Origem e formação das domácias em Coffea L.

Abstract

The controversial problem of the domaceae origin is focalized in this paper. In reviewing the literature, we confined ourselves to the bibliography dealing only with the subject under consideration. Looking carefully into the problem of their origin, two hypothesis have been poposed to explain the domaceae formation. 1.°) caused by insects or mites (LUNDSTRÖEM et al). 2.°) hereditary character (CHEVALIER). Both hypothesis were examined toward the enlightenment of this problem and we have concluded, with CHEVALIER, to be an hereditary character. We worked with coffee seeds and coffee tree branches bearing leaves at varying ages from the live collections belonging to the Instituto Agronômico de Campinas. The preliminary morphological observations were made with a stereoscopic microscope. The anatomic structures were studied through transversal (cross-section) and longitudinal (lenghtwise) 18 micra cuttings (cuts), dyed with crystal-violet and erythrosine.