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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Corte. Para informações adicionais entre em contato com cnpgc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
27/03/2012 |
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Data da última atualização: |
30/07/2012 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUSA, A. C. B. de; JANK, L.; CAMPOS, T. de; SFORÇA, D. A.; ZUCCHI, M. I.; SOUZA, A. P. de. |
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Afiliação: |
Adna Cristina Barbosa de Sousa, UNICAMP; LIANA JANK, CNPGC; Tatiana de Campos, UNICAMP; Danilo Augusto Sforça, UNICAMP; Maria Imaculada Zucchi, UNICAMP; Anete Pereira de Souza, UNICAMP. |
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Título: |
Molecular diversity and genetic structure of guineagrass (Panicum maximum Jacq.), a tropical pasture grass. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
Tropical Plant Biology, v.4, n.3-4, p. 185-202, 2011. |
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Idioma: |
Inglês |
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Conteúdo: |
Guineagrass (Panicum maximum Jacq.) is a forage grass found in tropical and subtropical regions. It is an apomictic and tetraploid species from Africa. The objective of this study was to evaluate the genetic diversity of guineagrass accessions sampled from its regions of origin, which is in Tanzania and Kenya. In this study, a total of 396 accessions were analyzed, and a collection of reproducible and informative microsatellites was developed. Thirty microsatellites were employed to characterize these accessions. A total of 576 clones were sequenced from microsatellite-enriched libraries. Flanking primers were designed for 116 microsatellite loci and screened using a sample of 25 guineagrass accessions. The thirty selected polymorphic microsatellites employed in this study produced a total of 192 bands when evaluated in the 396 P. maximum accessions, with an average of 6.4 bands per microsatellite. Four genetic clusters were identified in the collection using STRUCTURE analysis, and these results were confirmed using AMOVA. The largest genetic variation was found within clusters (65.38%). This study revealed that the collection of accessions from the P. maximum region of origin was a rich source of genetic variability. The geographical distances and genetic similarities among accessions did not indicate a significant association between genetic and geographical variation, supporting the natural interspecific crossing between P. maximum, P. infestum and P. trichocladum as the origin of the high genetic variability and the existence of an agamic complex formed by these three species. MenosGuineagrass (Panicum maximum Jacq.) is a forage grass found in tropical and subtropical regions. It is an apomictic and tetraploid species from Africa. The objective of this study was to evaluate the genetic diversity of guineagrass accessions sampled from its regions of origin, which is in Tanzania and Kenya. In this study, a total of 396 accessions were analyzed, and a collection of reproducible and informative microsatellites was developed. Thirty microsatellites were employed to characterize these accessions. A total of 576 clones were sequenced from microsatellite-enriched libraries. Flanking primers were designed for 116 microsatellite loci and screened using a sample of 25 guineagrass accessions. The thirty selected polymorphic microsatellites employed in this study produced a total of 192 bands when evaluated in the 396 P. maximum accessions, with an average of 6.4 bands per microsatellite. Four genetic clusters were identified in the collection using STRUCTURE analysis, and these results were confirmed using AMOVA. The largest genetic variation was found within clusters (65.38%). This study revealed that the collection of accessions from the P. maximum region of origin was a rich source of genetic variability. The geographical distances and genetic similarities among accessions did not indicate a significant association between genetic and geographical variation, supporting the natural interspecific crossing between P. maximum, P. infestum and P. trichocladum as the... Mostrar Tudo |
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Palavras-Chave: |
Diversidade genética; Microssatélite; Panicum maximum Jacq. |
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Thesagro: |
Marcador Molecular; Melhoramento Genético Vegetal; Pastagem. |
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Thesaurus Nal: |
Megathyrsus maximus. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
LEADER 02418naa a2200265 a 4500
001 1920489
005 2012-07-30
008 2011 bl uuuu u00u1 u #d
100 1 $aSOUSA, A. C. B. de
245 $aMolecular diversity and genetic structure of guineagrass (Panicum maximum Jacq.), a tropical pasture grass.$h[electronic resource]
260 $c2011
520 $aGuineagrass (Panicum maximum Jacq.) is a forage grass found in tropical and subtropical regions. It is an apomictic and tetraploid species from Africa. The objective of this study was to evaluate the genetic diversity of guineagrass accessions sampled from its regions of origin, which is in Tanzania and Kenya. In this study, a total of 396 accessions were analyzed, and a collection of reproducible and informative microsatellites was developed. Thirty microsatellites were employed to characterize these accessions. A total of 576 clones were sequenced from microsatellite-enriched libraries. Flanking primers were designed for 116 microsatellite loci and screened using a sample of 25 guineagrass accessions. The thirty selected polymorphic microsatellites employed in this study produced a total of 192 bands when evaluated in the 396 P. maximum accessions, with an average of 6.4 bands per microsatellite. Four genetic clusters were identified in the collection using STRUCTURE analysis, and these results were confirmed using AMOVA. The largest genetic variation was found within clusters (65.38%). This study revealed that the collection of accessions from the P. maximum region of origin was a rich source of genetic variability. The geographical distances and genetic similarities among accessions did not indicate a significant association between genetic and geographical variation, supporting the natural interspecific crossing between P. maximum, P. infestum and P. trichocladum as the origin of the high genetic variability and the existence of an agamic complex formed by these three species.
