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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
09/03/2015 |
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Data da última atualização: |
28/01/2019 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
CARVALHO, M. C. C. G. de; NASCIMENTO, L. C.; POLIZEL-PODANOSQUI, A. M.; ROCHA, C. S.; DARBEN, L. M.; LOPES-CAITAR, V. S.; CARAZZOLLE, M. F.; OLIVEIRA, M. L. C. S.; ABDELNOOR, R. V.; MARCELINO-GUIMARÃES, F. C. |
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Afiliação: |
UENP; UNICAMP; UNICAMP; UNESP; RICARDO VILELA ABDELNOOR, CNPSO; FRANCISMAR CORREA MARCELINO GUIMARA, CNPSO. |
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Título: |
The transcriptome interactions between Phakopsora pachykopsora pachyrhizi-soybean. |
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Ano de publicação: |
2014 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 47.; SIMPÓSIO BRASILEIRO DE MOFO BRANCO, 2014, Londrina. Desafios futuros: anais. Londrina: SBF, 2014. 1 CD-ROM. |
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Idioma: |
Inglês |
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Conteúdo: |
The soybean rust caused by the fungus Phakopsora pachyrhizi, has caused serious damage to soybean culture since 2001 in Brazil. Several sources of rust resistance have already been identified; however no cultivar has shown stable resistance to rust. Plants are commonly infected by one or more strains of the fungus causing the breakdown of resistance acquired with the introduction of only one or a few resistance genes. In the last years, different study strategies have allowed the simultaneous monitoring of gene expression in plant-pathogen interaction, broadening our understanding of the molecular mechanisms underlying compatibility and incompatibility responses of soybean to P. pachyrhizi creating new perspectives for the development of a more durable resistance. In this work, we used laser capture microdissection (LCM) to isolate the foliar mesophyll cells of rust infection sites and access site specific processes and regulators in tolerant (compatible interaction) (BRS231) and resistant (incompatible interaction) (PI561356) soybean genotypes. RNA was extracted from the isolated cells, amplified, and sequenced with Solexa plataform. The generated paired-end sequences (54 bp) were mapped to the soybean genome and gene models (http://www.phytozome.net) for the identification of expressed genes and splicing variants. A total of 28,572 and 30,743 genes (RPKM>3) were identified for BRS231 and PI561356, respectively. The remaining reads were used to perform an ab initio assembly of P. pachyrhizi transcripts expressed at 10 dpi in planta. To improve the quality of assembly, P. pachyrhizi sequences from Sanger sequencing reads available at NCBI were trimmed and assembled into contigs and singlets. The two assemblies were merged to form PPGC1.0 comprising 36,350 unique P. pachyrhizi sequences (unisequences) expressed at 10 dpi in planta. By combining LCM with a high performance sequencing (RNA-seq) we were able to access the expression profile of a large number of genes in rust infection sites, including those related to the fungal invasion, and access new transcripts involved in soybean-rust interaction in both, compatible and incompatible interaction. Among the genes identified, the 100 soybean most expressed transcripts (RPKM) in PI561356 and BRS231 rust infection sites were stress-induced genes like cystein proteases, metallothioneins, transcription factors and genes related to protein degradation. Functional annotation of P. pachyrhizi expressed genes was done using the Blast2GO tool resulting in 3,976 transcripts associated with Gene Ontology (GO) terms, and 2,902 to biological process ontology. Biological process ontology was mainly represented by three classes of parent terms: cellular component organization or biogenesis, localization and cellular process. In the last one, two terms: response to stimulus and metabolic process were the most enriched biological process categories. Phakopsora pachyrhizi metabolic processes were strongly represented by sequences with probable function in glycogen and lipid catabolism (debranching enzymes), carbohydrate metabolism (invertases, mannitol dehydrogenases) and nitrogen metabolism (trehalose 6-phosphate synthase). Among sequences associated to response to stimulus were a great number of GO terms also linked to the symbiosis, encompassing mutualism through parasitism term (GO:0044403) including proteins involved in nucleotide binding and DNA metabolic process (nucleases and response to DNA damage stimulus), thiamin metabolic process, proteolysis, response to reactive oxygen species, GTPase mediated signal transduction, inositol-lipid mediated signaling and calmodulin signaling. Using a combination of approaches based on Blast similarities against local databases