Genetics, Vol. 157, 949-956, March 2001, Copyright © 2001

Mapping of Avirulence Genes in Phytophthora infestans With Amplified Fragment Length Polymorphism Markers Selected by Bulked Segregant Analysis

Theo van der Leea, Andrea Robolda, Antonino Testaa, John W. van `t Kloostera, and Francine Goversa
a Laboratory of Phytopathology, Wageningen University and Graduate School of Experimental Plant Sciences, Binnenhaven 9, 6709 PD Wageningen, The Netherlands

Corresponding author: Francine Govers, Laboratory of Phytopathology, Wageningen University, Binnenhaven 9, 6709 PD Wageningen, The Netherlands., francine.govers{at}fyto.dpw.wag-ur.nl (E-mail)

Communicating editor: J. ARNOLD

In this study we investigated the genetic control of avirulence in the diploid oomycete pathogen Phytophthora infestans, the causal agent of late blight on potato. The dominant avirulence (Avr) genes matched six race-specific resistance genes introgressed in potato from a wild Solanum species. AFLP markers linked to Avr genes were selected by bulked segregant analysis and used to construct two high-density linkage maps, one containing Avr4 (located on linkage group A2-a) and the other containing a cluster of three tightly linked genes, Avr3, Avr10, and Avr11 (located on linkage group VIII). Bulked segregant analysis also resulted in a marker linked to Avr1 and this allowed positioning of Avr1 on linkage group IV. No bulked segregant analysis was performed for Avr2, but linkage to a set of random markers placed Avr2 on linkage group VI. Of the six Avr genes, five were located on the most distal part of the linkage group, possibly close to the telomere. The high-density mapping was initiated to facilitate future positional cloning of P. infestans Avr genes.




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