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Enter keyword(s) and/or category/ies. Selecting categories for a query makes a search more specific. For example, you can retrieve sentences that contain the word HSN and a
Oryza sativa
gene name by typing the keyword 'SPW1' and choosing the category 'gene (Oryza sativa)'. A category hit occurs when a particular word or phrase in the sentence is defined as a member of a particular category. Categories will be concatenated by a Boolean 'and' operation to other categories and keyword(s) if present. To search for terms in categories, click on the Categories/Ontology link above.
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Score:
2.00
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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