Narrative
Sw-5/CU17NBL is a line derived in the CU17NBL acylsugar benchmark breeding line by transferring an introgression containing the Sw-5 gene for resistance to TSWV.
The creation of the major Cornell acylsugar lines including CU071026 and CU17NBL is reviewed in the publication by Mutschler (2021).
CU17NBL has 5 S. pennellii introgressions which combined are ca. 11% of the CU17NBL genome. The locations and sizes of these locations using the 2.5 genome build are:
• Chromosome 2: the Chr2 introgression, from 53,792,960 - 55,238,304 bp: Therefore, it is 1,445,344 bp in length.
• Chromosome 3: the Chr3 introgression, from 2,143,744 - 64,451,474 bp: Therefore, it is 62,307,730 bp length.
• Chromosome 7: the Chr7 introgression, from 65,554,074 – 65,801,666 bp: Therefore, it is 247,592 bp in length.
• Chromosome 8: the Chr8 introgression, from 60,843,834 – 63,384,503 bp: Therefore, it is 2,540,669 bp in length
• Chromosome 10: the Chr10U introgression, from 0 - 1,916,909 bp: Therefore, it is 1,916,909 bp in length.
The additional introgression of QTL6/CU17NBL is the Chromosome 9 introgression with Sw-5 for resistance to TSWV, that is found in numerous modern tomato lines. This introgression is NOT from S. pennellii and is of unknown length.
The Sw-5/CU17NBL line was created as an additional line from the segregating population used to create the lines QTL6/CU17NBL and QTL6/Sw-5/CU17NBL. The immediate source of the Sw-5 containing introgression to create the Sw-5/CU17NBL lines was the line in CU071026, QTL6/Sw-5/CU071026.
A publication regarding creation and complete characterizations of Sw-5/CU17NBL, QTL6/CU17NBL and QTL6/Sw-5/CU17NBL, and other variant lines in CU17NBL is in preparation.