Abstract
The efficiency of marker-assisted backcross for the introgression of a quantitative trait locus (QTL) from a donor line into a recipient line depends on the stability of QTL expression. QTLs for six quality traits in tomato (fruit weight, firmness, locule number, soluble solid content, sugar content and titratable acidity) were studied in order to investigate their individual effect and their stability over years, generations and genetic backgrounds. Five chromosome regions carrying fruit quality QTLs were transferred following a marker-assisted backcross scheme from a cherry tomato line into three modern lines with larger fruits. Three sets of genotypes corresponding to three generations were compared: (1) an RIL population, which contained 50% of each parental genome, (2) three BC3S1 populations which segregated simultaneously for the five regions of interest but were almost fully homozygous for the recipient genome on the eight chromosomes carrying no QTL and (3) three sets of QTL-NILs (BC3S3 lines) which differed from the recipient line only in one of the five regions. QTL detection was performed in each generation, in each genetic background and during 2 successive years for QTL-NILs. About half of the QTLs detected in QTL-NILs were detected in both years. Eight of the ten QTLs detected in RILs were recovered in the QTL-NILs with the genetic background used for the initial QTL mapping experiment, with the exception of two QTLs for fruit firmness. Several new QTLs were detected. In the two other genetic backgrounds, the number of QTLs in common with the RILs was lower, but several new QTLs were also detected in advanced generations.
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Abbreviations
- Bgb:
-
Vil B genetic background
- Dgb:
-
Vil D genetic background
- EUG:
-
Eugenol
- FW:
-
Fruit weight
- Lgb:
-
Levovil genetic background
- LONB:
-
Locule number
- MAS:
-
Marker-assisted selection
- MYP:
-
Orthometoxyphenol
- SSC:
-
Soluble solids content
- SUC:
-
Sugar content
- TA:
-
Titratable acidity
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Acknowledgements
Many thanks to N. Baffert, A. Gautier and A. Luciani for genotypic and phenotypic works, to A.M. Cossalter for taking care of the plants and for her help during the phenotypic evaluations, to P. Duffé for plant genotyping, to R. Matthieu for chemical evaluations, to C. Dillmann for SAS programs and to Rebecca Stevens for English corrections. Laurent Lecomte was partly supported by the Conseil Régional Provence-Alpes-Côte d’Azur (France). The experiments comply with the current French laws.
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Chaïb, J., Lecomte, L., Buret, M. et al. Stability over genetic backgrounds, generations and years of quantitative trait locus (QTLs) for organoleptic quality in tomato. Theor Appl Genet 112, 934–944 (2006). https://doi.org/10.1007/s00122-005-0197-7
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DOI: https://doi.org/10.1007/s00122-005-0197-7