Journal Article10.1007/BF00223378
Advanced backcross QTL analysis in a cross between an elite processing line of tomato and its wild relative L. pimpinellifolium.
Steven D. Tanksley,Silvana Grandillo,T. M. Fulton,Dani Zamir,Yuval Eshed,Vincent Petiard,J. Lopez,T. Beck-Bunn +7 more
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TL;DR: QTL-NIL lines, containing specific QTLs modifying fruit size and shape, were subsequently constructed and shown to display the transgressive phenotypes predicted from the original BC2 QTL analysis.
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Abstract: Approximately 170 BC2 plants from a cross between an elite processing inbred (recurrent parent) and the wild species Lycopersicon pimpinellifolium LA1589 (donor parent) were analyzed with segregating molecular markers covering the entire tomato genome. Marker data were used to identify QTLs controlling a battery of horticultural traits measured on BC2F1 and BC3 families derived from the BC2 individuals. Despite its overall inferior appearance, L. pimpinellifolium was shown to possess QTL alleles capable of enhancing most traits important in processing tomato production. QTL-NIL lines, containing specific QTLs modifying fruit size and shape, were subsequently constructed and shown to display the transgressive phenotypes predicted from the original BC2 QTL analysis. The potential of exploiting unadapted and wild germplasm via advanced backcross QTL analysis for the enhancement of elite crop varieties is discussed.
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Citations
Exploring novel QTLs among backcross lines for salinity tolerance in rice
Sarita Kumari,Balwant Singh,S. Paul Singh,Dhriti Satya,Sangeeta Singh,K. Tripathy,Kishor Gaikwad,Vandna Rai,Nagendra K. Singh +8 more
TL;DR: Sharma et al. as mentioned in this paper used controlled phenotyping and QTL flanking DNA markers to identify four lines, namely SN 32, SN 33, SN 39 and SN 45, which were found highly tolerant to salinity at both seedling and reproductive stages and were backcrossed to IR 64 to generate BC2F1 seeds for development of advance introgressed lines.
QTL influencing kernel chemical composition and seedling stand establishment in sweet corn with the shrunken2 and sugary enhancer1 endosperm mutations
John A. Juvik,Gad G. Yousef,Tae-Ho Han,Y. Tadmor,Fermin Azanza,William F. Tracy,Avri Bar-Zur,Torbert Rocheford +7 more
TL;DR: Segregating QTL linked to RFLP loci in these populations that exert significant effects on the studied traits are candidates for molecular marker-assisted selection to improve sweet corn seed quality.
QTL analysis for eating quality-related traits in an F2:3 population derived from waxy corn × sweet corn cross
TL;DR: The new QTLs identified by the present study could serve as useful molecular markers for selecting important eating quality traits in subsequent waxy corn breeding studies.
Regional differences in the abiotic environment contribute to genomic divergence within a wild tomato species
TL;DR: An important role for selection imposed by the abiotic environment in driving genomic differentiation between populations is indicated, by studying how SNP–environment associations vary throughout the genome.
Zooming In on a Quantitative Trait for Tomato Yield Using Interspecific Introgressions
TL;DR: QTL analysis representing five different tomato species delimited the functional polymorphism of Brix9-2-5 to an amino acid near the catalytic site of the invertase crystal, affecting enzyme kinetics and fruit sink strength, underline the power of diverse ILs for high-resolution perspectives on complex phenotypes.
References
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Advanced backcross QTL analysis: a method for the simultaneous discovery and transfer of valuable QTLs from unadapted germplasm into elite breeding lines.
Steve Tanksley,James C. Nelson +1 more
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Andrew H. Paterson,S Damon,J D Hewitt,Dani Zamir,Haim D. Rabinowitch,Stephen E Lincoln,Eric S. Lander,Steve Tanksley +7 more
TL;DR: The results suggested that, for a trait with low heritability (soluble solids), the phenotype of F3 progeny could be predicted more accurately from the genotype of the F2 parent at QTLs than from the phenotypic variation of theF2 individual.
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