Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/27605
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dc.contributor.authorAli, Hayderen
dc.contributor.authorBackhouse, Daviden
dc.contributor.authorPereg, Lilyen
dc.date.accessioned2019-10-04T00:57:33Z-
dc.date.available2019-10-04T00:57:33Z-
dc.date.created2017-12-
dc.date.issued2018-03-07-
dc.identifier.urihttps://hdl.handle.net/1959.11/27605-
dc.descriptionAccess to Thesis dataset provided at the following link: https://hdl.handle.net/1959.11/215346en
dc.description.abstractThis study was focused on the effect of environmental and host factors on the antagonism of Fusarium wilt of tomato, caused by Fusarium oxysporum f. sp. lycopersici (Fol), by non-pathogenic strains of F. oxysporum. Seven non-pathogenic strains of F. oxysporum were isolated and screened for antagonism of Fusarium wilt. Strains F1 and F4 were chosen for further experiments as they reduced disease severity more than other non-pathogens. The best method for applying non-pathogens and pathogens was to inoculate soil with conidial suspension. The non-pathogens reduced seed germination and growth of tomato plants in the absence of the pathogen. In a split root system, non-pathogens F1 and F4 induced resistance of tomato plant against Fusarium wilt although there was no direct contact between the pathogen and non-pathogens. Iron at high and standard concentration in the nutrient solution stimulated induced resistance. However, direct antagonism of Fol by F4 was greatest at low level of iron.<br> Tomato root exudates increased in the vitro antifungal activity of non-pathogens toward pathogens and also increased spore germination of both non-pathogens and pathogens. The components of root exudates including sugars and organic acids influenced the antagonism of non-pathogens against pathogen in vitro. However sugars and organic acids had little effect on disease suppression in pot trials.<br> In dual culture, using NaNO3 as source of N, the inhibition of Fol by F1 and F4 was decreased at high level of N, whereas at high level of NaNO3 as source of N the antibiotic production increased. Using NH4Cl as source of N at high and low level, the inhibition of Fol by F1 and F4 was increased and the antibiotic production of non-pathogens also increased. In pot trials, the disease severity was less at low N compared with high level of N.<br> In dual culture, at low level of K the antagonistic activity of s F1 and F4 against Fol was improved. However, at high level of K, the antibiotic production of non-pathogens increased. In glasshouse pot trials, non-pathogens improved plant health at low level of K, whereas the growth of non-pathogens was decreased at high level of K.<br> At high level of Ca, the inhibition of growth of Fol by F1 and F4 was decreased. Also at low level of Ca the inhibition of growth of Fol by antibiotic production of F4 was increased. However, the inhibition of growth of Fol by antibiotic production of F1 was increased at high level of K.<br> The inhibition of growth of Fol by F1 and F4 was decreased with high level of iron. The antibiotic production of F1 and F4 inhibited growth of Fol at low level of iron more than at high level. Biological control did not work well at high levels of iron.<br> Further work is needed on the effect of non-pathogens on the growth of plants. More tests should be done on the effect of root exudate on antagonism. Biocontrol agents should be found that can work well at low nutrient levels.en
dc.languageenen
dc.titleEffect of Environmental and Host Factors on Biological Control of Fusarium Wilt by Non-Pathogenic Fusarium oxysporum in Tomatoen
dc.typeThesis Doctoralen
dcterms.accessRightsUNE Greenen
dc.subject.keywordsPlant Pathologyen
dc.subject.keywordsCrop and Pasture Protection (Pests, Diseases and Weeds)en
dc.subject.keywordsMicrobial Ecologyen
local.contributor.firstnameHayderen
local.contributor.firstnameDaviden
local.contributor.firstnameLilyen
local.subject.for2008060504 Microbial Ecologyen
local.subject.for2008060704 Plant Pathologyen
local.subject.for2008070308 Crop and Pasture Protection (Pests, Diseases and Weeds)en
local.subject.seo2008820301 Cottonen
local.subject.seo2008820215 Vegetablesen
dc.date.conferred2018en
local.hos.emailers-sabl@une.edu.auen
local.thesis.passedPasseden
local.thesis.degreelevelDoctoralen
local.thesis.degreenameDoctor of Philosophy - PhDen
local.contributor.grantorUniversity of New Englanden
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Science and Technologyen
local.profile.emailhali3@myune.edu.auen
local.profile.emaildbackhou@une.edu.auen
local.profile.emaillperegge@une.edu.auen
local.output.categoryT2en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune_thesis-20171207-125739en
local.access.fulltextYesen
local.contributor.lastnameAlien
local.contributor.lastnameBackhouseen
local.contributor.lastnamePeregen
dc.identifier.staffune-id:dbackhouen
dc.identifier.staffune-id:lpereggeen
dc.identifier.studentune-id:hali3en
local.profile.orcid0000-0003-0663-6002en
local.profile.roleauthoren
local.profile.rolesupervisoren
local.profile.rolesupervisoren
local.identifier.unepublicationidune:_thesis-20171207-125739en
local.identifier.unepublicationidune:_thesis-20171207-125739en
local.RightsStatementCopyright 2017 - Hayder Alien
dc.identifier.academiclevelStudenten
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.thesis.bypublicationNoen
local.title.maintitleEffect of Environmental and Host Factors on Biological Control of Fusarium Wilt by Non-Pathogenic Fusarium oxysporum in Tomatoen
local.output.categorydescriptionT2 Thesis - Doctorate by Researchen
local.relation.urlhttps://hdl.handle.net/1959.11/215346en
local.school.graduationSchool of Environmental & Rural Scienceen
local.search.authorAli, Hayderen
local.search.supervisorBackhouse, Daviden
local.search.supervisorPereg, Lilyen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/a5c75c9c-5dbe-4503-a47c-e0c7328267d2en
local.uneassociationYesen
local.year.conferred2018en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/a5c75c9c-5dbe-4503-a47c-e0c7328267d2en
local.fileurl.openpublishedhttps://rune.une.edu.au/web/retrieve/a5c75c9c-5dbe-4503-a47c-e0c7328267d2en
Appears in Collections:School of Environmental and Rural Science
Thesis Doctoral
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