Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636446
Title: Effect of salinity and its interactions with Verticillium albo-serum of the disease development of tomato (Lycopersicon esculentum Mill) and lucerne (Medicago sativa C & M media) plants
Author: Dikilitas, M.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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Abstract:
In this project, plant-pathogen-, plant-salt-, pathogen-salt-, plant-pathogen-salt interactions were studied. The interactions between tomato and lucerne and isolates of the vascular wilt fungus Verticillium albo-atrum were investigated under non-saline and saline conditions. Pathogenicity trials indicated that isolates of V1 and V2 were pathogenic to tomato, however, the degree of pathogenicity of the isolates were affected by the particular cultivar, plant age, method of inoculation and temperature. The pathogenic effects of Verticillium on tomato did not increase with increasing spore concentration or when isolates were co-inoculated. NaC1 both delayed and reduced the germination rate of seeds and caused severe symptoms on plants. The effect of NaC1 was also detrimental on the germination and the growth rate of the fungus. Progress of the disease was markedly accelerated by salt stress. Various growth parameters were lower in the group of plants both inoculated with V. albo-atrum & treated with NaC1 than they were for plants inoculated only with V. albo-atrum or only treated with NaC1. As a defence response, an increase in PAL activity occurred when lucerne cells were treated with an elicitor from V. albo-atrum; a further increase was evident when cells were exposed to both elicitor and NaC1. However, the increase in PAL activity was minimised both at high concentrations of elicitor and NaC1. Disease-resistant and salt-tolerant plants showed resistance to V1 under non-saline and saline conditions; however, disease-susceptible and salt-tolerant plants did not show resistance to V1 under those conditions. Development of salt tolerant crops should therefore, involve selection of strains that maintain or improve its resistance to pathogens.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.636446  DOI: Not available
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