R6 and R7 alleles of potato conferring race-specific resistance to Phytophthora infestans (Mont.) de Bary identified genetic loci clustering with the R3 locus on chromosome XI

1996 ◽  
Vol 92 (7) ◽  
pp. 880-884 ◽  
Author(s):  
A. El-Kharbotly ◽  
C. Palomino-Sánchez ◽  
F. Salamini ◽  
E. Jacobsen ◽  
C. Gebhardt
Keyword(s):  
Phytophthora Infestans ◽  
Specific Resistance ◽  
Genetic Loci

Race specific resistance against Phytophthora infestans in potato is controlled by more genetic factors than only R-genes

Euphytica ◽  
1996 ◽  
Vol 90 (3) ◽  
pp. 331-336 ◽  
Author(s):  
Ali El-Kharbotly ◽  
Andy Pereira ◽  
Willem J. Stiekema ◽  
Evert Jacobsen
Keyword(s):  
Phytophthora Infestans ◽  
Genetic Factors ◽  
Specific Resistance ◽  
R Genes

scholarly journals Quantitative resistance to Phytophthora infestans in potato: a case study for QTL mapping in an allogamous plant species.

Genetics ◽  
1994 ◽  
Vol 137 (1) ◽  
pp. 67-77 ◽  
Author(s):  
C Leonards-Schippers ◽  
W Gieffers ◽  
R Schäfer-Pregl ◽  
E Ritter ◽  
S J Knapp ◽  
...  
Keyword(s):  
Qtl Mapping ◽  
Phytophthora Infestans ◽  
Specific Resistance ◽  
Quantitative Resistance ◽  
Potato Virus X ◽  
Interval Mapping ◽  
Wild Potato Species ◽  
Resistance Response ◽  
Multiple Alleles ◽  
Specific Proteins

Abstract Phytophthora infestans is the most important fungal pathogen in the cultivated potato (Solanum tuberosum). Dominant, race-specific resistance alleles and quantitative resistance--the latter being more important for potato breeding--are found in the germplasm of cultivated and wild potato species. Quantitative trait loci (QTLs) for resistance to two races of P. infestans have been mapped in an F1 progeny of a cross between non-inbred diploid potato parents with multiple alleles. Interval mapping methods based on highly informative restriction fragment length polymorphism markers revealed 11 chromosome segments on 9 potato chromosomes showing significant contrasts between marker genotypic classes. Whereas phenotypically no difference in quantitative resistance response was observed between the two fungal races, QTL mapping identified at least one race specific QT locus. Two QT regions coincided with two small segments on chromosomes V and XII to which the dominant alleles R1, conferring race specific resistance to P. infestans, Rx1 and Rx2, both inducing extreme resistance to potato virus X, have been allocated in independent mapping experiments. Some minor QTLs were correlated with genetic loci for specific proteins related to pathogenesis, the expression of which is induced after infection with P. infestans.

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