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Plant Physiol, May 2000, Vol. 123, pp. 243-254
Comparative Analysis of Expressed Sequences in Phytophthora
sojae1
Dinah
Qutob,
Peter T.
Hraber,
Bruno W.S.
Sobral, and
Mark
Gijzen*
Agriculture and Agri-Food Canada, 1391 Sandford Street, London,
Ontario, Canada N5V 4T3 (D.Q., M.G.); Department of Microbiology and
Immunology, University of Western Ontario, London, Ontario, Canada N6A
5C1 (D.Q.); and National Center for Genome Resources, 1800 Old Pecos
Trail, Santa Fe, New Mexico 87505 (P.T.H., B.W.S.S.)
Phytophthora sojae (Kaufmann and Gerdemann) is an
oomycete that causes stem and root rot on soybean (Glycine
max L. Merr) plants. We have constructed three cDNA libraries
using mRNA isolated from axenically grown mycelium and zoospores and
from tissue isolated from plant hypocotyls 48 h after inoculation
with zoospores. A total of 3,035 expressed sequence tags (ESTs) were
generated from the three cDNA libraries, representing an estimated
2,189 cDNA transcripts. The ESTs were classified according to putative
function based on similarity to known proteins, and were analyzed for
redundancy within and among the three source libraries. Distinct
expression patterns were observed for each library. By analysis of the
percentage G+C content of the ESTs, we estimate that two-thirds of the
ESTs from the infected plant library are derived from P.
sojae cDNA transcripts. The ESTs originating from this study
were also compared with a collection of Phytophthora
infestans ESTs and with all other non-human ESTs to assess the
similarity of the P. sojae sequences to existing EST
data. This collection of cDNA libraries, ESTs, and accompanying
annotation will provide a new resource for studies on oomycetes and on
soybean responses to pathogen challenge.
1
This work was supported in part by a grant from
the Ontario Soybean Growers.
*
Corresponding author; e-mail gijzenm{at}em.agr.ca; fax
519-457-3997.
© 2000 American Society of Plant Physiologists
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