and an initio prediction, we generated a list of 905 putative secreted proteins from the total of 36,350 unique P. pachyrhizi unisequences. To identify a set of candidate P. pachyrhizi effectors, we grouped the predicted secretome into tribes or families to find those unisequences associated to expanded families. Of the 100 tribes formed, 50 of them contained more than three unisequences. A list of the 169 unisequences were obtained, that combine defining features to be common between effectors, such as small open reading frame ORF size (<250aa), no intracellular function described, enrichement of cystein residues (>3%), and presence of the previously described Y/F/WxC motif. These characteristics are mostly observed among the members of tribes 1, 2 and 17. A temporal expression of 58 candidate effector genes was characterized from spores, germinated spores and infected soybean leaves at 0, 6, 12, 24, 36, 48, 72, 96, 192 and 240 hours after inoculation (hai) using RT-qPCR. Expression analysis showed differential temporal gene expression of these candidate effectors. Heat map analysis revealed three main clusters with coordinated expression of candidates across the infection cycle. The first has candidates expressed in specific steps of infection and almost sequences have motifs common of the effectors as Y/F/WxC. Second cluster has candidates expressed during initial steps of infection that matches germ tube and appressoria formation (0 ? 24 hai) and almost sequences have ?3 cysteine residues, other common features of the effectors. Third cluster has candidates expressed only in contact with the host, suggesting that these candidates are host-induced. This last cluster has a sequence with CFEM domain associated with pathogenicity. Functional analyses are in progress with more promising candidates effectors from second and third cluster to better understand this potential effectors in soybean rust. MenosThe soybean rust caused by the fungus Phakopsora pachyrhizi, has caused serious damage to soybean culture since 2001 in Brazil. Several sources of rust resistance have already been identified; however no cultivar has shown stable resistance to rust. Plants are commonly infected by one or more strains of the fungus causing the breakdown of resistance acquired with the introduction of only one or a few resistance genes. In the last years, different study strategies have allowed the simultaneous monitoring of gene expression in plant-pathogen interaction, broadening our understanding of the molecular mechanisms underlying compatibility and incompatibility responses of soybean to P. pachyrhizi creating new perspectives for the development of a more durable resistance. In this work, we used laser capture microdissection (LCM) to isolate the foliar mesophyll cells of rust infection sites and access site specific processes and regulators in tolerant (compatible interaction) (BRS231) and resistant (incompatible interaction) (PI561356) soybean genotypes. RNA was extracted from the isolated cells, amplified, and sequenced with Solexa plataform. The generated paired-end sequences (54 bp) were mapped to the soybean genome and gene models (http://www.phytozome.net) for the identification of expressed genes and splicing variants. A total of 28,572 and 30,743 genes (RPKM>3) were identified for BRS231 and PI561356, respectively. The remaining reads were used to perform an ab initio assembly... Mostrar Tudo |
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Thesagro: |
Doença de Planta; Ferrugem; Soja. |
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Thesaurus Nal: |
Plant diseases and disorders; Soybean rust; Soybeans. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/119824/1/PALESTRA18.pdf
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Marc: |
LEADER 06688nam a2200289 a 4500
001 2010927
005 2019-01-28
008 2014 bl uuuu u00u1 u #d
100 1 $aCARVALHO, M. C. C. G. de
245 $aThe transcriptome interactions between Phakopsora pachykopsora pachyrhizi-soybean.$h[electronic resource]
260 $aIn: CONGRESSO BRASILEIRO DE FITOPATOLOGIA, 47.; SIMPÓSIO BRASILEIRO DE MOFO BRANCO, 2014, Londrina. Desafios futuros: anais. Londrina: SBF, 2014. 1 CD-ROM.$c2014
520 $aThe soybean rust caused by the fungus Phakopsora pachyrhizi, has caused serious damage to soybean culture since 2001 in Brazil. Several sources of rust resistance have already been identified; however no cultivar has shown stable resistance to rust. Plants are commonly infected by one or more strains of the fungus causing the breakdown of resistance acquired with the introduction of only one or a few resistance genes. In the last years, different study strategies have allowed the simultaneous monitoring of gene expression in plant-pathogen interaction, broadening our understanding of the molecular mechanisms underlying compatibility and incompatibility responses of soybean to P. pachyrhizi creating new perspectives for the development