Variability of the chromosomal number and meiotic behavior in populations ofBidens pilosaL. (Asteraceae) from southern Brazil

Autor:	Juliana M. Fachinetto, Acf Silva, Haywood Dail Laughinghouse, Solange Bosio Tedesco
Rok vydání:	2008
Předmět:	biology Pilosa Aneuploidy Polyploid complex Asteraceae medicine.disease biology.organism_classification medicine.disease_cause chemistry.chemical_compound Meiosis chemistry Pollen Botany Bidens pilosa Genetics medicine General Agricultural and Biological Sciences Orcein
Zdroj:	Caryologia. 61:164-169
ISSN:	2165-5391 0008-7114
DOI:	10.1080/00087114.2008.10589625
Popis:	Bidens pilosa is a medicinal species from the Asteraceae family, with a wide geographical distribution, found all over Brazil. There are no reports on chromosomal studies from the Brazilian South. Mitotic chromosomes, meiotic behavior, and pollen viability were studied in 6 populations of B. pilosa from Rio Grande do Sul State, Brazil, using conventional staining with acetic orcein 2%. The populations include cytotypes with a variable number of chromosomes: 2n=36, 2n=48 and 2n=54, indicating polyploidy and aneuploidy. The meiotic process was considered regular, even though irregular chromosomal pairing appeared, which is normal in cytotypes from a polyploid complex. The irregularities observed were mainly on univalent, trivalent, and tetravalent pairing associations. However, the pollen viability estimative was high.
Databáze:	OpenAIRE
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