Geoffroea

Abstract: Geoffroea striata M., commonly known as marizeiro in Brazil, is an important tree species, mainly because it is adapted to riparian forest conditions in semi-arid and associated ecosystems. The species occur in large areas of northeastern Brazil and in the Sao Francisco river valley, always restricted to seasonally flooded environments. This study aimed to evaluate the effect of different types of packaging and storage periods, as well the influence of environments on the process of seed germination and vigor of Geoffroea striata . The experiment was carried out at the Laboratory of Plant Ecology - CCA//UFPB, following a completely randomized design. The seeds were distributed among two environments (natural conditions in the laboratory and cold room), packed in two types of packaging (paper bags and plastic bags) for five periods of storage: 0; 15; 30; 60 and 90 days. Water content, the emergence velocity index, dry weight and length of seedlings were evaluated. The data were submitted to a polynomial regression analysis. In plastic packaging and the environment of the cold room there was less reduction of viability and vigor during storage. Seeds packed in paper bags and stored in a laboratory rapidly lost viability and vigor, after 30 days of storage.

Abstract: Two are the arboreal species of the genus Geoffroea that vegetate in Argentina: Geoffroea striata Morong (manduvi-ra) and Geoffroea decorticans Burkart (chanar). Both have floristic importance, are used locally but their woods have no commercial value. The objectives of this work are: to describe the wood and bark anatomy of Geoffroea striata and contribute to their knowledge, to compare it anatomically with Geoffroea decorticans. The material was collected from natural forests of Isla del Cerrito Locality in Chaco (Chaco eastern district) and Los Flores, in Santiago del Estero (Chaco western district). Five trees of each species were selected at random, obtaining a disc of 5 cm from the trunk at 1,3 m. In wood descriptions the IAWA Nomenclature was used. Bark descriptions were made according to standards of tissues distribution and the terminology of Roth. It may be Concluded that Geoffroea striata is a tree of great anatomical affinity with Geoffroea decorticans, being susceptible to have an alternative use of its wood. The variables present in the wood having meaningful differences are: vessel length, number of pores/mm 2 ; fiber external and internal diameter, fiber wall thickness, as well as ray length. In bark, the principal differences reside in the external aspect. Both species present evolutionary characters in wood and bark.