Anatophysiology of Vouacapoua americana Aubl. in the juvenile phase: A species included in the IUCN red list of threatened species

Abstract

The Amazon is undergoing environmental changes that can cause morphological and physiological changes in plants. The general objective of this study was to evaluate the anatomical and eco-physiological features of Vouacapoua americana during development in the Brazilian Amazon. It was observed that the stomata only occur in the abaxial face. Secretory structures are present throughout the leaf blade. In the central vein and petiole region it was observed that the xylem occupies the vein’s central part, presenting an arc shape. The eco-physiological evaluations revealed that the dry period presented higher values of leaf temperature and steam pressure deficit, and lower values of leaf humidity, stomatal conductance, and transpiration. Anatomical and physiological differences occur at each stage of development.