Postdoctoral positions in Phytophthora sojae molecular biology

Brett Tyler bmtyler at
Fri Jul 20 02:48:43 EST 2001

Three postdoctoral positions are available in the molecular analysis 
of the Phytophthora sojae-soybean interaction in the following areas.

Gene-for-gene recognition between P. sojae and soybean.

So-called avirulence genes in pathogens directly or indirectly encode 
molecules that are recognized by plant receptors encoded by major 
resistance genes (R genes). There are 13 major resistance (Rps) genes 
in soybean against P. sojae, and matching single dominant avirulence 
genes in P. sojae.  We have cloned a 60 kb region spanning the 
tightly linked Avr1b and Avr1k genes, and have identified two genes 
required for the Avr1b phenotype.  Avr1b-1 encodes a protein that is 
secreted by the pathogen specifically during early infection, and 
that spreads systemically through the plant.  Avr1b-2 is required for 
transcription of Avr1b-1. We are currently focusing on the function 
of the Avr1b protein during infection, i.e. is it a virulence factor? 
The position on this project will be for 2 years, beginning September 
1, 2001.

P. sojae genome project.

We recently have begun a project to develop a coordinated genetic and 
physical map of the P. sojae genome, in order to greatly facilitate 
the cloning of genes from the organism. BAC libraries of P. sojae 
have been constructed and and have been partially assembled into 
contigs.  Sequencing of one contig has begun.  We have received a $1m 
grant from USDA for Phytophthora genomics, in collaboration with 
colleagues in 7 other labs in the US, Canada, The Netherlands and 
Scotland.  The goal of this project is to sequence 55,000 ESTs from 
P.sojae and P.infestans, then to construct a high density synteny map 
of the two species using a novel high-throughput procedure for 
matching EST and BAC clones.  We also plan to develop high throughput 
methods for silencing or disrupting P. sojae genes in order to 
determine the function of the cloned sequences.  Both positions on 
this project will be for 3 years, one beginning September 1, 2001 and 
the second July 1, 2002.

After July 2002 both projects will be located at the Virginia 
Bioinformatics Institute at Virginia Tech University.

If you are interested in one of the postdoctoral positions, please 
email me your CV including publications, date of availability and 
the names and addresses (including email addresses) of three 

Brett Tyler

Brett Tyler
Department of Plant Pathology
University of California, Davis

Tel (530) 752 4771
Fax: (530) 752 5674
Email: bmtyler at


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