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Registro Completo |
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
21/11/2013 |
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Data da última atualização: |
21/11/2013 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
STEEGE, H. T.; PITMAN, N. C. A.; SABATIER, D.; BARALOTO, C.; SALOMÃO, R. P.; GUEVARA, J. E.; PHILLIPS, O. L.; CASTILHO, C. V.; MAGNUSSON, W. E.; MOLINO, J.-F.; MONTEAGUDO, A.; VARGAS, P. N.; MONTERO, J. C.; FELDPAUSCH, T. R.; CORONADO, E. N. H.; KILLEEN, T. J.; MOSTACEDO, B.; VASQUEZ, R.; ASSIS, R. L.; TERBORGH, J.; WITTMANN, F.; ANDRADE, A.; LAURANCE, W. F.; LAURANCE, S. G. W.; MARIMON, B. S.; MARIMON JUNIOR, B.-H.; VIEIRA, I. C. G.; AMARAL, I. L.; BRIENEN, R.; CASTELLANOS, H.; CÁRDENAS LÓPEZ, D.; DUIVENVOORDEN, J. F.; MOGOLLÓN, H. F.; MATOS, F. D. de A.; DÁVILA, N.; GARCÍA-VILLACORTA, R.; DIAZ, P. R. S.; COSTA, F.; EMILIO, T.; LEVIS, C.; SCHIETTI, J.; SOUZA, P.; ALONSO, A.; DALLMEIER, F.; MONTOYA, A. J. D.; PIEDADE, M. T. F.; ARAUJO-MURAKAMI, A.; ARROYO, L.; GRIBEL, R.; FINE, P. V. A.; PERES, C. A.; TOLEDO, M.; AYMARD C. G. A.; BAKER, T. R.; CERÓN, C.; ENGEL, J.; HENKEL, T. W.; MAAS, P.; PETRONELLI, P.; STROPP, J.; ZARTMAN, C. E.; DALY, D.; NEILL, D.; SILVEIRA, M.; PAREDES, M. R.; CHAVE, J.; LIMA FILHO, D. de A.; JORGENSEN, P. M.; FUENTES, A.; SCHÖNGART, J.; VALVERDE, F. C.; DI FIORE, A.; JIMENEZ, E. M.; PEÑUELA MORA, M. C.; PHILLIPS, J. F.; RIVAS, G.; ANDEL, T. R. van; HILDEBRAND, P. von; HOFFMAN, B.; ZENT, E. L.; MALHI, Y.; PRIETO, A.; RUDAS, A.; RUSCHEL, A. R.; SILVA, N.; VOS, V.; ZENT, S.; OLIVEIRA, A. A.; SCHUTZ, A. C.; GONZALES, T.; NASCIMENTO, M. T.; RAMIREZ-ANGULO, H.; SIERRA, R.; TIRADO, M.; MEDINA, M. N. U.; HEIJDEN, G. van der; VELA, C. I. A.; TORRE, E. V.; VRIESENDORP, C.; WANG, O.; YOUNG, K. R.; BAIDER, C.; BALSLEV, H.; FERREIRA, C.; MESONES, I.; TORRES-LEZAMA, A.; GIRALDO, L. E. U.; ZAGT, R.; ALEXIADES, M. N.; HERNANDEZ, L.; HUAMANTUPA-CHUQUIMACO, I.; MILLIKEN, W.; CUENCA, W. P.; PAULETTO, D.; SANDOVAL, E. V.; GAMARRA, L. V.; DEXTER, K. G.; FEELEY, K.; LOPEZ-GONZALEZ, G.; SILMAN, M. R. |
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Afiliação: |
HANS TER STEEGE, NATURALIS BIODIVERSITY CENTER / UTRECHT UNIVERSITY; NIGEL C. A. PITMAN, Nicholas School of the Environment / The Field Museum; DANIEL SABATIER, Institut de Recherche pour le Développement, UMR Architecture, Fonctionnement et Évolution des plantes; CHRISTOPHER BARALOTO, Institut National de la Recherche Agronomique; RAFAEL P. SALOMÃO, Ministério da Ciência, Tecnologia e Inovação/Museu Paraense Emílio Goeldi; JUAN ERNESTO GUEVARA, University of California; OLIVER L. PHILLIPS, School of Geography, University of Leeds; CAROLINA VOLKMER DE CASTILHO, CPAF-RR; WILLIAM E. MAGNUSSON, INPA; JEAN-FRANÇOIS MOLINO, Institut de Recherche pour le Développement, UMR Architecture, Fonctionnement et Évolution des plantes; ABEL MONTEAGUDO, Jardín Botánico de Missouri; PERCY NÚÑEZ VARGAS, Universidad Nacional de San Antonio Abad del Cusco; JUAN CARLOS MONTERO, BOLFOR / INPA; TED R. FELDPAUSCH, School of Geography, University of Leeds / College of Life and Environmental Sciences, University of Exeter; EURÍDICE N. HONORIO