Abstract
The thesis describes: 1)Resistance mechanism of tomato and some other crop plant species against O. lycopersici , a causal agent of the recent outbreaks of tomato powdery mildew; 2) Host range and genetic variation of the pathogen; 3) Inheritance analysis of resistance in wild tomato accessions including L. hirsutum G1.1560 and G1.1290, L. parviflorum G1.1601 and L. peruvianum LA2172; and 4) Mapping of monogenic (in G1.1560 and G1.1290) and polygenic (in G1.1601) resistance.
It has been found that: 1) Resistance to O. lycopersici in Lycopersicon species is mainly associated with hypersensitive response. 2) Tobacco may be an alternative host of O. lycopersici . 3) Tomato powdery mildew isolates from different continents are very similar to each other, suggesting a single origin of these (field) isolates. 4) Resistances in G1.1560 and G1.1290 are monogenic and dominant. The two resistance genes Ol-1 and Ol-3 are both mapped between markers SCAF10 and H9A11, and are genetically not distinguishable from each other. 5) Resistance in G1.1601 is polygenic. Three QTLs for the resistance have been identified. 6) Resistance in LA2172 is monogenic and dominant. The corresponding resistance gene is designated Ol-4 .
| Original language | English |
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| Qualification | Doctor of Philosophy |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 25 Apr 2001 |
| Place of Publication | S.l. |
| Print ISBNs | 9789058083852 |
| Publication status | Published - 2001 |
Keywords
- solanum
- defence mechanisms
- plant pathogenic fungi
- oidium
- disease resistance
- genetic mapping