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FLORAM receives Impact Factor

We are pleased to announce that FLORAM has received its first impact factor rating in the 2022 Journal Citation Reports (JCR).

Now FLORAM has the highest impact factor among Brazilian Forest Sciences journals.

Floresta e Ambiente
http://www.floram.periodikos.com.br/article/doi/10.1590/2179-8087.052017
Floresta e Ambiente
Original Article Conservation of Nature

Gas Exchange in Caryocar B rasiliense Cambess Seedlings in Water Deficit Conditions

Silvana de Paula Quintão Scalon; Flávia Mitsuko Kodama; Daiane Mugnol Dresch; Zefa Valdivina Pereira; Rosilda Mara Mussury; Lourenço Quintão Scalon

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Abstract

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

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