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| Gonçalves,José F.C.; Santos Jr.,Ulysses M.; Nina Jr.,Adamir R.; Chevreuil,Larissa R.. |
| Plant adaptation under conditions of limited irradiance can be investigated by their efficiency while using the available energy with a minimal thermodynamic energy loss. For this reason, we compared the energetic fluxes and the performance index (PI ABS) in copaiba (Copaifera multijuga) and mahogany (Swietenia macrophyla) seedlings under both sunlight and shade. The experiment was carried out in Manaus (3º8'S, 59º52'W), Amazonas State, Brazil. The fluorescence transients were obtained in intact and healthy leaves using a Plant Efficiency Analyser (PEA) between 1200 h and 1300 h. Using the O-J-I-P test, the following parameters were calculated: 1) density of reaction centers per cross section (RC/CS), 2) maximum quantum yield for primary photochemistry of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll a fluorescence; Energy fluxes in photosystem II; Light acclimation; O-J-I-P transients; Tropical tree species. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000300001 |
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| Batista, Camila Moreira; Freitas, Miguel Luiz Menezes; Moraes, Marcela Aparecida de; Zanatto, Antonio Carlos Scatena; Santos, Pedro César dos; Zanata, Marcelo; Moraes, Mario Luiz Teixeira de; Sebbenn, Alexandre Magno. |
| The present study aimed at estimating genetic parameters and variability among and within provenances for silvicultural traits of Handroanthus vellosoi (Toledo) Mattos, in provenances and progenies test stands, located at the Luiz Antônio Experimental Station (São Paulo State, Brazil). The test was established in the compact family block design, with two provenances (allocated in the plots), six replicates and sub-linear plots of five plants, totalizing 35 progenies. Diameter at breast height (DBH), plant height, cylindrical volume, stem form and survival at 24 years of age were evaluated. Significant differences among the provenances were observed only to the trait stem form. The analysis of deviance showed significant differences among progenies for the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ex situ conservation; Tropical tree species; Population genetics; Quantitative genetics Recursos genéticos florestais; Conservação genética; Genética de populações; Genética quantitativa; Melhoramento genético florestal Conservação ex situ; Espécies arbóreas tropicais; Genética de populações; Genética quantitativa. |
| Ano: 2012 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/358 |
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| Pisicchio, Cristina Moreira; Programa de Pós-Graduação em Ciências Biológicas, Universidade Estadual de Londrina, Paraná; Bianchini, Edmilson; UEL; Pimenta, José Antonio; UEL; Sert, Maria Aparecida; UEM; Davanso-Fabro, Viviane Maria; UEL; Medri, Moacyr Eurípedes; UEL. |
| (Heliocarpus popayanensis Kunth (Malvaceae) tolera a hipoxia do substrato?) A espécie Heliocarpus popayanensis é muito utilizada em recomposição florística de áreas degradadas, cujo solo pode apresentar hipoxia. Considerando esses aspectos, este trabalho visou avaliar resposta desta espécie ao alagamento. Indivíduos com 70 dias foram submetidos a substrato drenado(D) e alagado (A) por 30 e 60 dias e a alagado, 30 dias, e a drenado mais 30 dias (A/D). Foram determinados os comprimentos da raiz principal e do caule, a área foliar e o número de folhas, a biomassa e a taxa de crescimento relativo (TCR) de raízes, caules e folhas e o conteúdo nutricional das folhas. Até 60 dias de alagamento houve redução percentual média na biomassa (38%), na TCR (77%) e área... |
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Palavras-chave: 2.03.00.00-0 Anatomia; Espécie arbórea tropical; Conteúdo de nutrientes; Morfologia Botânica Anatomy; Tropical tree species; Content of nutrients; Morphology. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/3566 |
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| Souza,Rogéria P.; Válio,Ivany F.M.. |
| Growth of seedlings of fifteen tropical tree species representative, at the adult stage, of different successional positions, was studied under field conditions. Seedlings were grown in three treatments: full sun (FS), artificial shade imposed by neutral screens (AS) and natural shade imposed by a closed canopy in a Forest Reserve in Southeast Brazil (NS). Most of the studied species survived in both shade treatments, although their growth was severely affected. Decreases in height, internode numbers, dry weight, leaf area, root:shoot ratio (R:S) and increases in leaf mass ratio (LMR), leaf area ratio (LAR) and specific leaf area (SLA) were common responses to shade. Relative growth rates (RGRs) and net assimilation rates (NARs) were consistently lower in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seedling growth; Shade; Shade tolerance; Successional species; Tropical tree species. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000100005 |
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