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12 matches found in 7 documents. Search time: 0.021 seconds.
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Score: 6.00
Title: Differential induction of a peroxidase gene family during infection of rice by Xanthomonas oryzae pv . oryzae .
Author: Chittoor JM Leach JE White FF .
Journal: Mol . Plant Microbe Interact . Citation: V : 10 ( 7 ) P : 861-71 Year: 1997 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub9304860 Accession (PMID): 9304860
Abstract: Induction of peroxidase has been correlated with resistant interactions between rice and Xanthomonas oryzae pv . oryzae . To assist in analysis of the role of rice peroxidases in plant defense against the bacterial pathogen , three peroxidase genes , POX22 . 3 , POX8 . 1 , and POX5 . 1 , were identified from a rice cDNA library that was constructed from leaves of plants undergoing a resistant reaction . These genes were highly similar in nucleic acid and amino acid sequences and belonged to a gene family . The three genes showed differential expression in infiltrated rice leaves during pathogen interactions and mechanical stress . Only two peroxidase genes , POX8 . 1 and POX22 . 3 , were predominantly expressed during resistant interactions . These two genes also were expressed during susceptible interactions , but induction was delayed compared with resistant interactions . POXgX9 , a fourth peroxidase gene that was isolated from a genomic library , is adjacent to POX22 . 3 in the rice genome and has greater than 90% similarity in nucleotide and amino acid sequence identity to POX22 . 3 . Interestingly , POXgX9 was expressed only in the roots of rice plants . While POX22 . 3 was expressed in both leaves and roots , POX8 . 1 and POX5 . 1 were not detected in roots but were induced in leaves by mechanical wounding at different times after treatment . POX22 . 3 , POX8 . 1 , and POX5 . 1 were estimated to be present in single copies in rice haploid genome . These results indicate that different members of the rice peroxidase gene family are distinctly regulated in response to various environmental cues .
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Score: 2.00
Title: Expression of defense genes and antioxidant defense responses in rice resistance to neck blast at the preliminary heading stage and full heading stage .
Author: Hao Z Wang L Huang F Tao R
Journal: Plant Physiol Biochem Citation: V : 57 P : 222-30 Year: 2012 Type: In-Data-Review
Literature: oryza Field: abstract Doc ID: pub22738867 Accession (PMID): 22738867
Abstract: The rice variety Xiushui227 is resistant to neck blast at three crucial panicle stages ( the booting stage , the preliminary heading stage ( PHS ) , and the full heading stage ( FHS ) ) that controlling neck blast The other rice variety Liangyou6326 is susceptible to neck blast at these three panicle stages . These two varieties were used to analyze the expression patterns of defense genes and antioxidant defense responses at the PHS and FHS , after inoculating the necks in vitro with Magnaporthe oryzae , respectively . All defense genes ( pathogenesis-related genes PR1a , Gns1 ( 1 , 3 ; 1 , 4-beta-glucanase ) , Cht-1 ( chitinase ) , PR4 , PR5 , and PR10a , secondary metabolite pathway genes PAL ( phenylalanine ammonia-lyase ) , CHS ( chalcone synthase ) , and LOX ( lipoxygenase ) , and oxidative stress-related protein genes POX22 . 3 ( peroxidase ) , and PPO ( polyphenol oxidase ) ) used in this experiment except Cht-1 , CHS and PPO could mainly play important roles in the resistance to neck blast at the PHS in Xiushui227 , and CHS and PPO may primarily participate in fighting back against to neck blast at the FHS . Conversely , PR1a , Cht-1 , PR4 , PR10a , CHS , LOX-RLL , and PPO could chiefly play participate in defending Liangyou6326 against neck blast at the FHS , and PR5 , PAL , and POX22 . 3 may be primarily involved in fighting back against to neck blast at the PHS . Furthermore , the antioxidant enzymes superoxide dismutase , peroxidase , and catalase may mainly participate in defending Xiushui227 against neck blast at the PHS and defending Liangyou6326 against neck blast at the FHS , respectively . Therefore oxidative damage is less at the PHS in Xiushui227 and at the FHS in Liangyou6326 , respectively .
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Score: 1.00
Title: Proteomic analysis of pathogen-responsive proteins from rice leaves induced by rice blast fungus , Magnaporthe grisea .
Author: Kim ST Kim SG Hwang DH Kang SY Kim HJ Lee BH Lee JJ Kang KY .
