<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Potato breeding clones were evaluated for resistance to late blight (agent Phytophthora infestans) using tuber inoculation tests and for presence of the resistance alleles of R1 and R3a genes in polymerase chain reaction tests. Among clones tested those expressing high, moderate and low resistance were identified. The data were analysed for the impact of R1 and R3a genes on tuber resistance to late blight in tested plant material. In previous evaluations performed on smaller amount of clones the tuber resistance levels significantly depended on presence/absence of the resistance allele of R3a gene and did not depend on presence of R1 gene allele. In the current study the statistical analyses did not prove the significant difference in resistance levels depending on presence of the resistance alleles, neither of R1 gene, nor of R3a gene. Tuber resistant clones bearing R3a gene resistance alleles still noticeably prevailed over the clones bearing the alleles of R1 gene as well as over the clones bearing the no resistance alleles of both genes. In several cases the resistance of clones with detected resistance allele of R1 gene was higher compared to those derived from the same crosses and showing amplification of the allele of R3a gene or those with no resistance alleles. Clones accumulating the resistance alleles of both (R1 and R3a) genes expressed high tuber resistance accompanied by necrotic reaction. </p></abstract>

Potato breeding clones were evaluated for resistance to late blight (agent Phytophthora infestans) using tuber inoculation tests and for presence of the resistance alleles of R1 and R3a genes in polymerase chain reaction tests. Among clones tested those expressing high, moderate and low resistance were identified. The data were analysed for the impact of R1 and R3a genes on tuber resistance to late blight in tested plant material. In previous evaluations performed on smaller amount of clones the tuber resistance levels significantly depended on presence/absence of the resistance allele of R3a gene and did not depend on presence of R1 gene allele. In the current study the statistical analyses did not prove the significant difference in resistance levels depending on presence of the resistance alleles, neither of R1 gene, nor of R3a gene. Tuber resistant clones bearing R3a gene resistance alleles still noticeably prevailed over the clones bearing the alleles of R1 gene as well as over the clones bearing the no resistance alleles of both genes. In several cases the resistance of clones with detected resistance allele of R1 gene was higher compared to those derived from the same crosses and showing amplification of the allele of R3a gene or those with no resistance alleles. Clones accumulating the resistance alleles of both (R1 and R3a) genes expressed high tuber resistance accompanied by necrotic reaction.

The impact of R1and R3a genes on tuber resistance to late blight of the potato breeding clones

Federal Research Center, N. I. Vavilov All-Russian Institute of Plant Genetic Resources, B. Morskaya, 42, 44, St. Petersburg, 190000, RUSSIA

Institute of Agricultural Resources and Economics, Zinātnes 2, Priekuļi, LV-4126, LATVIA

Faculty of Biology, University of Latvia, Jelgavas 1, Rīga, LV-1004, LATVIA

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Potato breeding clones were evaluated for resistance to late blight (agent Phytophthora infestans) using tuber inoculation tests and for presence of the...

The impact of R1and R3a genes on tuber resistance to late blight of the potato breeding clones

Publié en ligne: 15 juin 2016

Pages: 58 - 63

Reçu: 14 avr. 2015

DOI: https://doi.org/10.1515/prolas-2016-0010

Mots clés
potato tubers, Phytophthora infestans, resistance genes

© by Nadezhda Zoteyeva

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The impact of R1and R3a genes on tuber resistance to late blight of the potato breeding clones

Publié en ligne: 15 juin 2016

Pages: 58 - 63

Reçu: 14 avr. 2015

DOI: https://doi.org/10.1515/prolas-2016-0010

Mots cléspotato tubers, Phytophthora infestans, resistance genes

© by Nadezhda Zoteyeva

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Mots clés
potato tubers, Phytophthora infestans, resistance genes