Consulta: creatorFacets:"Varanda,Elenice Mouro"
Registros recuperados: 4
Data/hora: 12/06/2024 11:15:29

Variation in plant defenses of Didymopanax vinosum (Cham. &amp;amp; Schltdl.) Seem. (Apiaceae) across a vegetation gradient in a Brazilian cerrado
Provedor de dados: 39
Autores: Pais,Mara Patrícia; Varanda,Elenice Mouro.
Cerrado vegetation is composed of a mosaic of vegetation types, from campo sujo, dominated by herbs; campo cerrado and cerrado sensu stricto, with shrubby vegetation; to cerradão, with trees forming a denser forest. This physiognomic mosaic is related to differences in the water availability in the soil. Cerrado plants are considered physically and chemically well defended against herbivores, but there are no studies showing how plants allocate investment to various types of defensive mechanisms in different habitat physiognomies. The defensive mechanisms and the nutritional traits of a cerrado plant, Didymopanax vinosum (Cham. &amp;amp; Schltdl.) Seem. (Apiaceae), were compared along a vegetation gradient. Toughness, as well as water, nitrogen, cellulose,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Plant defenses; Tannins; Vegetation gradient; Water stress.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000300007

Ceras foliares epicuticulares de espécies congêneres da mata e do cerrado
Provedor de dados: 39
Autores: Varanda,Elenice Mouro; Santos,Déborah Yara Alves Cursino dos.
Espécies de cerrado e mata foram analisadas quanto à sua composição em ceras foliares epicuticulares e de seus componentes hidrocarbonetos. Observou-se nas espécies de cerrado uma tendência a teores de ceras pouco maiores que os de espécies de mata estacionai semidecídua. A porcentagem de hidrocarbonetos nas ceras foi maior na maioria das espécies de mata que nas espécies congêneres de cerrado. Pela análise em CG, os hidrocarbonetos mostraram predominância de C29 e C31 apresentando um comprimento médio da cadeia de carbono dos homólogos menos variável em espécies de mata, em torno de 30,5, que de cerrado nas quais este valor variou de 28,5 a 31,3. Os resultados são discutidos em relação ao provável papel ecológico das ceras e sua aplicação como marcadores...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ceras epicuticulares; Cerrado; Floresta semidecídua; Alcanos; Ecologia.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33061996000100005

Weather, cultivar and density-dependent processes influence on aphid in alfalfa
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Rassini,Joaquim Bartolomeu.
It is important to understand the effects of weather, insect density and plant cultivar on insect abundance to predict and prevent crop production loss. The present work investigated the influence of such factors on aphid in alfalfa during one year (short term). Data was collected from September/1997 to August/1998 at Canchin Farm (CCPSE-EMBRAPA), São Carlos, State of São Paulo, Brazil. Weather conditions had, in general, little effect on the variation of aphid populations, but Therioaphis maculata abundance was negatively correlated to humidity. Moreover, high maximum temperatures and low levels of rainfall possible favored T. maculata high abundance on Crioula and P3 cultivars. Therefore, appropriate management of this species is required during hot and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbivory; Hemiptera; Medicago sativa; Resistance; Population dynamics.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052007000200012

Effect of the inherent variation in the mineral concentration of alfalfa cultivars on aphid populations
Provedor de dados: 53
Autores: Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Primavesi,Ana Cândida.
Plants have inherent variability of mineral content which affects their physiology and consequently the herbivorous insects feeding on them. Besides, insects need considerable amounts of potassium, phosphorus and magnesium in their diets, whereas little calcium, sodium and chloride are required. In this study, the inherent variation on mineral (Ca, S, Mg, N, P, K and also C:N ratio) concentrations and aphid (Acyrthosiphon spp., Therioaphis maculata, Aphis craccivora) populations on three alfalfa (Medicago sativa) cultivars (P3; Crioula, the most widely cultivated in Brazil, and CUF 101, an aphid-resistant) were studied between September/1997 and August/1998. A significant variation on mineral concentrations and aphid populations was observed among...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aphididae; Insecta; Nutrients; Resistance; Plant-insect relation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052005000200010