Data/hora: 10/06/2024 12:23:11

Provedor de dados: 	Naturalis Digital Academic Repository	
País: 	Netherlands	
Título: 	Wood anatomy of  Rauvolfioideae (Apocynaceae): a search for meaningful non-DNA characters at the tribal level	
Autores: 	Lens, F.; Endress, M.E.; Baas, P.; Jansen, S.; Smets, E.	
Data: 	2008	
Ano: 	2008	
Palavras-chave: 	Apocynaceae; APSA clade; Climbing vs. nonclimbing habit; Rauvolfi oideae; Systematic wood anatomy; Tribal classification; 42.58.	
Resumo: 	Wood anatomical studies in the economically important Apocynaceae or dogbane family are fragmentary. This study represents a first attempt to unravel the phylogenetic signifi cance and major evolutionary trends in the wood of the family, using existing and new microscopic wood observations within the large subfamily Rauvolfi oideae. On the basis of LM and SEM observations of 91 species representing all 10 currently recognized tribes, we found that most of the tribes are characterized by a unique combination of wood characters, such as vessel grouping, vessel element length, fi ber type, frequency of uniseriate rays, and fused multiseriate rays. Climbing rauvolfi oid taxa can generally be distinguished from erect species by their wider vessels, tendency to form paratracheal axial parenchyma, presence of tracheids, and occurrence of laticifers in rays. With respect to the entire family, there is a general phylogenetic trend toward shorter vessel elements, a higher proportion of vessels in multiples and more vessels per multiple, higher tracheid abundance, more paratracheal parenchyma, and fewer cells per axial parenchyma strand in the more derived Apocynaceae. Most of these evolutionary trends are likely to be triggered by drier environmental conditions and/or shifts from an erect to a climbing habit.	
Tipo: 	Article / Letter to the editor	
Identificador: 	http://www.repository.naturalis.nl/record/424647

http://dare.uva.nl/cgi/arno/show.cgi?fid=450361

http://dare.uva.nl/cgi/arno/show.cgi?fid=450362

http://dare.uva.nl/cgi/arno/show.cgi?fid=450363	
Formato: 	application/pdf	
Fonte: 	Various articles (1537-2197) vol.95 (2008) nr.10 p.1199	
Fonte: 	(c) Naturalis