Characterisation of the late blight resistance in potato differential MaR9 reveals a qualitative resistance gene, R9a, residing in a cluster of Tm-2 (2) homologs on chromosome IX

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Kwang-Ryong JoJack Vossen

Abstract

The durable late blight resistance in potato plant Ma R9 is genetically characterized. A novel R -gene is mapped. The monogenic nature and map positions of R9 are negated and rectified. 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, Rpi-abpt1, 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 showed a continuous scale of resistance phenotypes, suggesting that multiple quantitative resistance genes were segregating. In two other BC1 populations resistance 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 GP10...Continue Reading

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Citations

Feb 1, 2018·Journal of Experimental Botany·Rui JiangConghua Xie
Sep 17, 2015·G3 : Genes - Genomes - Genetics·Alicia N MassaDavid S Douches
May 28, 2021·3 Biotech·Sanjeev SharmaVinay Bhardwaj

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Datasets Mentioned

BETA
JF317285.1

Methods Mentioned

BETA
dissection
PCRs
PCR
Genome Sequencing

Software Mentioned

TetraploidMap
DNASTAR SeqMan [UNK]

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