CORONADO, Instituto de Investigaciones de la Amazonía Peruana / School of Geography, University of Leeds; TIM J. KILLEEN, WWF; BONIFACIO MOSTACEDO, Universidad Autónoma Gabriel René Moreno; RODOLFO VASQUEZ, Jardín Botánico de Missouri; RAFAEL L. ASSIS, INPA / Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences (UMB); JOHN TERBORGH, Center for Tropical Conservation, Nicholas School of the Environment, Duke University; FLORIAN WITTMANN, Max Planck Institute for Chemistry, Biogeochemistry; ANA ANDRADE, INPA; WILLIAM F. LAURANCE, Centre for Tropical Environmental and Sustainability Science (TESS) and School of Marine and Tropical Biology, James Cook University; SUSAN G. W. LAURANCE, Centre for Tropical Environmental and Sustainability Science (TESS) and School of Marine and Tropical Biology, James Cook University; BEATRIZ S. MARIMON, Universidade do Estado de Mato Grosso; BEN-HUR MARIMON JUNIOR, Universidade do Estado de Mato Grosso; IMA CÉLIA GUIMARÃES VIEIRA, MPEG; IÊDA LEÃO AMARAL, Projeto TEAM / INPA; ROEL BRIENEN, School of Geography, University of Leeds; HERNÁN CASTELLANOS, Universidad Nacional Experimental de Guayana; DAIRON CÁRDENAS LÓPEZ, SINCHI (Instituto Amazónico de Investigaciones Científicas) Herbario Amazónico Colombiano; JOOST F. DUIVENVOORDEN, Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam; HUGO F. MOGOLLÓN, Endangered Species Coalition; FRANCISCA DIONÍZIA DE ALMEIDA MATOS, INPA; NÁILARETT DÁVILA, Universidade Estadual de Campinas; ROOSEVELT GARCÍA-VILLACORTA, Institute of Molecular Plant Sciences, University of Edinburgh / Royal Botanic Garden of Edinburgh; PABLO ROBERTO STEVENSON DIAZ, Laboratorio de Ecología de Bosques Tropicales y Primatología, Universidad de los Andes; FLAVIA COSTA, INPA; THAISE EMILIO, INPA; CAROLINA LEVIS, INPA; JULIANA SCHIETTI, INPA; PRISCILA SOUZA, INPA; ALFONSO ALONSO, Smithsonian Conservation Biology Institute; FRANCISCO DALLMEIER, Smithsonian Conservation Biology Institute; ALVARO JAVIER DUQUE MONTOYA, Universidad Nacional de Colombia; MARIA TERESA FERNANDEZ PIEDADE, INPA; ALEJANDRO ARAUJO-MURAKAMI, Museo de Historia Natural Noel Kempff Mercado; LUZMILA ARROYO, Museo de Historia Natural Noel Kempff Mercado; ROGERIO GRIBEL, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro; PAUL V. A. FINE, Department of Integrative Biology, University of California; CARLOS A. PERES, School of Environmental Sciences, University of East Anglia; MARISOL TOLEDO, Instituto Boliviano de Investigación Forestal, Universidad Autónoma Gabriel René Moreno; GERARDO A. AYMARD C., UNELLEZ; TIM R. BAKER, School of Geography, University of Leeds; CARLOS CERÓN, Herbario Alfredo Paredes (QAP), Universidad Central del Ecuador; JULIEN ENGEL, CNRS, UMR Ecologie des Forêts de Guyane; TERRY W. HENKEL, Department of Biological Sciences, Humboldt State University; PAUL MAAS, Naturalis Biodiversity Center; PASCAL PETRONELLI, La Recherche Agronomique pour le Développement (CIRAD); JULIANA STROPP, Land Resource and Management Unit, Joint Research Centre of the European Commission; CHARLES EUGENE ZARTMAN, INPA; DOUGLAS DALY, New York Botanical Garden; DAVID NEILL, Universidad Estatal Amazónica; MARCOS SILVEIRA, Museu Universitário, Universidade Federal do