LINKAGE MAPPING OF CANDIDATE GENES FOR INDUCED RESISTANCE AND GROWTH PROMOTION BY Trichoderma koningiopsis (Th003) IN TOMATO Solanum lycopersicum

Abstract

Induced systemic resistance (ISR) is a mechanism by which plants enhance defenses against any stress condition. ISR and growth promotion are enhanced when tomato (Solanum lycopersicum) is inoculated with several strains of Trichoderma ssp. This study aims to genetically map tomato candidate genes involved in ISR and growth promotion induced by the Colombian native isolate Trichoderma koningiopsis Th003. Forty-nine candidate genes previously identified on tomato plants treated with Th003 and T. hamatum T382 strains were evaluated for polymorphisms and 16 of them were integrated on the highly saturated genetic linkage map named “TOMATO EXPEN 2000”. The location of six unigenes was similar to the location of resistance gene analogs (RGAs), defense related ESTs and resistance QTLs previously reported, suggesting new possible candidates for these quantitative trait loci (QTL) regions. The candidate gene-markers may be used for future ISR or growth promotion assisted selection in tomato.

Keywords

• Trichoderma koningiopsis
• Solanum lycopersicum
• ISR
• plant growth promotion
• candidate genes
• genetic linkage map