Consulta: subjectFacets:"Tropical tree"
Registros recuperados: 5
Data/hora: 04/06/2024 01:26:31

Genetic structure and gene flow in Eugenia dysenterica DC in the Brazilian Cerrado utilizing SSR markers
Provedor de dados: 74
Autores: Zucchi,Maria Imaculada; Brondani,Rosana Pereira Vianello; Pinheiro,José Baldin; Chaves,Lázaro José; Coelho,Alexandre Siqueira Guedes; Vencovsky,Roland.
The ''cagaita tree'' (Eugenia dysenterica) is a plant found widespread in the Brazilian Cerrado. Its fruit is used for popular consumption and for industrial purposes. This study opens a new perspective for the generation of population genetic data and parameters estimates for devising sound collection and conservation procedures for Eugenia dysenterica. A battery of 356 primer pairs developed for Eucalyptus spp. was tested on the ''cagaita tree''. Only 10 primer pairs were found to be transferable between the two species. Using a polyacrilamide gel, an average of 10.4 alleles per locus was detected, in a sample of 116 individuals from 10 natural ''cagaita tree'' populations. Seven polymorphic loci allowed estimation of genetic parameters, including...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SSR; Myrtaceae; Cerrado; Tropical tree; Genetic diversity and transferability.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000400008

AFLP marker analysis revealing genetic structure of the tree Parapiptadenia rigida (Benth.) Brenan (Leguminosae-Mimosoideae) in the southern Brazilian Tropical Rainforest
Provedor de dados: 74
Autores: Souza,Laís Bérgamo de; Ruas,Eduardo A.; Rodrigues,Luana A.; Ruas,Claudete F.; Ruas,Paulo M.
Parapiptadenia rigida is a tropical early secondary succession tree characteristic of the Tropical Atlantic Rainforest. This species is of great ecological importance in the recovery of degraded areas. In this study we investigated the variability and population genetic structure of eight populations of P. rigida. Five AFLP primer combinations were used in a sample of 159 individuals representing these eight populations, rendering a total of 126 polymorphic fragments. The averages of percentage of polymorphic loci, gene diversity, and Shannon index were 60.45%, 0.217, and 0.322, respectively. A significant correlation between the population genetic variability and the population sizes was observed. The genetic variability within populations (72.20%) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical tree; Genetic diversity; Population genetics; Conservation; AFLP.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400012

Methods of overcoming dormancy in Schizolobium amazonicum Huber ex Ducke (Leguminosae - Caesalpinioideae) seeds
Provedor de dados: 95
Autores: Cruz,Eniel David; Carvalho,José Edmar Urano de.
Seed dormancy is a frequent phenomenon in tropical species, causing slow and non-uniform germination. To overcome this, treatments such as scarification on abrasive surface and hot water are efficient. The objective of this study was to quantify seed germination with no treatment (Experiment 1) and identify an efficient method of breaking dormancy in Schizolobium amazonicum Huber ex Ducke seeds (Experiment 2). The effects of manual scarification on electric emery, water at 80ºC and 100ºC and manual scarification on wood sandpaper were studied. Seeds were sown either immediately after scarification or after immersion in water for 24h in a sand and sawdust mixture. Germination and hard seed percentages and germination speed were recorded and analyzed in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical tree; Germination; Germination speed; Hard seeds; Dead seeds.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222006000300016

Demography and structures population of Actinostemon concolor (Spreng.) Müll. Arg. (Euphorbiaceae) in flooded areas in Southern Brazil
Provedor de dados: 52
Autores: Bianchini,Edmilson; Araújo,Carla Gomes de; Green,Márcia; Pimenta,José Antonio.
The aim of this work was to analyze the size and spatial structures and demography of Actinostemon concolor (Spreng.) Müll. Arg. (Euphorbiaceae) in the flooded areas of Mata dos Godoy State Park. Fifty plots of 100 m² were established and three surveys were conducted. All the individuals were measured, mapped and divided into categories as seedlings, juveniles and adults. The coefficient of skewness, L-function of Ripley, and the matrix population models were used in the study. The population showed positive coefficient of skewness and the individuals were distributed in groups. The population growth rates (λ) were equal or lower than 1.0 and the adult survival and recruitment of juvenile to adult were the vital rates that most affected the values of λ....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elasticity; Matrix models; Spatial distribution; Structure size; Tropical tree.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000100009

Light as an indicator of ecological succession in brazilwood (Caesalpinia echinata Lam.)
Provedor de dados: 61
Autores: Mengarda,Liana H. G.; Souza,Rogério L. F. de; Campostrini,Eliemar; Reis,Fabrício O.; Vendrame,Wagner A.; Cuzzuol,Geraldo R. F.
The ecophysiological behavior of brazilwood (Caesalpinia echinata Lam.) plants was evaluated as affected by light quantity and quality. Nine-month-old plants were cultivated under 0%, 50%, and 80% artificial shading, and natural shading imposed by a closed canopy for a period of 392 days. At the end of that period growth parameters were measured, including relative growth rate (RGR), net assimilation rate (NAR), leaf area ratio (LAR), specific leaf mass (SLM) and root:shoot ratio (R:S). Higher leaf area, dry mass and RGR were obtained under 50% artificial shade. Under full sunlight (0% shade), growth was satisfactory showing higher R:S and SLM. Growth was inhibited under 80% artificial and natural shading indicating that C. echinata is not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorophyll fluorescence; Gas exchange; Growth; Light stress; Shade; Tropical tree.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100007