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1. Universidade do Estado da Bahia, Departamento de Educação, Programa de Pós-Graduação em Biodiversidade Vegetal, Rua da Gangorra, 503, CHESF, 48608-240 Paulo Afonso, BA, Brasil 2. Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Botânica, Programa de Pós-Graduação em Biologia Vegetal, Campus UFMG, Avenida Presidente Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brasil 3. Corresponding author: rosy@icb.ufmg.br ABSTRACT (Structural and histochemical profi le of Lopesia sp. Rübsaamen 1908 pinnula galls on Mimosa tenuifl ora (Willd.) Poir. in a Caatinga environment). Gall-inducing insects can change the anatomical pattern of host plant tissues by inducing peculiar gall morphotypes. In this study, the structural changes observed in Lopesia galls on Mimosa tenuifl ora resemble those found in other Cecidomyiidae, with two tissue compartments. Nevertheless, the parenchyma layers of the inner compartment, between the mechanical zone and the nutritive tissue, are peculiar. Gall development does not impair the synthesis of any compounds detected by histochemical tests on non-galled tissues of M. tenuifl ora. Lignin, polyphenols, alkaloids and terpenoids were detected in the outer compartment, suggesting their involvement in chemical defence of galls. Proteins, reducing sugars and lipids were detected both in outer and inner compartments, whereas nutritive tissue is rich in reducing sugar. This profi le is linked with the nutrition of the gall-inducing insect. The Caatinga environment does not seem to constrain the development of galls, but the thick periclinal cell wall and homogeneous parenchyma may contribute to the control of humidity and light radiation, thus favouring the survival of the gall-inducing insect.

Structural and histochemical profile of Lopesia sp. Rübsaamen 1908 pinnula galls on Mimosa tenuiflora (Willd.) Poir. in a Caatinga environment