Acre; MARCOS RIOS PAREDES, Servicios de Biodiversidad EIRL; JEROME CHAVE, CNRS and Université Paul Sabatier; DIÓGENES DE ANDRADE LIMA FILHO, INPA; PETER MOLLER JORGENSEN, Missouri Botanical Garden; ALFREDO FUENTES, Herbario Nacional de Bolivia / Missouri Botanical Garden; JOCHEN SCHÖNGART, Max Planck Institute for Chemistry, Biogeochemistry; FERNANDO CORNEJO VALVERDE, Andes to Amazon Biodiversity Program; ANTHONY DI FIORE, Department of Anthropology, University of Texas at Austin; ELIANA M. JIMENEZ, Grupo de Ecología de Ecosistemas Terrestres Tropicales, Universidad Nacional de Colombia Sede Amazonia; MARIA CRISTINA PEÑUELA MORA, Grupo de Ecología de Ecosistemas Terrestres Tropicales, Universidad Nacional de Colombia Sede Amazonia; JUAN FERNANDO PHILLIPS, Fundación Puerto Rastrojo; GONZALO RIVAS, Wildlife Ecology and Conservation and Quantitative Spatial Ecology, University of Florida; TINDE R. VAN ANDEL, Naturalis Biodiversity Center; PATRICIO VON HILDEBRAND, Fundación Puerto Rastrojo; BRUCE HOFFMAN, Naturalis Biodiversity Center; EGLÉE L. ZENT, Laboratory of Human Ecology, Instituto Venezolano de Investigaciones Científicas; YADVINDER MALHI, Environmental Change Institute, School of Geography and the Environment, University of Oxford; ADRIANA PRIETO, Instituto de Ciencias Naturales, Universidad Nacional de Colombia; AGUSTÍN RUDAS, Instituto de Ciencias Naturales, Universidad Nacional de Colombia; ADEMIR ROBERTO RUSCHEL, CPATU; NATALINO SILVA, UFRA; VICENT VOS, Universidad Autónoma del Beni; STANFORD ZENT, Laboratory of Human Ecology, Instituto Venezolano de Investigaciones Científicas; ALEXANDRE A. OLIVEIRA, Universidade de São Paulo, Instituto de Biociências, Departamento Ecologia; ANGELA CANO SCHUTZ, Laboratorio de Ecología de Bosques Tropicales y Primatología, Universidad de los Andes; THERANY GONZALES, Amazon Center for Environmental Education and Research Foundation; MARCELO TRINDADE NASCIMENTO, Laboratório de Ciências Ambientais, Universidade Estadual do Norte Fluminense; HIRMA RAMIREZ-ANGULO, INDEFOR; RODRIGO SIERRA, Geoinformática y Sistemas; MILTON TIRADO, Geoinformática y Sistemas; MARIA NATALIA UMAÑA MEDINA, Laboratorio de Ecología de Bosques Tropicales y Primatología, Universidad de los Andes; GEERTJE VAN DER HEIJDEN, Department of Biological Sciences, University of Wisconsin-Milwaukee / Smithsonian Tropical Research Institute; CESAR I. A. VELA, Facultad de Ciencias Forestales y Medio Ambiente, Universidad Nacional de San Antonio Abad del Cusco; EMILIO VILANOVA TORRE, INDEFOR; CORINE VRIESENDORP, The Field Museum; OPHELIA WANG, Northern Arizona University; KENNETH R. YOUNG, Geography and the Environment, University of Texas; CLAUDIA BAIDER, Universidade de São Paulo, Instituto de Biociências, Departamento Ecologia / The Mauritius Herbarium; HENRIK BALSLEV, University of Aarhus; CID FERREIRA, INPA; ITALO MESONES, Department of Integrative Biology, University of California; ARMANDO TORRES-LEZAMA, Universidad de los Andes; LIGIA ESTELA URREGO GIRALDO, Universidad Nacional de Colombia, Departamento de Ciencias Forestales; RODERICK ZAGT, Tropenbos International; MIGUEL N. ALEXIADES, School of Anthropology and Conservation, Marlowe Building, University of Kent; LIONEL