Abstract
Key message
Bulk segregant analysis coupled with whole genome sequencing is a powerful approach and cost-effective method to identify loci controlling fruit traits in tomato.
Abstract
Domestication of fruit and vegetable crops was accompanied by selection for weight of the edible parts. Increases in fruit weight are controlled by multiple quantitative trait loci (QTL). To date, only two fruit weight genes have been cloned and a third has been fine-mapped. Genes that control locule number also impact fruit weight and two of them are known. To efficiently identify additional tomato fruit weight (FW) and locule number (LC) loci, six F2 populations were generated from crosses between closely related tomato accessions for which the alleles of the cloned FW and LC genes were known. We employed the bulk segregant approach coupled to whole genome sequencing (QTL-seq) which led to the identification of three highly significant and newly mapped FW QTL. fw11.2 was located in the distal part of chromosome 11 above the known loci fas and fw11.3; fw1.1 in the pericentromeric region of chromosome 1; and fw3.3 located ~1.6 Mb below the known fruit weight gene, SlKLUH/FW3.2. In addition, we mapped three LC QTL (lcn2.4, lcn5.1, and lcn6.1) although their significance was generally low. To confirm the location of the gene underlying fw11.2, we developed additional markers and conducted progeny tests. These results allowed us to narrow down the fw11.2 QTL to a region of ~750 kb corresponding to 66 candidate genes. Our research approach provided a cost-effective and time-efficient method for the identification of additional genes involved in FW and LC that could be used for both fruit development studies and crop improvement programs.
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Acknowledgments
This work was supported by the Agriculture and Food Research Initiative competitive grant no. 2013-67013-21229 of the USDA National Institute of Food and Agriculture and by a National Science Foundation grant IOS 0922661 to EvdK.
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Illa-Berenguer, E., Van Houten, J., Huang, Z. et al. Rapid and reliable identification of tomato fruit weight and locule number loci by QTL-seq. Theor Appl Genet 128, 1329–1342 (2015). https://doi.org/10.1007/s00122-015-2509-x
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DOI: https://doi.org/10.1007/s00122-015-2509-x