650 $aMegathyrsus maximus
650 $aMarcador Molecular
650 $aMelhoramento Genético Vegetal
650 $aPastagem
653 $aDiversidade genética
653 $aMicrossatélite
653 $aPanicum maximum Jacq
700 1 $aJANK, L.
700 1 $aCAMPOS, T. de
700 1 $aSFORÇA, D. A.
700 1 $aZUCCHI, M. I.
700 1 $aSOUZA, A. P. de
773 $tTropical Plant Biology$gv.4, n.3-4, p. 185-202, 2011.
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Registro original: |
Embrapa Gado de Corte (CNPGC) |
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| Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
26/06/2013 |
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Data da última atualização: |
07/11/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
Internacional - A |
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Autoria: |
MALHI, Y.; WOOD, D.; BAKER, T. R.; WRIGHT, J.; PHILLIPS, O. L.; COCHRANE, T.; MEIR, P.; CHAVE, J.; ALMEIDA, S.; ARROYO, L.; HIGUCHI, N.; KILLEEN, T. J.; LAURANCE, S. G.; LEWIS, S. L.; MONTEAGUDO, A.; NEILL, D. A.; VARGAS, P. N.; PITMAN, N. C. A.; QUESADA, C. A.; SALOMÃO, R.; SILVA, J. N. M.; LEZAMA, A. T.; TERBORGH, J.; MARTÍNEZ, R. V.; VINCETI, B. |
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Afiliação: |
YADVINDER MALHI, Oxford University Centre for the Environment/ University of Edinburgh; DANIEL WOOD, University of Edinburgh; TIMOTHY R. BAKER, University of Leeds; JAMES WRIGHT, University of Southampton; OLIVER L. PHILLIPS, University of Leeds; THOMAS COCHRANE, Agteca; PATRICK MEIR, University of Edinburgh; JEROME CHAVE, Laboratoire Evolution et Diversité Biologique, CNRS/UPS; SAMUEL ALMEIDA, MPEG; LUZMILLA ARROYO, Museo Noel Kempff Mercado; NIRO HIGUCHI, INPA; TIMOTHY J. KILLEEN, Center for Applied Biodiversity Science, Conservation International; SUSAN G. LAURANCE, Smithsonian Tropical Research Institute; SIMON L. LEWIS, University of Leeds; ABEL MONTEAGUDO, Universidad Nacional San Antonio Abad del Cusco / Jardin Botanico de Missouri; DAVID A. NEILL, Fundacion Jatun Sacha; PERCY NÚÑEZ VARGAS, Universidad Nacional San Antonio Abad del Cusco; NIGEL C. A. PITMAN, Duke University; CARLOS ALBERTO QUESADA, University of Leeds; RAFAEL SALOMÃO, MPEG; JOSÉ NATALINO MACEDO SILVA, CIFOR / CPATU; ARMANDO TORRES LEZAMA, INDEFOR; JOHN TERBORGH, Duke University; RODOLFO VÁSQUEZ MARTÍNEZ, Jardin Botanico de Missouri; BARBARA VINCETI, International Plant Genetic Resources Institute. |
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Título: |
The regional variation of aboveground live biomass in old-growth Amazonian forests. |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Global Change Biology, v. 12, n. 7, p. 1107-1138, July 2006. |
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DOI: |
10.1111/j.1365-2486.2006.01120.x |
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Idioma: |
Inglês |
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Conteúdo: |
The biomass of tropical forests plays an important role in the global carbon cycle, both as a dynamic reservoir of carbon, and as a source of carbon dioxide to the atmosphere in areas undergoing deforestation. However, the absolute magnitude and environmental determinants of tropical forest biomass are still poorly understood. Here, we present a new synthesis and interpolation of the basal area and aboveground live biomass of old-growth lowland tropical forests across South America, based on data from 227 forest plots, many previously unpublished. Forest biomass was analyzed in terms of two uncorrelated factors: basal area and mean wood density. Basal area is strongly affected by local landscape factors, but is relatively invariant at regional scale in moist tropical forests, and declines significantly at the dry periphery of the forest zone. Mean wood density is inversely correlated with forest dynamics, being lower in the dynamic forests of western Amazonia and high in the slow-growing forests of eastern Amazonia. The combination of these two factors results in biomass being highest in the moderately seasonal, slow growing forests of central Amazonia and the Guyanas (up to 350 Mg dry weight ha−1) and declining to 200?250 Mg dry weight ha−1 at the western, southern and eastern margins. Overall, we estimate the total aboveground live biomass of intact Amazonian rainforests (area 5.76 × 106 km2 in 2000) to be 93±23 Pg C, taking into account lianas and small trees. Including dead biomass and belowground biomass would increase this value by approximately 10% and 