HERNANDEZ, Universidad Nacional Experimental de Guayana; ISAU HUAMANTUPA-CHUQUIMACO, Herbario CUZ, Universidad Nacional San Antonio Abad del Cusco; WILLIAM MILLIKEN, Royal Botanic Gardens; WALTER PALACIOS CUENCA, Universidad Técnica del Norte/Herbario Nacional del Euador; DANIELA PAULETTO, Serviço Florestal Brasileiro; ELVIS VALDERRAMA SANDOVAL, Department of Biology, University of Missouri–Saint Louis / Facultad de Biología, Universidad Nacional de la Amazonía Peruana; LUIS VALENZUELA GAMARRA, Jardín Botánico de Missouri; KYLE G. DEXTER, School of Geosciences, University of Edinburgh; KEN FEELEY, Department of Biological Sciences, Florida International University / Fairchild Tropical Botanic Garden; GABRIELA LOPEZ-GONZALEZ, School of Geography, University of Leeds; MILES R. SILMAN, Biology Department and Center for Energy, Environment and Sustainability, Wake Forest University. |
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Título: |
Hyperdominance in the Amazonian tree flora. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Science, v. 342, n. 6156, Oct. 2013. |
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DOI: |
10.1126/science.1243092 |
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Idioma: |
Inglês |
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Conteúdo: |
The vast extent of the Amazon Basin has historically restricted the study of its tree communities to the local and regional scales. Here, we provide empirical data on the commonness, rarity, and richness of lowland tree species across the entire Amazon Basin and Guiana Shield (Amazonia), collected in 1170 tree plots in all major forest types. Extrapolations suggest that Amazonia harbors roughly 16,000 tree species, of which just 227 (1.4%) account for half of all trees. Most of these are habitat specialists and only dominant in one or two regions of the basin. We discuss some implications of the finding that a small group of species?less diverse than the North American tree flora?accounts for half of the world?s most diverse tree community. |
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Thesagro: |
Flora; Floresta. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 04783naa a2201597 a 4500
001 1971780
005 2013-11-21
008 2013 bl --- 0-- u #d
024 7 $a10.1126/science.1243092$2DOI
100 1 $aSTEEGE, H. T.
245 $aHyperdominance in the Amazonian tree flora.
260 $c2013
520 $aThe vast extent of the Amazon Basin has historically restricted the study of its tree communities to the local and regional scales. Here, we provide empirical data on the commonness, rarity, and richness of lowland tree species across the entire Amazon Basin and Guiana Shield (Amazonia), collected in 1170 tree plots in all major forest types. Extrapolations suggest that Amazonia harbors roughly 16,000 tree species, of which just 227 (1.4%) account for half of all trees. Most of these are habitat specialists and only dominant in one or two regions of the basin. We discuss some implications of the finding that a small group of species?less diverse than the North American tree flora?accounts for half of the world?s most diverse tree community.
650 $aAmazonia
650 $aFlora
650 $aFloresta
700 1 $aPITMAN, N. C. A.
