Caracterização biomorfológica e germinação de sementes de Allamanda blanchetti em função da luz, temperatura e água

Abstract

The present study aimed to morphologically characterize the seeds of Allamanda blanchetti Lam. and to evaluate their germination responses under different environmental conditions. A total of 800 seeds were analyzed for length, width, thickness and weight. Germination was assessed under varying temperatures, water volumes, light conditions, and water stress simulated by PEG 6000. Considerable variability was observed in seed dimensions, with thickness being the most heterogeneous trait. Germination was most efficient at alternating temperatures of 20–30 °C, while high temperatures (>35°C) significantly reduced germination performance. Water volume and light conditions did not significantly affect germination, indicating the species’ adaptability to different moisture and light environments. Under water stress simulated by PEG 6000, germination was partially maintained up to -0.6 MPa, but was severely compromised at more negative potentials. These results indicate that Allamanda blanchetti produces highly viable and adaptable seeds, with potential for nursery cultivation, forest restoration programs, and ornamental use in tropical and subtropical regions.