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The infl uence of light on chloroplast density and formation of unlignifi ed parenchyma was determined in stems of Myriocarpa longipes and Urera glabriuscula, two woody pioneer species from the Mexican tropics, growing either under the shade or under sunny conditions. The goals of the present study were: (1) to quantify and characterize chloroplasts in this tissue and (2) to determine the infl uence of two light conditions in chloroplast number and unlignifi ed parenchyma formation. Sunshine increases the presence of chloroplasts and the area of unlignifi ed parenchyma in M. longipes stems, whereas in U. glabriuscula it occurs the opposite. Differences in the presence of some features in the pioneer species studied, such as the abundance of mucilaginous ducts (M. longipes), type of cystolith (U. glabriuscula), and the area occupied by the pith in stem cross sections, occur as a response to canopy gaps in this tropical forest.

The chloroplasts and unlignified parenchyma of two tropical pioneer forest tree species (Urticaceae).