Differential drought tolerance in two commercial açaí cultivars: Insights from gas exchange, chlorophyll fluorescence, and antioxidant responses - Patricia C. A. Navegantes; Wagner Romulo L. Lopes Filho; Flavio Henrique S. Rodrigues; Rosane Patricia F. Chaves; Roberto L. Cunha; Lucas C. Costa; Hugo A. Pinheiro (Trees, 2026)