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12 matches found in 9 documents. Search time: 0.01 seconds.
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Score: 3.00
Title: Identification and fine mapping of Pi33 , the rice resistance gene corresponding to the Magnaporthe grisea avirulence gene ACE1 .
Author: Berruyer R Adreit H Milazzo J Gaillard S Berger A Dioh W Lebrun MH Tharreau D
Journal: Theor . Appl . Genet . Citation: V : 107 ( 6 ) P : 1139-47 Year: 2003 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub12838393
Abstract: Rice blast disease is a major constraint for rice breeding . Nevertheless , the genetic basis of resistance remains poorly understood for most rice varieties , and new resistance genes remain to be identified . We identified the resistance gene corresponding to the cloned avirulence gene ACE1 using pairs of isogenic strains of Magnaporthe grisea differing only by their ACE1 allele . This resistance gene was mapped on the short arm of rice chromosome 8 using progenies from the crosses IR64 ( resistant ) x Azucena ( susceptible ) and Azucena x Bala ( resistant ) . The isogenic strains also permitted the detection of this resistance gene in several rice varieties , including the differential isogenic line C101LAC . Allelism tests permitted us to distinguish this gene from two other resistance genes [ Pi11 and Pi-29 ( t ) ] that are present on the short arm of chromosome 8 . Segregation analysis in F ( 2 ) populations was in agreement with the existence of a single dominant gene , designated as Pi33 . Finally , Pi33 was finely mapped between two molecular markers of the rice genetic map that are separated by a distance of 1 . 6 cM . Detection of Pi33 in different semi-dwarf indica varieties indicated that this gene could originate from either one or a few varieties .
Matching Sentences:
[ Sen. 7, subscore: 1.00 ]: Segregation analysis in F ( 2 ) populations was in agreement with the existence of a single dominant gene , designated as Pi33 .
[ Sen. 8, subscore: 1.00 ]: Finally , Pi33 was finely mapped between two molecular markers of the rice genetic map that are separated by a distance of 1 . 6 cM .
[ Sen. 9, subscore: 1.00 ]: Detection of Pi33 in different semi-dwarf indica varieties indicated that this gene could originate from either one or a few varieties .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 2.00
Title: Magnaporthe grisea avirulence gene ACE1 belongs to an infection-specific gene cluster involved in secondary metabolism .
Author: Collemare J Pianfetti M Houlle AE Morin D Camborde L Gagey MJ Barbisan C Fudal I Lebrun MH Bohnert HU
Journal: New Phytol Citation: V : 179 P : 196-208 Year: 2008 Type: In-Process
Literature: oryza Field: abstract Doc ID: pub18433432
Abstract: The avirulence gene ACE1 from the rice blast fungus Magnaporthe grisea encodes a polyketide synthase ( PKS ) fused to a nonribosomal peptide synthetase ( NRPS ) probably involved in the biosynthesis of a secondary metabolite recognized by Pi33 resistant rice ( Oryza sativa ) cultivars . Analysis of the M grisea genome revealed that ACE1 is located in a cluster of 15 genes , of which 14 are potentially involved in secondary metabolism as they encode enzymes such as a second PKS-NRPS ( SYN2 ) , two enoyl reductases ( RAP1 and RAP2 ) and a putative Zn ( II ) ( 2 ) Cys ( 6 ) transcription factor ( BC2 ) . These 15 genes are specifically expressed during penetration into the host plant , defining an infection-specific gene cluster . A pORF3-GFP transcriptional fusion showed that the highly expressed ORF3 gene from the ACE1 cluster is only expressed in appressoria , as is ACE1 . Phenotypic analysis of deletion or disruption mutants of SYN2 and RAP2 showed that they are not required for avirulence in Pi33 rice cultivars , unlike ACE1 . Inactivation of other genes was unsuccessful because targeted gene replacement and disruption were inefficient at this locus . Overall , the ACE1 gene cluster displays an infection-specific expression pattern restricted to the penetration stage which is probably controlled at the transcriptional level and reflects regulatory networks specific to early stages of infection .
Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: The avirulence gene ACE1 from the rice blast fungus Magnaporthe grisea encodes a polyketide synthase ( PKS ) fused to a nonribosomal peptide synthetase ( NRPS ) probably involved in the biosynthesis of a secondary metabolite recognized by Pi33 resistant rice ( Oryza sativa ) cultivars .
[ Sen. 5, subscore: 1.00 ]: Phenotypic analysis of deletion or disruption mutants of SYN2 and RAP2 showed that they are not required for avirulence in Pi33 rice cultivars , unlike ACE1 .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: A putative polyketide synthase/peptide synthetase from Magnaporthe grisea signals pathogen attack to resistant rice .
Author: Bhnert HU Fudal I Dioh W Tharreau D Notteghem JL Lebrun MH .
