Resumo

TORRES RODRIGUEZ, GERARDO ANDRÉS  e  MURCIA VELASCO, JAIRO A. MORPHOLOGIC, HISTOLOGIC AND ULTRASTRUCTURAL STUDY OF THE NODULATION OF Frankia-Morella pubescens H. y B. ex Willdenow, (Myricaceae)"in situ". Rev.Bio.Agro [online]. 2008, vol.6, n.2, pp.21-27. ISSN 1692-3561.

Morella pubescens H. y B. ex Willdenow is a plant that carries out a symbiosis with an actinomicet of the species Frankia over the radical tissue of certain plants, which makes it known as actinorrize, of which 270 species are found and by which dinitrogen, contained in an unavailable form in the atmosphere can be fixed symbiotically to organic nitrogen: nitrates and ammonia. The work has as its objective to characterize the structures and infective process in the symbiotic association of Frankia sp in the roots of Morella pubescens. The nodes were collected, their external morphology was described and they were processed for high resolution optic Microscopy, Electronic Transmission and tinctures of histo-chemistry. The results showed a very organized infection pattern and structures typical of invasion by Frankia sp in the radical tissue of the plant, clearly observed in the ultra structure of the hiphas and fixed vesiculars of nitrogen

Palavras-chave : Actinorhizal plants; ultrastructure; symbiosis; actinomycete.

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