Paclobutrazol and acibenzolar-S-methyl induced tomato seedling growth response and resistance to bacterial speck (Pseudomonas syringae pv. tomato)

dc.contributor.advisorSouza-Machado, V.
dc.contributor.advisorPitblado, R.E.
dc.contributor.authorMahesaniya, Akbarali
dc.date.accessioned2020-08-24T15:30:12Z
dc.date.available2020-08-24T15:30:12Z
dc.date.copyright2002
dc.degree.departmentDepartment of Horticultural Scienceen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractPaclobutrazol, a plant growth regulator and/or acibenzolar-S-methyl, a plant defense activator were postemergence sprayed on two-week-old tomato plug seedlings to evaluate growth response and bacterial speck disease severity. Paclobutrazol induced significant changes involving reduced shoot height, leaf area, fresh shoot and root weights and increased stem diameter and leaf greenness. Acibenzolar-S-methyl had no marked effect on seedling growth except senescence of the lower leaves at higher concentrations. When these two chemicals were combined, the seedlings showed similar growth effects as seen with paclobutrazol but the senescence caused by acibenzolar-S-methyl was reduced. Two repeat applications of acibenzolar-S-methyl as compared to a single application had no significant effects on seedling growth. Bacterial speck foliar symptoms and speck lesion growth were reduced by acibenzolar-S-methyl and the combination of paclobutrazol and acibenzolar-S-methyl showed improved disease control. Higher doses of acibenzolar-S-methyl at either one application or two split applications did not improve disease control over one application. Acibenzolar-S-methyl at 30 mg L-1 with paclobutrazol 5 mg L-1 was the better combination in terms of seedling development and bacterial speck control. The response of different cultivars to paclobutrazol and acibenzolar-S-methyl were similar for growth effects and bacterial speck disease control.en_US
dc.identifier.urihttps://hdl.handle.net/10214/19407
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectTomato seedlingen_US
dc.subjectGrowthen_US
dc.subjectPaclobutrazolen_US
dc.subjectAcibenzolar-S-methylen_US
dc.subjectBacterial specken_US
dc.titlePaclobutrazol and acibenzolar-S-methyl induced tomato seedling growth response and resistance to bacterial speck (Pseudomonas syringae pv. tomato)en_US
dc.typeThesisen_US

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