Journal: Plant Cell Citation: V : 16 ( 9 ) P : 2499-513 Year: 2004 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15319478
Abstract: Isolates of the rice blast fungus Magnaporthe grisea that carry the gene encoding Avirulence Conferring Enzyme1 ( ACE1 ) are specifically recognized by rice ( Oryza sativa ) cultivars carrying the resistance gene Pi33 . This recognition enables resistant plants to activate a defense response . ACE1 was isolated by map-based cloning and encodes a putative hybrid between a polyketide synthase and a nonribosomal peptide synthetase , enzymes involved in microbial secondary metabolism . ACE1 is expressed exclusively during fungal penetration of host leaves , the time point at which plant defense reactions are triggered . Ace1 appears to be localized in the cytoplasm of the appressorium . Mutation of the putative catalytic site of the beta-ketoacyl synthase domain of Ace1 abolishes recognition of the fungus by resistant rice . This suggests that Ace1 biosynthetic activity is required for avirulence . Our results are consistent with the hypothesis that the fungal signal recognized by resistant rice plants is the secondary metabolite whose synthesis depends on Ace1 .
Matching Sentences:
[ Sen. 1, subscore: 1.00 ]: Isolates of the rice blast fungus Magnaporthe grisea that carry the gene encoding Avirulence Conferring Enzyme1 ( ACE1 ) are specifically recognized by rice ( Oryza sativa ) cultivars carrying the resistance gene Pi33 .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Expression of Magnaporthe grisea avirulence gene ACE1 is connected to the initiation of appressorium-mediated penetration .
Author: Fudal I Collemare J Bhnert HU Melayah D Lebrun MH .
Journal: Eukaryotic Cell Citation: V : 6 ( 3 ) P : 546-54 Year: 2007 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub17142568
Abstract: Magnaporthe grisea is responsible for a devastating fungal disease of rice called blast Current control of this disease relies on resistant rice cultivars that recognize M grisea signals corresponding to specific secreted proteins encoded by avirulence genes . The M grisea ACE1 avirulence gene differs from others , since it controls the biosynthesis of a secondary metabolite likely recognized by rice cultivars carrying the Pi33 resistance gene . Using a transcriptional fusion between ACE1 promoter and eGFP , we showed that ACE1 is only expressed in appressoria during fungal penetration into rice and barley leaves , onion skin , and cellophane membranes . ACE1 is almost not expressed in appressoria differentiated on Teflon and Mylar artificial membranes . ACE1 expression is not induced by cellophane and plant cell wall components , demonstrating that it does not require typical host plant compounds . Cyclic AMP ( cAMP ) signaling mutants delta cpkA and delta mac1 sum1-99 and tetraspanin mutant delta pls1 : : hph differentiate melanized appressoria with normal turgor but are unable to penetrate host plant leaves . ACE1 is normally expressed in these mutants , suggesting that it does not require cAMP signaling or a successful penetration event . ACE1 is not expressed in appressoria of the buf1 : : hph mutant defective for melanin biosynthesis and appressorial turgor . The addition of hyperosmotic solutes to buf1 : : hph appressoria restores appressorial development and ACE1 expression . Treatments of young wild-type appressoria with actin and tubulin inhibitors reduce both fungal penetration and ACE1 expression . These experiments suggest that ACE1 appressorium-specific expression does not depend on host plant signals but is connected to the onset of appressorium-mediated penetration .
Matching Sentences:
[ Sen. 2, subscore: 1.00 ]: The M grisea ACE1 avirulence gene differs from others , since it controls the biosynthesis of a secondary metabolite likely recognized by rice cultivars carrying the Pi33 resistance gene .
Supplemental links/files: reference in endnote online text related articles pubmed citation
Score: 1.00
Title: Early and specific gene expression triggered by rice resistance gene Pi33 in response to infection by ACE1 avirulent blast fungus .
Author: Vergne E Ballini E Marques S Sidi Mammar B Droc G Gaillard S Bourot S DeRose R Tharreau D Nottghem JL Lebrun MH Morel JB .
Journal: New Phytol . Citation: V : 174 ( 1 ) P : 159-71 Year: Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub17335506
Abstract: * Our view of genes involved in rice disease resistance is far from complete . Here we used a gene-for-gene relationship corresponding to the interaction between atypical avirulence gene ACE1 from Magnaporthe grisea and rice resistance gene Pi33 to better characterize early rice defence responses induced during such interaction . * Rice genes differentially expressed during early stages of Pi33/ACE1 interaction were identified using DNA chip-based differential hybridization and QRT-PCR survey of the expression of known and putative regulators of disease resistance . * One hundred genes were identified as induced or repressed during rice defence response , 80% of which are novel , including resistance gene analogues . Pi33/ACE1 interaction also triggered the up-regulation of classical PR defence genes and a massive down-regulation of chlorophyll a/b binding genes . Most of these differentially expressed genes were induced or repressed earlier in Pi33/ACE1 interaction than in the gene-for-gene interaction involving Nipponbare resistant cultivar . * Besides demonstrating that an ACE1/Pi33 interaction induced classical and specific expression patterns , this work provides a list of new genes likely to be involved in rice disease resistance .
Matching Sentences:
[ Sen. 2, subscore: 1.00 ]: Here we used a gene-for-gene relationship corresponding to the interaction between atypical avirulence gene ACE1 from Magnaporthe grisea and rice resistance gene Pi33 to better characterize early rice defence responses induced during such interaction .
Supplemental links/files: reference in endnote online text related articles pubmed citation
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