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Quantitative resistance to late blight from Solanum berthaultii cosegregates with R(Pi-ber): insights in stability through isolates and environment.

Quantitative resistance to late blight from Solanum berthaultii cosegregates with R(Pi-ber): insights in stability through isolates and environment.

Authors :
Rauscher G
Simko I
Mayton H
Bonierbale M
Smart CD
Grünwald NJ
Greenland A
Fry WE
Source :
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2010 Nov; Vol. 121 (8), pp. 1553-67. Date of Electronic Publication: 2010 Aug 06.
Publication Year :
2010

Abstract

Genetic resistance is a valuable tool in the fight against late blight of potatoes but little is known about the stability and specificity of quantitative resistance including the effect of defeated major resistance genes. In the present study we investigated the effect of different isolates of Phytophthora infestans on the mode of action of R(Pi-ber), an R-gene originating from Solanum berthaultii. The experiments were conducted on progenies derived from two reciprocal inter-specific backcrosses of Solanum tuberosum and S. berthaultii. The plant-pathogen interaction was tested in diverse environments including field, greenhouse and growth chamber conditions. The R(Pi-ber) gene provided complete resistance against a US8 isolate of P. infestans in all trials. When isolates compatible with R(Pi-ber) were used for inoculation, a smaller, but significant resistance effect was consistently detected in the same map position as the R-gene. This indicates that this R-gene provides a residual resistance effect, and/or that additional resistance loci are located in this genomic region of chromosome X. Additional quantitative resistance loci (QRL) were identified in the analyzed progenies. While some of the QRL (such as those near TG130 on chromosome III) were effective against several isolates of the pathogen, others were isolate specific. With a single exception, the S. berthaultii alleles were associated with a decrease in disease severity. Resistance loci reported in the present study co-locate with previously reported R-genes and QRL to P. infestans and other pathogens.

Details

Language :
English
ISSN :
1432-2242
Volume :
121
Issue :
8
Database :
MEDLINE
Journal :
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Publication Type :
Academic Journal
Accession number :
20689906
Full Text :
https://doi.org/10.1007/s00122-010-1410-x