700 1 $aSABATIER, D.
700 1 $aBARALOTO, C.
700 1 $aSALOMÃO, R. P.
700 1 $aGUEVARA, J. E.
700 1 $aPHILLIPS, O. L.
700 1 $aCASTILHO, C. V.
700 1 $aMAGNUSSON, W. E.
700 1 $aMOLINO, J.-F.
700 1 $aMONTEAGUDO, A.
700 1 $aVARGAS, P. N.
700 1 $aMONTERO, J. C.
700 1 $aFELDPAUSCH, T. R.
700 1 $aCORONADO, E. N. H.
700 1 $aKILLEEN, T. J.
700 1 $aMOSTACEDO, B.
700 1 $aVASQUEZ, R.
700 1 $aASSIS, R. L.
700 1 $aTERBORGH, J.
700 1 $aWITTMANN, F.
700 1 $aANDRADE, A.
700 1 $aLAURANCE, W. F.
700 1 $aLAURANCE, S. G. W.
700 1 $aMARIMON, B. S.
700 1 $aMARIMON JUNIOR, B.-H.
700 1 $aVIEIRA, I. C. G.
700 1 $aAMARAL, I. L.
700 1 $aBRIENEN, R.
700 1 $aCASTELLANOS, H.
700 1 $aCÁRDENAS LÓPEZ, D.
700 1 $aDUIVENVOORDEN, J. F.
700 1 $aMOGOLLÓN, H. F.
700 1 $aMATOS, F. D. de A.
700 1 $aDÁVILA, N.
700 1 $aGARCÍA-VILLACORTA, R.
700 1 $aDIAZ, P. R. S.
700 1 $aCOSTA, F.
700 1 $aEMILIO, T.
700 1 $aLEVIS, C.
700 1 $aSCHIETTI, J.
700 1 $aSOUZA, P.
700 1 $aALONSO, A.
700 1 $aDALLMEIER, F.
700 1 $aMONTOYA, A. J. D.
700 1 $aPIEDADE, M. T. F.
700 1 $aARAUJO-MURAKAMI, A.
700 1 $aARROYO, L.
700 1 $aGRIBEL, R.
700 1 $aFINE, P. V. A.
700 1 $aPERES, C. A.
700 1 $aTOLEDO, M.
700 1 $aAYMARD C. G. A.
700 1 $aBAKER, T. R.
700 1 $aCERÓN, C.
700 1 $aENGEL, J.
700 1 $aHENKEL, T. W.
700 1 $aMAAS, P.
700 1 $aPETRONELLI, P.
700 1 $aSTROPP, J.
700 1 $aZARTMAN, C. E.
700 1 $aDALY, D.
700 1 $aNEILL, D.
700 1 $aSILVEIRA, M.
700 1 $aPAREDES, M. R.
700 1 $aCHAVE, J.
700 1 $aLIMA FILHO, D. de A.
700 1 $aJORGENSEN, P. M.
700 1 $aFUENTES, A.
700 1 $aSCHÖNGART, J.
700 1 $aVALVERDE, F. C.
700 1 $aDI FIORE, A.
700 1 $aJIMENEZ, E. M.
700 1 $aPEÑUELA MORA, M. C.
700 1 $aPHILLIPS, J. F.
700 1 $aRIVAS, G.
700 1 $aANDEL, T. R. van
700 1 $aHILDEBRAND, P. von
700 1 $aHOFFMAN, B.
700 1 $aZENT, E. L.
700 1 $aMALHI, Y.
700 1 $aPRIETO, A.
700 1 $aRUDAS, A.
700 1 $aRUSCHEL, A. R.
700 1 $aSILVA, N.
700 1 $aVOS, V.
700 1 $aZENT, S.
700 1 $aOLIVEIRA, A. A.
700 1 $aSCHUTZ, A. C.
700 1 $aGONZALES, T.
700 1 $aNASCIMENTO, M. T.
700 1 $aRAMIREZ-ANGULO, H.
