ACLIMATAÇÃO E FISIOLOGIA DE MUDAS DE GUANANDI CULTIVADAS EM TELAS DE SOMBREAMENTO FOTO-PROTETORAS

Abstract

The luminosity is the most important factor in the growth and development of seedlings. Plants can change their growth model and resource allocation in response to the light environment. Biometric, biochemical and physiological parameters of Guanandi seedlings grown in full sun and under 50% shade using photo-converter (blue, black and red) screens were evaluated and analyzed in the summer and fall of 2012 The seedlings grown in full sunlight showed higher quality, vigour and mass accumulation. The screens have changed the microclimate, causing changes in gas exchange and limiting the growth of seedlings. The activity of antioxidant enzymes showed that the treatments did not cause oxidative stress. Guanandi presented ample capacity for acclimation to shade and full sun. However performed better in full sun, even been considered late climax species.

Keywords

• biochemistry
• Calophyllum brasiliensis
• ecophysiology
• irradiance