title: Expressed sequence tag analysis of the soybean rust pathogen Phakopsora pachyrhizi.
abstract: Soybean rust is caused by the obligate fungal pathogen Phakopsora pachyrhizi Sydow. A unidirectional cDNA library was constructed using mRNA isolated from germinating P. pachyrhizi urediniospores to identify genes expressed at this physiological stage. Single pass sequence analysis of 908 clones revealed 488 unique expressed sequence tags (ESTs, unigenes) of which 107 appeared as multiple copies. BLASTX analysis identified 189 unigenes with significant similarities (Evalue<10(-5)) to sequences deposited in the NCBI non-redundant protein database. A search against the NCBI dbEST using the BLASTN algorithm revealed 32 ESTs with high or moderate similarities to plant and fungal sequences. Using the Expressed Gene Anatomy Classification, 31.7% of these ESTs were involved in primary metabolism, 14.3% in gene/protein expression, 7.4% in cell structure and growth, 6.9% in cell division, 4.8% in cell signaling/cell communication, and 4.8% in cell/organism defense. Approximately 29.6% of the identities were to hypothetical proteins and proteins with unknown function.
authors.affiliation: USDA-Agricultural Research Service, Foreign Disease-Weed Science Research Unit, 1301 Ditto Avenue, Fort Detrick, MD 21702, USA.
authors.forename: Martha Lucia
authors.initials: ML
authors.lastname: Posada-Buitrago
authors.forename: Reid D
authors.initials: RD
authors.lastname: Frederick
mesh_terms: D001487:Basidiomycota / Q000235:genetics*; D020224:Expressed Sequence Tags; D005656:Fungal Proteins / Q000235:genetics* / Q000502:physiology; D018628:Gene Dosage; D015723:Gene Library; D008969:Molecular Sequence Data; D012331:RNA, Fungal / Q000235:genetics / Q000302:isolation & purification; D012333:RNA, Messenger / Q000235:genetics / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D017385:Sequence Homology; D013172:Spores, Fungal / Q000235:genetics
chemical_list: D005656:Fungal Proteins; D012331:RNA, Fungal; D012333:RNA, Messenger