Data/hora: 01/06/2024 13:59:50

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Botanical aspects of Heteropterys umbellata (Malpighiaceae): a cytological and palynological approach	
Autores: 	Sousa,Saulo M.; Reis,Aryane C.; Gomes,Shaiany S.L.; Bernardo,Karina B.; Salimena,Fátima R.G.; Viccini,Lyderson F.	
Data: 	2010-12-01	
Ano: 	2010	
Palavras-chave: 	Chromosome number; Heterochromatin pattern; Heteropterys umbellata; Malpighiaceae; Meiosis; Pollen viability.	
Resumo: 	The genus Heteropterys is one of the major genera in Malpighiaceae. However, few cytological and palynological studies were reported. The present work described for the first time the chromosome number, heterochromatin pattern, meiotic behavior, pollen viability and palynological aspects of Heteropterys ubellata, a very spread species. One large Brazilian population was evaluated using conventional techniques for meiotic studies and acetolyse to access the pollen morphology. The species showed 2n = 20 chromosomes, normal meiotic development and viable pollens. Great blocks of heterochromatin were observed around the centromers. DAPI staining was positive for centroeric heterochroatin, hile CMA3 ark as observed just at terinal regions of one pair of hoologues chromosomes. This result and the presence of one chromosome pair attached to the nucleoli during the pachytene and diakinesis suggested the presence of only one pair of NORs. Palynological analysis revealed that pollen grains are apolar, 6 porate and with colpoids associated to all pores. The pollen content was positive for the starch test, and the exine was rugulate with little psilate regions.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400009	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/S0001-37652010000400009	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.82 n.4 2010	
Fonte: 	info:eu-repo/semantics/openAccess