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Biosystematics of the genus Dahlstedtia Malme (Leguminosae, Papilionoideae, Millettieae) Rev. Bras. Bot.
Teixeira,Simone P.; Ranga,Neusa T..
Dahlstedtia has been considered a monotypic genus by some authors, but comprising two species according to others. The latter view was supported by our biosystematic study. The two species are Neotropical, mainly occurring in the Brazilian Atlantic Forest, where they are, however, allopatric. Experimental pollinations show that the two species are intersterile. After interspecificcrossings, few pollen tubes reach the ovule, a dense secretion fills the micropyle and no proembryos are formed. Probably, there is no gene flow between species, but if it should occur, no hybrids would be formed. The present work confirms Burkart's taxonomic view, according to which Dahlstedtia comprises at least two species: D. pinnata and D. pentaphylla.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allopatry; Dahlstedtia pentaphylla; Dahlstedtia pinnata; Gene flow; Geographical distribution.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042004000100005
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Components of fecundity and abortion in a tropical tree, Dahlstedtia pentaphylla (Leguminosae) BABT
Teixeira,Simone de Pádua; Pereira,Rodrigo Augusto Santinelo; Ranga,Neusa Taroda.
Studies were conducted on pollination and patterns of fruit and seed production to assess the potential factors causing high fruit and seed abortion in Dahlstedtia pentaphylla (Leguminosae) through analyses of relationships between flower position in the inflorescence and ovules and seeds within ovaries and fruits, and flower, fruit and seed abortion. No differences were found in pollination and fruit set as a function of inflorescence position. There was no relationship, neither between degenerating ovules and their position within the ovary, nor between developing seed and fruit position. Maternal resource limitation related to fruits and embryos, due to the high cost of fruit production and seed maturation, was one of the factors that led to a high...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abortion; Atlantic Rainforest; Dahlstedtia pentaphylla; Leguminosae; Reproduction.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000700007
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Prenylated flavonoids as evolutionary indicators in the genus Dahlstedtia. Repositório Alice
GARCEZ, F. R.; SCRAMIN, S.; NASCIMENTO, M. C. de; MORS, W. B..
Abstract: Three chalcones, two beta-hydroxychalcones, four flavanones, six flavones, four flavonols, one rotenoid and one pterocarpan were isolated from the roots of Dahlstedtia pinnata and D. pentaphylla. With the exception of the pterocarpan, all the compounds exhibit prenylation in the A ring, a characteristic of flavonoids produced by species of the Tephrosieae. Of the 21 flavonoids identified, five (2 flavanones and 3 flavones) are new as naturally occurring compounds. A neat distinction in the biosynthetic capability of the two species, leading to the production of flavanones and flavonols in D. pentaphylla, but not in D. pinnata, is observed. In this latter species, biosynthesis is totally oriented toward dehydrogenation, producing flavones. By both...
Tipo: Artigo de periódico Palavras-chave: Dahlstedtia pinnata; Dahlstedtia pentaphylla; Substance; Flavonoid.
Ano: 1988 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/10582
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Taxonomic value of foliar characters in Dahlstedtia Malme: Leguminosae, Papilionoideae, Millettieae Acta Botanica
Teixeira,Simone de Pádua; Gabrielli,Antonio Carlos.
Dahlstedtia Malme (Leguminosae) is a neotropical genus, native to the Brazilian Atlantic Forest, and comprises two species, D. pinnata (Benth.) Malme and D. pentaphylla (Taub.) Burk., although it has been considered a monotypic genus by some authors. Leaf anatomy was compared to verify the presence of anatomical characters to help delimit species. Foliar primordium, leaflet, petiolule, petiole and pulvinus were collected from cultivated plants (Campinas, SP, Brazil) and from natural populations (Picinguaba, Ubatuba and Caraguatatuba, SP, Brazil - D. pinnata; Antonina, PR, Brazil - D. pentaphylla). Studies on leaflet surface assessment (Scanning Electron Microscopy), as well as histology and venation analyses were carried out of dehydrated, fresh and fixed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cambial activity; Dahlstedtia pinnata; Dahlstedtia pentaphylla; Paraveinal mesophyll; Secretory cavity.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062006000200014
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