21%, respectively, but the spatial variation of these additional terms still needs to be quantified. MenosThe biomass of tropical forests plays an important role in the global carbon cycle, both as a dynamic reservoir of carbon, and as a source of carbon dioxide to the atmosphere in areas undergoing deforestation. However, the absolute magnitude and environmental determinants of tropical forest biomass are still poorly understood. Here, we present a new synthesis and interpolation of the basal area and aboveground live biomass of old-growth lowland tropical forests across South America, based on data from 227 forest plots, many previously unpublished. Forest biomass was analyzed in terms of two uncorrelated factors: basal area and mean wood density. Basal area is strongly affected by local landscape factors, but is relatively invariant at regional scale in moist tropical forests, and declines significantly at the dry periphery of the forest zone. Mean wood density is inversely correlated with forest dynamics, being lower in the dynamic forests of western Amazonia and high in the slow-growing forests of eastern Amazonia. The combination of these two factors results in biomass being highest in the moderately seasonal, slow growing forests of central Amazonia and the Guyanas (up to 350 Mg dry weight ha−1) and declining to 200?250 Mg dry weight ha−1 at the western, southern and eastern margins. Overall, we estimate the total aboveground live biomass of intact Amazonian rainforests (area 5.76 × 106 km2 in 2000) to be 93±23 Pg C, taking into account lianas and small trees.... Mostrar Tudo |
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Thesagro: |
Biomassa; Carbono; Fertilidade do Solo. |
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Thesaurus NAL: |
Amazonia. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02953naa a2200469 a 4500
001 1960662
005 2022-11-07
008 2006 bl uuuu u00u1 u #d
024 7 $a10.1111/j.1365-2486.2006.01120.x$2DOI
100 1 $aMALHI, Y.
245 $aThe regional variation of aboveground live biomass in old-growth Amazonian forests.$h[electronic resource]
260 $c2006
520 $aThe biomass of tropical forests plays an important role in the global carbon cycle, both as a dynamic reservoir of carbon, and as a source of carbon dioxide to the atmosphere in areas undergoing deforestation. However, the absolute magnitude and environmental determinants of tropical forest biomass are still poorly understood. Here, we present a new synthesis and interpolation of the basal area and aboveground live biomass of old-growth lowland tropical forests across South America, based on data from 227 forest plots, many previously unpublished. Forest biomass was analyzed in terms of two uncorrelated factors: basal area and mean wood density. Basal area is strongly affected by local landscape factors, but is relatively invariant at regional scale in moist tropical forests, and declines significantly at the dry periphery of the forest zone. Mean wood density is inversely correlated with forest dynamics, being lower in the dynamic forests of western Amazonia and high in the slow-growing forests of eastern Amazonia. The combination of these two factors results in biomass being highest in the moderately seasonal, slow growing forests of central Amazonia and the Guyanas (up to 350 Mg dry weight ha−1) and declining to 200?250 Mg dry weight ha−1 at the western, southern and eastern margins. Overall, we estimate the total aboveground live biomass of intact Amazonian rainforests (area 5.76 × 106 km2 in 2000) to be 93±23 Pg C, taking into account lianas and small trees. Including dead biomass and belowground biomass would increase this value by approximately 10% and 21%, respectively, but the spatial variation of these additional terms still needs to be quantified.
650 $aAmazonia
650 $aBiomassa
650 $aCarbono
650 $aFertilidade do Solo
700 1 $aWOOD, D.
700 1 $aBAKER, T. R.
700 1 $aWRIGHT, J.
700 1 $aPHILLIPS, O. L.
700 1 $aCOCHRANE, T.
700 1 $aMEIR, P.
700 1 $aCHAVE, J.
700 1 $aALMEIDA, S.
700 1 $aARROYO, L.
700 1 $aHIGUCHI, N.
700 1 $aKILLEEN, T. J.
700 1 $aLAURANCE, S. G.
700 1 $aLEWIS, S. L.
700 1 $aMONTEAGUDO, A.
700 1 $aNEILL, D. A.
700 1 $aVARGAS, P. N.
700 1 $aPITMAN, N. C. A.
700 1 $aQUESADA, C. A.
700 1 $aSALOMÃO, R.
700 1 $aSILVA, J. N. M.
700 1 $aLEZAMA, A. T.
700 1 $aTERBORGH, J.
700 1 $aMARTÍNEZ, R. V.
700 1 $aVINCETI, B.
773 $tGlobal Change Biology$gv. 12, n. 7, p. 1107-1138, July 2006.
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