How do plant species defend themselves against Oidium lycopersici? : mapping of monogenic and polygenic resistance in Lycopersicon species

C.C. Huang

Research output: Thesisinternal PhD, WU

Abstract

<p>The thesis describes: 1)Resistance mechanism of tomato and some other crop plant species against <em>O. lycopersici</em> , 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 <em>L. hirsutum</em> G1.1560 and G1.1290, <em>L. parviflorum</em> G1.1601 and <em>L. peruvianum</em> LA2172; and 4) Mapping of monogenic (in G1.1560 and G1.1290) and polygenic (in G1.1601) resistance.</p><p>It has been found that: 1) Resistance to <em>O. lycopersici</em> in <em>Lycopersicon</em> species is mainly associated with hypersensitive response. 2) Tobacco may be an alternative host of <em>O. lycopersici</em> . 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 <em>Ol-1</em> and <em>Ol-3</em> 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 <em>Ol-4</em> .</p>
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • Stam, P., Promotor, External person
  • Lindhout, W.H., Promotor, External person
Award date25 Apr 2001
Place of PublicationS.l.
Print ISBNs9789058083852
Publication statusPublished - 2001

Keywords

  • solanum
  • defence mechanisms
  • plant pathogenic fungi
  • oidium
  • disease resistance
  • genetic mapping

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