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Regulating Tomato quality through Expression

Subject Area Plant Physiology
Term from 2015 to 2020
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 263748294
 
Final Report Year 2019

Final Report Abstract

Under the Regulatome project, a high-quality near chromosome scale genome sequence of Solanum lycopersicoides (a total of 1.27G and a scaffold N50 of 93.9 Mb) has been produced with the help of additional funding leveraged from the TRIAD Foundation. Annotation of the genome with the aid of PacBio IsoSeq and Illumina RNA-Seq data resulted in 37,938 protein-coding genes. The S. lycopersicoides introgression lines into S. lycoperiscum were grown in replicated field trials and ripe fruit transcriptome profiling (RNA-Seq) was performed on all fruiting lines to generate both a gene expression reference for the fruit and to facilitate fine mapping of all wild species introgression. A subset of the population was also greenhouse grown under normal watering and drought stress with fruit subject to similar transcriptome profiling. Fruit from both trials have been examined for levels of nutrient and quality metabolites in multiple laboratories participating in the project (carotenoids, volatiles, broader metabolite profiling). The screening of the primary metabolite composition has been carried out for the S. lycopersicoides introgression line population grown in field conditions in both Israel and the USA. These trials confirmed previously characterized QTL found in other populations but more importantly identified novel QTL for the quality compound ascorbate and metabolites such as galactinol and raffinose which may play an important role under limited irrigation regimes. Additional approaches led to the identification of eQTLs and candidate genes influencing the levels of flavonols, carotenoids, flavor volatiles and vitE in tomato fruits. A number of these genes are currently being functionally tested.

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