selection coefficients were large, indicating that evolution can occur rapidly in field populations. Although inoculated isolates had the lowest overall fitness on the moderately resistant landrace cv. Arabi Aswad, some isolates were more virulent and consistently increased in frequency on this landrace, suggesting a risk of directional selection and possible erosion of the resistance following its widespread deployment in monoculture. These results provide the first direct evidence that R. secalis pathogen genotypes differ in their saprophytic ability and parasitic fitness under field conditions.en_US
dc.identifierhttps://mel.cgiar.org/reporting/downloadmelspace/hash/2cd99418e6d5f67d5bbc1d8359709cc9/v/1f1504eb0fe923e3898b822c0b8829cfen_US
dc.identifier.citationMathew Abang, Michael Baum, Salvatore Ceccarelli, Stefania Grando, Celeste Linde, Amor Yahyaoui, Jiasui Zhan, Bruce McDonald. (16/2/2007). Differential Selection on Rhynchosporium secalis During Parasitic and Saprophytic Phases in the Barley Scald Disease Cycle. Phytopathology, 96 (11), pp. 1214-1222.en_US
dc.identifier.statusOpen accessen_US
dc.identifier.urihttps://hdl.handle.net/20.500.11766/67180
dc.languageenen_US
dc.publisherAmerican Phytopathological Societyen_US
dc.rightsCopyrighted; Non-commercial educational use onlyen_US
dc.sourcePhytopathology;96,(2007) Pagination 1214-1222en_US
dc.titleDifferential Selection on Rhynchosporium secalis During Parasitic and Saprophytic Phases in the Barley Scald Disease Cycleen_US
dc.typeJournal Articleen_US
dcterms.available2007-02-16en_US
dcterms.extent1214-1222en_US
mel.impact-factor4.025en_US

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