INFLUÊNCIA DE DIFERENTES INTENSIDADES LUMINOSAS NA MODULAÇÃO DA FISIOLOGIA DE Dipteryx alata Vogel E Myracrodruon urundeuva M. Allemão.

Abstract

The Cerrado is one of the largest phytogeographic domains of Brazil, however, the Cerrado vegetation cover has been reduced due to anthropic action. Another risk factor for this domain is climate change, which also represents a high risk to the biodiversity of this domain, since changes in climate characteristics, such as increased sunlight and consequent temperature increase, can considerably affect the metabolism of plant species and consequently the organisms that depend on them. To minimize this effect, one of the main recommended activities is the reforestation of degraded areas. Among the species that occur in this domain are Myracrodruon urundeuva Allemão and Dipteryx alata Vogel, species of great ecological relevance and of great interest for reforestation activities because of the need for conservation and their characteristics. M. urundeuva is classified as early to late secondary with pioneer behavior and demanding light, while D. alata is classified as early to late secondary, therefore with better initial development in shade. In this study we verified how these species develop in different light regimes in order to verify the influence of different light levels on the morphophysiological responses of these species. For this, seedlings of M. urundeuva and D. alata were subjected to three different levels of shading, namely 100%, 30% and 10% of light during five months. After the acclimation period, morphological, anatomical and physiological parameters were evaluated. It was possible to observe that both species have different development strategies in relation to light regimes. The species M. urundeuva presented itself as a more plastic species to light levels, expressing greater responses at high light levels. The species D. alata expressed few physiological responses in relation to light regimes, showing better development in shadows.