02269nab a2200289 i 4500 BR-BrBNA 20260520193154.0 260520b2020 bl.qr|pooa||| 00| 0 eng | BR-BrBNA eng F60 1190 Scalon, Silvana de Paula Quintão Kodama, Flávia Mitsuko Dresch, Daiane Mugnol Pereira, Zefa Valdivina Mussury, Rosilda Mara Scalon, Lourenço Quintão Gas Exchange in Caryocar Brasiliense Cambess Seedlings in Water Deficit Conditions Publicação on-line; 27 ref.; 3 illus.; Summary (En) Abstract In this study, we assessed the gas exchange in Caryocar brasiliense seedlings in water deficit conditions and their capacity to recover after rehydration. We assessed plant photosynthetic rates, internal carbon concentrations, stomatal conductance, transpiration rates, water-use efficiency, instantaneous carboxylation efficiency, chlorophyll index, and photosystem II quantum efficiency. All gas exchange parameters were reduced after the suspension of irrigation. Seedling photosynthetic rates approached zero after 12 days. The equilibrium was reestablished in all variables 11 days after re-initiating irrigation, with the exception of internal CO2 concentration and stomatal conductance. Exposure of seedlings to water stress resulted in drastically reduced photosynthetic processes. This reduction occurred due to the limitation of stomatal conductance and low rubisco carboxylation efficiency but not to irreversible damage photosystem II. All of these parameters demonstrated recuperation with rehydration, but only the photosynthetic rates reached initial control values. Keywords: hydric stress, native fruit, Pequi, Caryocaceae CARYOCAR BRASILIENSE PEQUI DEFICIÊNCIA HÍDRICA 2929 347957 Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0456 Floresta e Ambiente (Brazil) 1415-0980 / ISSN 2179-8087 0nline v. 27(2) p. 1-8; (2020) BR2026001261 https://www.scielo.br/j/floram/a/zTZ9R5cgfGLDk9QKrjYTSHw/?format=pdf&lang=en ANA 341885 341885