Data/hora: 16/06/2024 19:14:38

Provedor de dados: 	74	
País: 	Brazil	
Título: 	Karyotype morphology and evolution in some Lathyrus (Fabaceae) species of southern Brazil	
Autores: 	Klamt,Adriane; Schifino-Wittmann,Maria Teresa.	
Data: 	2000-06-01	
Ano: 	2000	
Resumo: 	The karyotypes of Lathyrus nervosus Lam., L. pubescens Hook. et Arn., L. paranensis Burk. and L. crassipes Gill ap. Hook et Arn., native to Rio Grande do Sul (southern Brazil), are described in detail for the first time. All taxa have 2n = 14 chromosomes. The karyotypic formulae were 2 m + 12 sm for L. nervosus, L. pubescens and L. paranensis and 4 m + 10 sm for L. crassipes. In all species, the smallest chromosome pair bore a secondary constriction with a satellite in the long arm. Intraspecific variability in the position and number of secondary constrictions was observed in L. nervosus and L. pubescens. All of the species had a conservative and similar karyotype morphology, but differed in total complement size by as much as 20% between the highest (L. nervosus) and lowest (L. crassipes) values. These results suggest that changes in chromosome size during evolution have been similar for all the chromosomes of the complement. Together with data on the life cycle and mode of reproduction, these results also indicate that L. crassipes is a derived taxon, if an evolutionary trend towards a decrease in chromosome size is accepted.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572000000200036	
Editor: 	Sociedade Brasileira de Genética	
Relação: 	10.1590/S1415-47572000000200036	
Formato: 	text/html	
Fonte: 	Genetics and Molecular Biology  v.23 n.2 2000	
Fonte: 	info:eu-repo/semantics/openAccess