Abstract
Solanum tuberosum (potato) is the fourth major crop worldwide and is used for food, feed and biotechnological applications. To fully realize the biosynthetic potential for the production of starch, protein and metabolites, we conducted an extensive quantitative profiling of the expressed genes of mature potato tuber. A total of 58,322 serial analysis of gene expression (SAGE) tags of 19 nucleotides (nt), representing 22,233 different tags, were analysed. The 695 tags seen 10 or more times were assigned a tentative function by comparison with homologous genes. The identities of 12 'known' and 12 'unknown' transcripts were confirmed by rapid amplification of cDNA ends (RACE) cloning using the 19 nt tag as a primer. The SAGE and expressed sequence tag (EST) profiles of potato tuber were compared. Transcripts for four types of protease inhibitor, a metallothionein and a lipoxygenase were more prominent than patatin isoforms.
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