Exploration of wild relatives of tomato for enhanced stress tolerance

Junming Li

Research output: Thesisinternal PhD, WU

Abstract

Among the different abiotic and biotic stresses, Botrytis cinerea, Phytophthora infestans and high salt concentrations are world-wide the most destructive. Several wild relatives of tomato were identified as source for tolerance to these stresses. Three introgression line (IL) populations derived from S. habrochaites LA1777, S. pennellii LA716 and S. lycopersicoides LA2951 were employed to identify quantitative trait loci (QTL). For B. cinerea resistance twenty four QTLs were identified in S. habrochaites LA1777 and S. lycopersicoides LA2951. These QTLs resulted in reduced lesion size (LS) and disease incidence (DI) in leaves, stem or fruits. Five QTLs were found in S. habrochaites LA1777 for reduced LS in the interaction between tomato and P. infestans. For salt tolerance in the seedling stage ten QTLs were identified in S. pennellii LA716 and five in S. lycopersicoides LA2951. Some QTLs were semi-dominant with a non-additive or even epistatic effect. Many QTLs co-localized indicating that cross talk between coordinating pathways for abiotic and biotic stress might exist. The results provide the basis to combine QTLs with tolerance to abiotic and biotic stresses and for further narrowing down the size of the introgressions. The introgressions from these wild relatives which are involved in tolerance to multiple stresses are of interest for tomato breeders.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • Visser, Richard, Promotor
  • van Heusden, Sjaak, Co-promotor
Award date19 Feb 2010
Place of Publication[S.l.
Print ISBNs9789085856122
Publication statusPublished - 2010

Keywords

  • solanum lycopersicum
  • tomatoes
  • wild relatives
  • solanum
  • solanum pennellii
  • solanum lycopersicoides
  • introgression
  • quantitative trait loci
  • disease resistance
  • botrytis cinerea
  • phytophthora infestans
  • salt tolerance

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