Data/hora: 16/06/2024 17:42:16

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 15/09/2009
Data da última atualização: | 15/09/2009
Autoria: | NUNES, J. D.; TORRES, G. A.; DAVIDE, L. C.; CAMPOS, J. M. S. de.
Título: | Chromosome banding and DNA content in tropical Pinus species.
Ano de publicação: | 2009
Fonte/Imprenta: | Rodriguesia, Piracicaba, v. 37, n. 82, p. 213-218, 2009.
Idioma: | Inglês

Conteúdo:

The species Pinus tecunumanii Eguiluz & J. P. Perry has been the reason for a taxonomic controversy for
more than 50 years. Some authors considered Pinus tecunumanii as a subspecies of Pinus patula, whereas
others stated it is a distinct species closer to Pinus oocarpa. In the present work, the tropical species Pinus
oocarpa Schiede ex Schltdl., Pinus patula Schltdl. & Cham, and Pinus tecunumanii Eguiluz & J.P. Perry
were evaluated as to chromosome banding pattern using CMA3 fluorochrome, to identify chromosome polymorphisms,
and as to nuclear DNA content using flow cytometry, to contribute to the differentiation among
the three taxa. Analysis of variance and Tukey´s test were used to verify the existence of a significative
difference for nuclear DNA content. The obtained CMA3 banding pattern evidenced that secondary constrictions
are GC-rich regions and that Pinus tecunumanii is closer to Pinus oocarpa than to Pinus patula.
Content of nuclear DNA means were significantly different, with the major mean being observed in Pinus
patula (43.36 pg), and the minor one in Pinus tecunumanii, provenance Mountain Pine Ridge (40.48 pg).
The intraspecific DNA content variation observed among four different provenances of Pinus tecunumanii
was not correlated to their latitudinal origin. The DNA content variation did not allow distinction between
Pinus tecunumanii and the remaining two species.

Palavras-Chave: | CMA banding; Nuclear DNA content.
Thesaurus Nal: | Pinus tecunumanii.
Categoria do assunto: | K Ciência Florestal e Produtos de Origem Vegetal
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (45849-1) - ADD - AP - PP -  -  -  - DIS