of a more durable resistance. In this work, we used laser capture microdissection (LCM) to isolate the foliar mesophyll cells of rust infection sites and access site specific processes and regulators in tolerant (compatible interaction) (BRS231) and resistant (incompatible interaction) (PI561356) soybean genotypes. RNA was extracted from the isolated cells, amplified, and sequenced with Solexa plataform. The generated paired-end sequences (54 bp) were mapped to the soybean genome and gene models (http://www.phytozome.net) for the identification of expressed genes and splicing variants. A total of 28,572 and 30,743 genes (RPKM>3) were identified for BRS231 and PI561356, respectively. The remaining reads were used to perform an ab initio assembly of P. pachyrhizi transcripts expressed at 10 dpi in planta. To improve the quality of assembly, P. pachyrhizi sequences from Sanger sequencing reads available at NCBI were trimmed and assembled into contigs and singlets. The two assemblies were merged to form PPGC1.0 comprising 36,350 unique P. pachyrhizi sequences (unisequences) expressed at 10 dpi in planta. By combining LCM with a high performance sequencing (RNA-seq) we were able to access the expression profile of a large number of genes in rust infection sites, including those related to the fungal invasion, and access new transcripts involved in soybean-rust interaction in both, compatible and incompatible interaction. Among the genes identified, the 100 soybean most expressed transcripts (RPKM) in PI561356 and BRS231 rust infection sites were stress-induced genes like cystein proteases, metallothioneins, transcription factors and genes related to protein degradation. Functional annotation of P. pachyrhizi expressed genes was done using the Blast2GO tool resulting in 3,976 transcripts associated with Gene Ontology (GO) terms, and 2,902 to biological process ontology. Biological process ontology was mainly represented by three classes of parent terms: cellular component organization or biogenesis, localization and cellular process. In the last one, two terms: response to stimulus and metabolic process were the most enriched biological process categories. Phakopsora pachyrhizi metabolic processes were strongly represented by sequences with probable function in glycogen and lipid catabolism (debranching enzymes), carbohydrate metabolism (invertases, mannitol dehydrogenases) and nitrogen metabolism (trehalose 6-phosphate synthase). Among sequences associated to response to stimulus were a great number of GO terms also linked to the symbiosis, encompassing mutualism through parasitism term (GO:0044403) including proteins involved in nucleotide binding and DNA metabolic process (nucleases and response to DNA damage stimulus), thiamin metabolic process, proteolysis, response to reactive oxygen species, GTPase mediated signal transduction, inositol-lipid mediated signaling and calmodulin signaling. Using a combination of approaches based on Blast similarities against local databases and an initio prediction, we generated a list of 905 putative secreted proteins from the total of 36,350 unique P. pachyrhizi unisequences. To identify a set of candidate P. pachyrhizi effectors, we grouped the predicted secretome into tribes or families to find those unisequences associated to expanded families. Of the 100 tribes formed, 50 of them contained more than three unisequences. A list of the 169 unisequences were obtained, that combine defining features to be common between effectors, such as small open reading frame ORF size (<250aa), no intracellular function described, enrichement of cystein residues (>3%), and presence of the previously described Y/F/WxC motif. These characteristics are mostly observed among the members of tribes 1, 2 and 17. A temporal expression of 58 candidate effector genes was characterized from spores, germinated spores and infected soybean leaves at 0, 6, 12, 24, 36, 48, 72, 96, 192 and 240 hours after inoculation (hai) using RT-qPCR. Expression analysis showed differential temporal gene expression of these candidate effectors. Heat map analysis revealed three main clusters with coordinated expression of candidates across the infection cycle. The first has candidates expressed in specific steps of infection and almost sequences have motifs common of the effectors as Y/F/WxC. Second cluster has candidates expressed during initial steps of infection that matches germ tube and appressoria formation (0 ? 24 hai) and almost sequences have ?3 cysteine residues, other common features of the effectors. Third cluster has candidates expressed only in contact with the host, suggesting that these candidates are host-induced. This last cluster has a sequence with CFEM domain associated with pathogenicity. Functional analyses are in progress with more promising candidates effectors from second and third cluster to better understand this potential effectors in soybean rust.
