Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX

Late blight of potato (Solanum tuberosum), caused by Phytophthora infestans, can effectively be managed by genetic resistance. The MaR9 differential plant provides durable resistance to a broad spectrum of late blight strains. This resistance is brought about by at least seven genes derived from S. demissum including R1, Rpiabpt1, R3a, R3b, R4, R8 and, so far uncharacterized resistance gene(s). Here we set out to genetically characterize this additional resistance in MaR9. Three BC1 populations derived from MaR9 were identified that segregated for IPO-C resistance but that lacked R8. One BC1 population IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized. showed a continuous scale of resistance phenotypes, suggesting that multiple quantitative resistance genes were segregating. In two other BC1 populations esistance and susceptibility were segregating in a 1:1 ratio, suggesting a single qualitative resistance gene (R9a). A chromosome IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized.

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Main Authors: Jo, K.R., Visser, R.G.F., Jacobsen, E., Vossen, J.H.
Format: Article/Letter to editor biblioteca
Language:English
Subjects:allele conferring resistance, broad-spectrum resistance, disease resistance, famine fungus, field-resistance, hypersensitive resistance, phytophthora-infestans, r-gene, race-specific resistance, solanum-tuberosum,
Online Access:https://research.wur.nl/en/publications/characterisation-of-the-late-blight-resistance-in-potato-differen
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spelling dig-wur-nl-wurpubs-4881622024-12-04 Jo, K.R. Visser, R.G.F. Jacobsen, E. Vossen, J.H. Article/Letter to editor Theoretical and Applied Genetics 128 (2015) 5 ISSN: 0040-5752 Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX 2015 Late blight of potato (Solanum tuberosum), caused by Phytophthora infestans, can effectively be managed by genetic resistance. The MaR9 differential plant provides durable resistance to a broad spectrum of late blight strains. This resistance is brought about by at least seven genes derived from S. demissum including R1, Rpiabpt1, R3a, R3b, R4, R8 and, so far uncharacterized resistance gene(s). Here we set out to genetically characterize this additional resistance in MaR9. Three BC1 populations derived from MaR9 were identified that segregated for IPO-C resistance but that lacked R8. One BC1 population IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized. showed a continuous scale of resistance phenotypes, suggesting that multiple quantitative resistance genes were segregating. In two other BC1 populations esistance and susceptibility were segregating in a 1:1 ratio, suggesting a single qualitative resistance gene (R9a). A chromosome IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized. en application/pdf https://research.wur.nl/en/publications/characterisation-of-the-late-blight-resistance-in-potato-differen 10.1007/s00122-015-2480-6 https://edepot.wur.nl/342682 allele conferring resistance broad-spectrum resistance disease resistance famine fungus field-resistance hypersensitive resistance phytophthora-infestans r-gene race-specific resistance solanum-tuberosum https://creativecommons.org/licenses/by/4.0/ Wageningen University & Research
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language English
topic allele conferring resistance
broad-spectrum resistance
disease resistance
famine fungus
field-resistance
hypersensitive resistance
phytophthora-infestans
r-gene
race-specific resistance
solanum-tuberosum
allele conferring resistance
broad-spectrum resistance
disease resistance
famine fungus
field-resistance
hypersensitive resistance
phytophthora-infestans
r-gene
race-specific resistance
solanum-tuberosum
spellingShingle allele conferring resistance
broad-spectrum resistance
disease resistance
famine fungus
field-resistance
hypersensitive resistance
phytophthora-infestans
r-gene
race-specific resistance
solanum-tuberosum
allele conferring resistance
broad-spectrum resistance
disease resistance
famine fungus
field-resistance
hypersensitive resistance
phytophthora-infestans
r-gene
race-specific resistance
solanum-tuberosum
Jo, K.R.
Visser, R.G.F.
Jacobsen, E.
Vossen, J.H.
Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
description Late blight of potato (Solanum tuberosum), caused by Phytophthora infestans, can effectively be managed by genetic resistance. The MaR9 differential plant provides durable resistance to a broad spectrum of late blight strains. This resistance is brought about by at least seven genes derived from S. demissum including R1, Rpiabpt1, R3a, R3b, R4, R8 and, so far uncharacterized resistance gene(s). Here we set out to genetically characterize this additional resistance in MaR9. Three BC1 populations derived from MaR9 were identified that segregated for IPO-C resistance but that lacked R8. One BC1 population IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized. showed a continuous scale of resistance phenotypes, suggesting that multiple quantitative resistance genes were segregating. In two other BC1 populations esistance and susceptibility were segregating in a 1:1 ratio, suggesting a single qualitative resistance gene (R9a). A chromosome IX PCR marker, 184-81, fully co-segregated with R9a. The map position of R9a on the distal end of the lower arm of chromosome IX was confirmed using PCR markers GP101 and Stm1021. Successively, cluster-directed profiling (CDP) was carried out, revealing six closely linked markers. CDPSw58, CDPSw59 and CDPSw510 flanked the R9a gene at the distal end (5.8 cM) and, as expected, were highly homologous to Sw-5. CDPTm22 flanked R9a on the proximal side (2.9 cM). CDPTm26 and CDPTm27 fully cosegregated with resistance and had high homology to Tm-22, showing that R9a resides in a cluster of NBS–LRR genes with homology to Tm-22. Besides R9a, additional resistance of quantitative nature is found in MaR9, which remains to be genetically characterized.
format Article/Letter to editor
topic_facet allele conferring resistance
broad-spectrum resistance
disease resistance
famine fungus
field-resistance
hypersensitive resistance
phytophthora-infestans
r-gene
race-specific resistance
solanum-tuberosum
author Jo, K.R.
Visser, R.G.F.
Jacobsen, E.
Vossen, J.H.
author_facet Jo, K.R.
Visser, R.G.F.
Jacobsen, E.
Vossen, J.H.
author_sort Jo, K.R.
title Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
title_short Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
title_full Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
title_fullStr Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
title_full_unstemmed Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-22 homologs on chromosome IX
title_sort characterisation of the late blight resistance in potato differential mar9 reveals a qualitative resistance gene, r9a, residing in a cluster of tm-22 homologs on chromosome ix
url https://research.wur.nl/en/publications/characterisation-of-the-late-blight-resistance-in-potato-differen
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