Journal: Proteomics Citation: V : 4 ( 11 ) P : 3569-78 Year: 2004 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub15478215 Accession (PMID): 15478215
Abstract: Proteomic approaches using two-dimensional gel electrophoresis ( 2-DE ) were adopted to identify proteins from rice leaf that are differentially expressed in response to the rice blast fungus , Magnaporthe grisea . Microscopic observation of inoculated leaf with M grisea revealed that callose deposition and hypersensitive response was clearly visible in incompatible interactions but excessive invading hypha with branches were evident in compatible interactions . Proteins were extracted from leaves 24 , 48 , and 72 hours after rice blast fungus inoculation . Eight proteins resolved on the 2-DE gels were induced or increased in the inoculated leaf . Matrix-assisted laser desorption/ionization-time of flight analysis of these differentially displayed proteins showed them to be two receptor-like protein kinases ( RLK ) , two beta-1 . 3-glucanases ( Glu1 , Glu2 ) , thaumatin-like protein ( TLP ) , peroxidase ( POX 22 . 3 ) , probenazole-inducible protein ( PBZ1 ) , and rice pathogenesis-related 10 ( OsPR-10 ) . Of these proteins , RLK , TLP , PBZ , and OsPR-10 proteins were induced more in the incompatible interactions than in compatible ones . A phytohormone , jasmonic acid also induced all eight proteins in leaves . To confirm whether the expression profile is equal to the 2-DE data , seven cDNA clones were used as probes in Northern hybridization experiments using total RNA from leaf it issues inoculated with incompatible and compatible rice blast fungal races . The genes encoding POX22 . 3 , Glu1 , Glu2 , TLP , OsRLK , PBZ1 , and OsPR-10 were activated in inoculated leaves , with TLP , OsRLK , PBZ1 , and OsPR-10 being expressed earlier and more in incompatible than in compatible interactions . These results suggest that early and high induction of these genes may provide host plants with leading edges to defend themselves . The localization of two rice PR-10 proteins , PBZ1 and OsPR-10 , was further examined by immunohistochemical analysis . PBZ1 accumulated highly in mesophyll cells under the attachment site of the appressorium . In contrast , OsPR-10 expression was mainly localized to vascular it issue .
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Score: 1.00
Title: OsWRKY03 , a rice transcriptional activator that functions in defense signaling pathway upstream of OsNPR1 .
Author: Liu XQ Bai XQ Qian Q Wang XJ Chen MS Chu CC .
Journal: Cell Res . Citation: V : 15 ( 8 ) P : 593-603 Year: 2005 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub16117849 Accession (PMID): 16117849
Abstract: WRKY family proteins are a class of plant specific transcription factors that involve in many stress response pathways . It has been shown that one Arabidopsis WRKY protein , AtWRKY29/22 , is activated by MAP kinase signaling cascade and confers resistance to both bacterial and fungal pathogens . However , little is known about the biological roles of WRKY proteins in rice . In this study , we investigated the expression patterns of rice AtWRKY29/22 homolog , OsWRKY03 , under different conditions , and also its possible role involved in plant defense . Our results showed that OsWRKY03 was up-regulated by several defense signaling molecules or different treatments . Further analysis revealed that the expression of OsWRKY03 was light dependent . Transcriptional activation activity of OsWRKY03 was also demonstrated by yeast functional assay . Transient expression of OsWRKY03-GFP fusion protein in onion epidermis cells showed that OsWRKY03 was a nuclear localized protein . OsNPR1 as well as several other pathogenesis-related genes , such as OsPR1b , phenylalanine ammonia-lyase ( ZB8 ) and peroxidase ( POX22 . 3 ) , were induced in OsWRKY03-overexpressing transgenic plants . These results indicated that OsWRKY03 is located upstream of OsNPR1 as a transcriptional activator in salicylic acid ( SA ) -dependent or jasmonic acid ( JA ) -dependent defense signaling cascades .
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Score: 1.00
Title: Rice lesion mimic mutants with enhanced resistance to diseases .
Author: Wu C Bordeos A Madamba MR Baraoidan M Ramos M Wang GL Leach JE Leung H
Journal: Mol Genet Genomics Citation: V : 279 P : 605-19 Year: 2008 Type: MEDLINE
Literature: oryza Field: abstract Doc ID: pub18357468 Accession (PMID): 18357468
Abstract: Lesion mimic mutants are characterized by the formation of necrotic lesions in the absence of pathogens . Such genetic defects often result in enhanced resistance to pathogen infection and constitutive expression of defense response genes . To understand the genetic mechanisms leading to these mutations , we characterized 21 lesion mimic mutants isolated from IR64 rice mutant populations produced by mutagenesis with diepoxybutane ( D ) , gamma rays ( G ) , and fast neutrons ( F ) . Four mutations are controlled by single dominant genes , one of which is inherited maternally . Five lesion mimics are allelic to known spotted leaf ( spl ) mutants spl1 , spl2 , spl3 , or spl6 . In total , 11 new lesion mimic mutations , named spl16 , spl17 , and spl19 through Spl27 , were established based on allelism tests . Two lesion mimics , spl17 and Spl26 showed enhanced resistance to multiple strains of Magnaporthe oryzae , the rice blast pathogen , and Xanthomonas oryzae pv . oryzae , the bacterial blight ( BB ) pathogen . Co-segregation analyses of blast and BB resistance and lesion mimic phenotypes in segregating populations of spl17 and Spl26 indicate that enhanced resistance to the two diseases is conferred by mutations in the lesion mimic genes . A double mutant produced from two independent lesion mimics showed more severe lesions and higher level of resistance to X o . pv . oryzae than their single mutant parents indicating a synergistic effect of the two mutations . In mutants that exhibit enhanced disease resistance to both pathogens , increases in expression of defense response genes PR-10a , POX22 . 3 , and PO-C1 were correlated with lesion mimic development and enhancement of resistance . These lesion mimic mutants may provide essential materials for a comprehensive dissection of the disease resistance pathways in rice .
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