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Title: Stage-specific gene expression during urediniospore germination in Puccinia striiformis f . sp tritici .
Author: Zhang Y Qu Z Zheng W Liu B Wang X Xue X Xu L Huang L Han Q Zhao J Kang Z
Journal: BMC Genomics Citation: V : 9 P : 203 Year: 2008 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub18447959 Accession (PMID): 18447959
Abstract: BACKGROUND : Puccinia striiformis f . sp . tritici is an obligate biotrophic pathogen that causes leaf stripe rust on wheat . Although it is critical to understand molecular mechanisms of pathogenesis in the wheat stripe rust fungus for developing novel disease management strategies , little is known about its genome and gene functions due to difficulties in molecular studies with this important pathogen . To identify genes expressed during early infection stages , in this study we constructed a cDNA library with RNA isolated from urediniospores of P striiformis f . sp . tritici germinated for 10 h . RESULTS : A total of 4798 ESTs were sequenced from the germinated urediniospore library and assembled into 315 contigs and 803 singletons . About 23 . 9% and 13 . 3% of the resulting 1118 unisequences were homologous to functionally characterized proteins and hypothetical proteins , respectively . The rest 62 . 8% unisequences had no significant homologs in GenBank . Several of these ESTs shared significant homology with known fungal pathogenicity or virulence factors , such as HESP767 of the flax rust and PMK1 , GAS1 , and GAS2 of the rice blast fungus . We selected six ESTs ( Ps28 , Ps85 , Ps87 , Ps259 , Ps261 , and Ps159 ) for assaying their expression patterns during urediniospore germination and wheat infection by quantitative real-time PCR . All of them had the highest transcript level in germinated urediniospores and a much less transcript level in un-germinated urediniospores and infected wheat it issues ( 1-7 dpi ) . The transcript level of Ps159 increased at later infection stages ( 6-7 dpi ) . Our data indicated that these genes were highly expressed in germinated urediniospores and may play important roles in fungal-plant interactions during early infection stages in the wheat stripe rust fungus . CONCLUSION : Genes expressed in germinated urediniospores of P striiformis f . sp . tritici were identified by EST analysis . Six of them were confirmed by quantitative real-time PCR assays to be highly expressed in germinated urediniospores .
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[ Sen. 8, subscore: 1.00 ]: We selected six ESTs ( Ps28 , Ps85 , Ps87 , Ps259 , Ps261 , and Ps159 ) for assaying their expression patterns during urediniospore germination and wheat infection by quantitative real-time PCR .
[ Sen. 10, subscore: 1.00 ]: The transcript level of Ps159 increased at later infection stages ( 6-7 dpi ) .
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