Publicação on-line; 43 ref.; 4 tables; 2 illus.; Summary (En)

ABSTRACT

The heterogeneous light pattern in forest environments leads to specific morphological and
physiological responses. However, anthropogenic pressures in areas such as Atlantic Forest and
Cerrado are modifying the light availability, and consequently the forest community composition.
The aim of this study was to investigate the plasticity of forest species Pimenta pseudocaryophyllus
under full sunlight and shade conditions. P. pseudocaryophyllus showed typical shade plant
phenotype, with higher net photosynthesis, transpiration, and chlorophyll a and b contents
when cultivated under this condition. The decrease in net photosynthesis under full sunlight
conditions is probably related to PSII photoinhibition. In addition, under full sunlight, reduced
height, number of leaves, and specific leaf area was observed, while plants in shade increased
these characteristics. P. pseudocaryophyllus did not show high morphological and physiological
plasticity, which may be a maladaptive response. It was concluded that forest disturbances could
compromise the occurrence and survival of P. pseudocaryophyllus.

Keywords: initial growth, RDPI, full sunlight, shade, pau-cravo.