700 1 $aSIERRA, R.
700 1 $aTIRADO, M.
700 1 $aMEDINA, M. N. U.
700 1 $aHEIJDEN, G. van der
700 1 $aVELA, C. I. A.
700 1 $aTORRE, E. V.
700 1 $aVRIESENDORP, C.
700 1 $aWANG, O.
700 1 $aYOUNG, K. R.
700 1 $aBAIDER, C.
700 1 $aBALSLEV, H.
700 1 $aFERREIRA, C.
700 1 $aMESONES, I.
700 1 $aTORRES-LEZAMA, A.
700 1 $aGIRALDO, L. E. U.
700 1 $aZAGT, R.
700 1 $aALEXIADES, M. N.
700 1 $aHERNANDEZ, L.
700 1 $aHUAMANTUPA-CHUQUIMACO, I.
700 1 $aMILLIKEN, W.
700 1 $aCUENCA, W. P.
700 1 $aPAULETTO, D.
700 1 $aSANDOVAL, E. V.
700 1 $aGAMARRA, L. V.
700 1 $aDEXTER, K. G.
700 1 $aFEELEY, K.
700 1 $aLOPEZ-GONZALEZ, G.
700 1 $aSILMAN, M. R.
773 $tScience$gv. 342, n. 6156, Oct. 2013.
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Registro original: |
Embrapa Roraima (CPAF-RR) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
29/08/2019 |
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Data da última atualização: |
24/01/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
REIS, C. O. dos; MAGALHAES, P. C.; AVILA, R. G.; ALMEIDA, L. G.; RABELO, V. M.; CARVALHO, D. T.; CABRAL, D. F.; KARAM, D.; SOUZA, T. C. de. |
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Afiliação: |
Caroline Oliveira dos Reis, Universidade Federal de Alfenas; PAULO CESAR MAGALHAES, CNPMS; Roniel Geraldo Avila, Universidade Federal de Lavras; Lorena Gabriela Almeida, Universidade Federal de Lavras; Valquíria Mikaela Rabelo, Universidade Federal de Alfenas; Diogo Teixeira Carvalho, Universidade Federal de Alfenas; Daniela Ferreira Cabral, Universidade Federal de Alfenas; DECIO KARAM, CNPMS; Thiago Correa de Souza, Universidade Federal de Alfenas. |
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Título: |
Action of N-succinyl and N,O-dicarboxymethyl chitosan derivatives on chlorophyll photosynthesis and fluorescence in drought-sensitive maize. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Journal of Plant Growth Regulation, v. 38, p. 619-630, 2019. |
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DOI: |
10.1007/s00344-018-9877-9 |
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Idioma: |
Inglês |
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Conteúdo: |
Chitosan induces plant tolerance to various abiotic stresses, including water deficit. However, its use may be limited, due to its constitution and low solubility in water. Thus, chemical modifications were proposed in this study with the objective of potentializing its biological effects in maize plants. The derivatives were semi-synthesized (N-succinyl and N,O-dicarboxymethyl) and, together with chitosan, they were applied, via the leaf, in a drought-sensitive maize hybrid (BRS1030) under pre-flowering water deficit. The water deficit was maintained for 15 days and the analyses were performed at the beginning and end of stress, and also in rehydration. Leaf water potential, gas exchange, chlorophyll fluorescence, and content of chloroplastidic pigments were evaluated. The use of the derivatives modulated photosynthesis parameters, affecting the involved mechanisms, such as stomatal activity, water use efficiency and photosystem II activity. Chlorophyll fluorescence indicated that the antenna complex was damaged by the water deficit condition, with a decrease in the energy flux in the electron transport chain and in the photochemical phase of photosynthesis. However, the spraying of chitosan derivatives induced tolerance to water deficit, suggesting that chitosan derivatives are more bioavailable to plants. Water stress decreases pigment content, but both the application of chitosan and derivatives increased these contents. It is concluded that chitosan derivatives improved the photosynthetic parameters in maize susceptible to drought, inducing tolerance to this stress, and the possible reasons and consequences are discussed. MenosChitosan induces plant tolerance to various abiotic stresses, including water deficit. However, its use may be limited, due to its constitution and low solubility in water. Thus, chemical modifications were proposed in this study with the objective of potentializing its biological effects in