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Isolation of Potato Genes That Are Induced During an Early Stage of the Hypersensitive Response to Phytophthora infestans

April 1999 , Volume 12 , Number  4
Pages  356 - 361

Paul R. J. Birch , Anna O. Avrova , James M. Duncan , Gary D. Lyon , and Rachel L. Toth

Department of Fungal and Bacterial Plant Pathology, Scottish Crop Research Institute, Invergowrie, Dundee, DD2 5DA, U.K.

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Accepted 15 December 1998.

Suppression subtractive hybridization (SSH) was used to generate a cDNA library enriched for sequences induced in a late-blight-resistant potato cultivar undergoing the hypersensitive response (HR). Of 100 partial cDNA sequences submitted to international DNA and protein data bases, 42 showed similarity to 35 genes, of which 31 were from plants. Of these, 13 were previously characterized as either defense-, stress-, or senescence-associated. One sequence matched (75 to 81%) all known serine palmitoyltransferases (SPTs) at the protein level. SPT catalyzes the first committed step in the synthesis of sphingolipids, important signaling molecules involved in cell differentiation and apoptosis. Putative products of other genes identified here may play a role in programmed cell death, including protein degradation, DNA degradation, metal ion chelation, and signal transduction. cDNA-amplified fragment length polymorphism was used to confirm differential expression of sequences isolated by SSH.

Additional keyword: EST.

© 1999 The American Phytopathological Society