Barth e a ilha da Trindade, 1957-1959

Duarte, Regina Horta; Horta, Güydo Campos Machado Marques

doi:10.1590/s0104-59702012000300010

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…and goats (Capra sp. ) in 1700 by the astronomer Edmond Halley (Copeland, 1882;Alves, 1998;Duarte and Horta, 2012). It is believed that soon after their introduction, pigs became voracious predators of green turtle eggs deposited in nests along the beaches of Trindade (Barth, 1958).…”

Section: Introductionmentioning

confidence: 99%

Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Pereira

Martins

Seminoff

et al. 2023

Marine Environmental Research

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Section: Introductionmentioning

confidence: 99%

Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Pereira

Martins

Seminoff

et al. 2023

Marine Environmental Research

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“…As plantas de G. bonduc possuem caules, galhos e folhas cobertos de espinhos e formam raízes laterais extensas (Francis, 2000). (Duarte & Horta, 2012). As profundidades oceânicas ao redor da ilha atingem 5800 m, e a parte emersa da ilha atinge 620 m (Alves, 1998 Existem variações nas metodologias utilizadas para analisar exsudatos.…”

Section: Exsudação Radicularunclassified

Atividade fitotóxica de extratos e exsudatos radiculares de Guilandina bonduc (Fabaceae)

Petry¹

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Palavras chave: Guilandina bonduc, Fitotoxicidade, exsudados radiculares, Caesaldekarin C 15 ABSTRACTPlants emit a variety of secondary metabolites, that can influence negative or positively on the growth and development of neighbor species. Such phenomenon is called allelopathy. One of the mechanismes for emission of allelochemicals is through root exudate. It has been noticed that there are halos of bare soil around Guilandina bonduc ( Fabaceae) and its roots reach a population of Cyperus atlanticus, a endemic specie of the Trindade Island, that are suffering with G. bonduc expansion. Therefore, this work aimed to investigate phytotoxic activity of compounds in the root tissue and in the exudate of G. bonduc root and to identify compounds in this interaction. Root exudate of G. bonduc were obtained in hydroponic mean, and roots collected in the field (Trindade Island) provided aqueous and methanol extracts. Biological activity of the extracts were tested considering the initial growth of Lactuca sativa and Raphanus sativus grown in petri dishes in the concentrations of 125, 250, 500, 1000 and 2000ppm of extracts. Activity of root exudate randomly collected was also tested against the same species as above. It was also estimated the concentration of exudates in the field. Activity of aqueous extract, at the same concentrations mentioned previously, was also investigated using soil collected in the field, at Trindade Insland, with and without microorganisms. It was isolated one product from methanolic extract, identified using NMR, and its activity was tested at the concentrations of 10, 30, 100, 300 and 1000µM. There was a negative correlation between root exudates production in the laboratory and plant total weight. Estimated concentration of exudate in the field was similar to the ones used in the laboratory bioassays. Root exudate and aqueous extract stimulated growth of tested species. On the other hand, methanolic extract inhibited initial growth of the same species, especially in the roots. Aqueous and methanolic extracts together with root exudate revealed different chromatographic profiles; showing that each was quantitatively and qualitatively different. Results of bioassay of aqueous extract in the soil were different to the one in petri dishes -there was no significant difference in the growth of tested species. The isolated product from methanolic extract is a cassane furanoditerpene, known as Caesaldekarin C. It showed phytotoxic activity similar to total extract, however lower, suggesting a synergistic effect.Key-words: Guilandina bonduc, phitotoxicity, root exudates, Caesaldekarin C 16 1. Introdução Metabolismo secundárioO conjunto de reações químicas que ocorrem nos organismos vivos é conhecido como metabolismo, que trabalha prioritariamente em processos que sintetizem substâncias orgânicas, essenciais à sua sobrevivência e reprodução, como carboidratos, proteínas, gorduras e ácidos nucleicos, sendo estes pertencentes ao metabolismo primário. Esses metabólitos têm reconhecidas funções nos proces...

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“…O clima é do tipo oceânico tropical com temperatura média anual de 25,2ºC. A Ilha é resultado da atividade vulcânica da zona abissal do atlântico há cerca de três milhões de anos e faz parte de uma grande cadeia vulcânica submarina chamada lineamento Vitória-Trindade Almeida 2000;Duarte et al 2012 .…”

Section: Introductionunclassified

O gênero Peperomia da Ilha da Trindade : um caso de isolamento?

Dantas¹

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AgradecimentosA minha família e aos amigos, que não estão envolvidos com o meio científico, mas que me apoiam e incentivam em todos os momentos.A minha orientadora e amiga Micheline, pela paciência, dedicação, apoio e incentivo, sem ela não seria possível estar aqui hoje.Ao professor e amigo Paulo, pelo apoio, oportunidades e pela presença durante o desenvolvimento deste estudo.A todos os amigos da UnB e do laboratório por todos os momentos de alegria e pela ajuda de sempre.À Josemília e à Marina pelo auxílio com os empréstimos.À Marinha do Brasil pelo apoio logísico, aos tripulantes do "NaPaOc Amazonas" e aos militares que guarnecem a Ilha da Trindade. ................................................................................44 CONCLUSÃO................................................................................................................46 ANEXOS.................................................................................................................... ABSTRACTPeperomia is one of the largest genera of basal angiosperms with about 1,600 species

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Barth e a ilha da Trindade, 1957-1959

Cited by 10 publications

References 5 publications

Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Long-term changes in body size of green turtles nesting on Trindade Island, Brazil: Signs of recovery?

Atividade fitotóxica de extratos e exsudatos radiculares de Guilandina bonduc (Fabaceae)

O gênero Peperomia da Ilha da Trindade : um caso de isolamento?

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