650 $aPlant diseases and disorders
650 $aSoybean rust
650 $aSoybeans
650 $aDoença de Planta
650 $aFerrugem
650 $aSoja
700 1 $aNASCIMENTO, L. C.
700 1 $aPOLIZEL-PODANOSQUI, A. M.
700 1 $aROCHA, C. S.
700 1 $aDARBEN, L. M.
700 1 $aLOPES-CAITAR, V. S.
700 1 $aCARAZZOLLE, M. F.
700 1 $aOLIVEIRA, M. L. C. S.
700 1 $aABDELNOOR, R. V.
700 1 $aMARCELINO-GUIMARÃES, F. C.
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Registro original: |
Embrapa Soja (CNPSO) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pantanal. Para informações adicionais entre em contato com cpap.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
27/03/1996 |
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Data da última atualização: |
07/04/2017 |
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Autoria: |
CAMPOS, Z. M. da S. |
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Afiliação: |
EMBRAPA. Centro de Pesquisa Agropecuaria do Pantanal (Corumba, MS). |
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Título: |
Effect of habitat on survival of eggs and sex ratio of hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Journal of Herpetology, v.27, n.2, p.127-132, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
Flooding of nests and predation were identified as the major mortality agents of eggs of Caiman crocodilus yacare in Brazil. Nests on floating grass mats and in forest were flooded in 1989, but only floating grass mats nests were flooded in 1990. Predation on eggs was high in forest nests, but my presence may have increased predation. No nest on floating grass mats was attacked by predators. The period of sex determination of C.c.yacare can extend to 40 days of incubation. I predicted nest temperature with a multiple regression model incorporating weather variables during incubation. The predicted nest temperatures for nests on floating grass mats and nests in forest were correlated with the sex ratio of the clutch. High nest temperatures ( > 315 C) produced mostly males, and low nest temperatures ( < 305 C) produced only females. The estimated sex ratio varied between years in nests on floating grass mats, but not in forest nests. Estimated nest temperatures significantly affected the snout-vent lengths of hatchlings but not their masses. Fifty percent of nesting occurred on floating grass mats, so the destruction of this habitat by introduced animals such as the water buffalo (Bubalus babalis) will adversely affect the productivity and hence long-term density of caimans in the Pantanal. |
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Palavras-Chave: |
Preservacao; Preservation; Survival; Yacare. |
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Thesagro: |
Ecologia; Habitat; Jacaré. |
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Thesaurus NAL: |
ecology; Pantanal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01939naa a2200229 a 4500
001 1788009
005 2017-04-07
008 1993 bl --- 0-- u #d
100 1 $aCAMPOS, Z. M. da S.
245 $aEffect of habitat on survival of eggs and sex ratio of hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil.
260 $c1993
520 $aFlooding of nests and predation were identified as the major mortality agents of eggs of Caiman crocodilus yacare in Brazil. Nests on floating grass mats and in forest were flooded in 1989, but only floating grass mats nests were flooded in 1990. Predation on eggs was high in forest nests, but my presence may have increased predation. No nest on floating grass mats was attacked by predators. The period of sex determination of C.c.yacare can extend to 40 days of incubation. I predicted nest temperature with a multiple regression model incorporating weather variables during incubation. The predicted nest temperatures for nests on floating grass mats and nests in forest were correlated with the sex ratio of the clutch. High nest temperatures ( > 315 C) produced mostly males, and low nest temperatures ( < 305 C) produced only females. The estimated sex ratio varied between years in nests on floating grass mats, but not in forest nests. Estimated nest temperatures significantly affected the snout-vent lengths of hatchlings but not their masses. Fifty percent of nesting occurred on floating grass mats, so the destruction of this habitat by introduced animals such as the water buffalo (Bubalus babalis) will adversely affect the productivity and hence long-term density of caimans in the Pantanal.
650 $aecology
650 $aPantanal
650 $aEcologia
650 $aHabitat
650 $aJacaré
653 $aPreservacao
653 $aPreservation
653 $aSurvival
653 $aYacare
773 $tJournal of Herpetology$gv.27, n.2, p.127-132, 1993.
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