title: Cytological and histochemical gradients on two Copaifera langsdorffii Desf. (Fabaceae)--Cecidomyiidae gall systems.
abstract: Previous ultrastructural and histochemical analysis proposed patterns in the accumulation of substances in galls of Diptera: Cecidomyiidae in some plant species of the temperate region. Similar analyses were done to verify the conservativeness of these patterns in the Neotropical region, where a great number of species of Cecidomyiidae is responsible for a wide diversity of morphotypes. Two gall morphotypes induced by Cecidomyiidae in a unique host plant, Copaifera langsdorffii, were studied. The gradients of carbohydrates and the activity of invertases and acid phosphatases were similar, but the cytological gradients and distribution of proteins evidenced that the sites of the induction as well as the amount of neoformed tissues may be peculiar to each gall system. The production of lipids just in the secretory cavities either in the non-galled or galled tissues indicated a potentiality of the host plant which could not be manipulated by the galling insects. Further, the absence of nucleus in the nutritive tissue, an exclusive feature of the horn-shaped galls, indicates cell death attributed to the feeding habit of the galling herbivore.
authors.affiliation: Departamento de Botânica, Instituto de Ciências Biológicas (ICB), Universidade Federal de Minas Gerais, CEP: 31270-901, Belo Horizonte, Minas Gerais, Brazil. dcoufmg@yahoo.com.br
authors.forename: Denis Coelho
authors.initials: DC
authors.lastname: de Oliveira
authors.forename: Renê Gonçalves da Silva
authors.initials: RG
authors.lastname: Carneiro
authors.forename: Thiago Alves
authors.initials: TA
authors.lastname: Magalhães
authors.forename: Rosy Mary dos Santos
authors.initials: RM
authors.lastname: Isaias
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D004175:Diptera / Q000472:pathogenicity*; D004789:Enzyme Activation; D007887:Fabaceae / Q000033:anatomy & histology* / Q000166:cytology* / Q000378:metabolism / Q000469:parasitology; D060434:Herbivory; D058503:Mesophyll Cells / Q000378:metabolism / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D018515:Plant Leaves / Q000378:metabolism / Q000469:parasitology / Q000648:ultrastructure; D010941:Plant Tumors / Q000469:parasitology*; D043324:beta-Fructofuranosidase / Q000378:metabolism
chemical_list: D000135:Acid Phosphatase; D043324:beta-Fructofuranosidase