Mapping of a novel locus Ra conferring extreme resistance against potato virus A in cultivated potato (Solanum tuberosum L.)
Key message The Ra extreme resistance against potato virus A was mapped to the upper of chromosome 4 in tetraploid potato. Potato virus A (PVA) is one of the major viruses affecting potato worldwide and can cause serious disease symptoms and yield losses. Previously, we determined that potato cultiv...
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Published in | Theoretical and applied genetics Vol. 137; no. 8; p. 198 |
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Main Authors | , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.08.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Key message
The Ra extreme resistance against potato virus A was mapped to the upper of chromosome 4 in tetraploid potato.
Potato virus A (PVA) is one of the major viruses affecting potato worldwide and can cause serious disease symptoms and yield losses. Previously, we determined that potato cultivar Barbara harbors
Ry
sto
(genotype:
Ryryryry
) and
Ra
(genotype:
Rararara
) that each independently confer extreme resistance to PVA. In this study, employing a combination of next-generation sequencing and bulked-segregant analysis, we further located this novel
Ra
on chromosome 4 using a tetraploid BC
1
potato population derived from a
Ry
-free progeny (
Rararararyryryry
) of Barbara (
RarararaRyryryry
) × F58050 (
rararararyryryry
). Using 29 insertion–deletion (InDel) markers spanning chromosome 4,
Ra
was delimited by the InDel markers M8-83 and M10-8 within a genetic interval of 1.46 cM, corresponding to a 1.86-Mb genomic region in the potato DM reference genome. The InDel marker M10-8, which is closely linked with the resistance against PVA in the
Ry
-free segregating populations, was then used to screen 43 selected
Ry
sto
-free tetraploid potato breeding clones. The phenotype to PVA was significantly correlated with the present/absent of the marker, albeit with a 9.3% false positive rate and a 14.0% false negative rate. These findings are of importance in furthering the cloning of
Ra
and employing the marker-assisted selection for PVA resistance. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0040-5752 1432-2242 1432-2242 |
DOI: | 10.1007/s00122-024-04705-x |