maize plants. The derivatives were semi-synthesized (N-succinyl and N,O-dicarboxymethyl) and, together with chitosan, they were applied, via the leaf, in a drought-sensitive maize hybrid (BRS1030) under pre-flowering water deficit. The water deficit was maintained for 15 days and the analyses were performed at the beginning and end of stress, and also in rehydration. Leaf water potential, gas exchange, chlorophyll fluorescence, and content of chloroplastidic pigments were evaluated. The use of the derivatives modulated photosynthesis parameters, affecting the involved mechanisms, such as stomatal activity, water use efficiency and photosystem II activity. Chlorophyll fluorescence indicated that the antenna complex was damaged by the water deficit condition, with a decrease in the energy flux in the electron transport chain and in the photochemical phase of photosynthesis. However, the spraying of chitosan derivatives induced tolerance to water deficit, suggesting that chitosan derivatives are more bioavailable to plants. Water stress decreases pigment content, but both the application of chitosan and derivatives increased these contents. It is concluded that chitosan derivatives improved... Mostrar Tudo |
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Palavras-Chave: |
Bioestimulante; Déficit hídrico; Potencial hídrico foliar; Trocas gasosas. |
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Thesagro: |
Milho. |
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Categoria do assunto: |
S Ciências Biológicas |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/201386/1/Action-N-succinyl.pdf
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Marc: |
LEADER 02553naa a2200289 a 4500
001 2111698
005 2020-01-24
008 2019 bl uuuu u00u1 u #d
024 7 $a10.1007/s00344-018-9877-9$2DOI
100 1 $aREIS, C. O. dos
245 $aAction of N-succinyl and N,O-dicarboxymethyl chitosan derivatives on chlorophyll photosynthesis and fluorescence in drought-sensitive maize.$h[electronic resource]
260 $c2019
520 $aChitosan induces plant tolerance to various abiotic stresses, including water deficit. However, its use may be limited, due to its constitution and low solubility in water. Thus, chemical modifications were proposed in this study with the objective of potentializing its biological effects in maize plants. The derivatives were semi-synthesized (N-succinyl and N,O-dicarboxymethyl) and, together with chitosan, they were applied, via the leaf, in a drought-sensitive maize hybrid (BRS1030) under pre-flowering water deficit. The water deficit was maintained for 15 days and the analyses were performed at the beginning and end of stress, and also in rehydration. Leaf water potential, gas exchange, chlorophyll fluorescence, and content of chloroplastidic pigments were evaluated. The use of the derivatives modulated photosynthesis parameters, affecting the involved mechanisms, such as stomatal activity, water use efficiency and photosystem II activity. Chlorophyll fluorescence indicated that the antenna complex was damaged by the water deficit condition, with a decrease in the energy flux in the electron transport chain and in the photochemical phase of photosynthesis. However, the spraying of chitosan derivatives induced tolerance to water deficit, suggesting that chitosan derivatives are more bioavailable to plants. Water stress decreases pigment content, but both the application of chitosan and derivatives increased these contents. It is concluded that chitosan derivatives improved the photosynthetic parameters in maize susceptible to drought, inducing tolerance to this stress, and the possible reasons and consequences are discussed.
650 $aMilho
653 $aBioestimulante
653 $aDéficit hídrico
653 $aPotencial hídrico foliar
653 $aTrocas gasosas
700 1 $aMAGALHAES, P. C.
700 1 $aAVILA, R. G.
700 1 $aALMEIDA, L. G.
700 1 $aRABELO, V. M.
700 1 $aCARVALHO, D. T.
700 1 $aCABRAL, D. F.
700 1 $aKARAM, D.
700 1 $aSOUZA, T. C. de
773 $tJournal of Plant Growth Regulation$gv. 38, p. 619-630, 2019.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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