Anatomia do Lenho de espécies da subfamília Ixoroideae (Rubiaceae) do Parque Estadual da Ilha Grande, Rio de Janeiro

Abstract

Anatomical studies of wood are often applied to the solution of taxonomic, phylogenetic and evolutionary questions as this fabric features a more conservative trend and therefore less plasticity. This work aims to study the anatomic structure of the log eight shrub-tree species subfamily Ixoroideae occurring in the State Park of Ilha Grande, Angra dos Reis, Rio de Janeiro, aiming to contribute subsidies to local species identification and taxonomy and phylogeny of subfamily Ixoroideae and Rubiaceae. The study was conducted in an important remnant of the Atlantic Forest in the state of Rio de Janeiro. The botanical material was collected by nondestructive methods, the samples were processed according to standard techniques in wood anatomy and analyzes and descriptions followed the recommendations of COPANT (1973) and IAWA Commitee (1989). The results show that the eight species have diagnostic qualitative characteristics that allow species secrete and build an identification key based on the presence or absence of inorganic inclusions disjunctive sheath cells and cell walls in the spokes and the type of axial parenchyma. The statistical analysis supported the grouping of the species in the subfamily Ixoroideae, it was not possible in the grouping level of the tribes to which these species are subject. The results also indicated the need for review of phylogenetic trees hypothetical proposals for Ixoroideae subfamily, based on the types of wood, mineral inclusions and axial parenchyma. It is worth noting that the results confirmed the importance of the anatomy of wood for identifying species difficult to identify in the Atlantic Forest remnants of the State of Rio de Janeiro, especially when devoid of reproductive material, which is important aspect for the management and management of native species of conservation area where this study was conducted