Photosynthetic rates of Leonia glycycarpa and Compsoneura trianae in Arosemena Tola, Amazon region, Ecuador
DOI:
https://doi.org/10.15517/wg6dnp91Keywords:
stomatal conductance, carbon dioxide, molar air flow, transpirationAbstract
Introduction. Photosynthesis in wild species has been scarcely evaluated; therefore, determining its rates is important for production management and potential exploitation. Objective. To determine the photosynthetic rates of Leonia glycycarpa and Compsoneura trianae Warb. in Arosemena Tola, Napo, Ecuador. Materials and methods. The study was conducted at the Amazon Experimental Research and Production Center in Arosemena Tola, Napo, Ecuador, in April 2023. Random sampling was performed and, using a portable environmental photosynthesis system, the following variables were recorded: photosynthesis, transpiration, stomatal conductance, substomatal CO2, leaf temperature, and molar air flow. Data were processed using Table Curve 2D software. Results. Between 13:00 and 15:00 h, L. glycycarpa reached photosynthesis values of 3.5 μmol m-2 s-1, whereas C. trianae reached 1.4 μmol m-2 s-1. Between 07:00 and 08:00 h, the highest values were recorded for transpiration rate (1.4 and 1.5 mmol m-2 s-1 for L. glycycarpa and C. trianae, respectively), stomatal water conductance (0.7 and 0.5 mol m-2 s-1 for L. glycycarpa and C. trianae, respectively) and substomatal CO2 (460 ppm for L. glycycarpa and 500 ppm for C. trianae). The highest leaf temperature in C. trianae occurred at 08:00 h, while in L. glycycarpa it occurred at 11:00 h. The mass flow between 10:00 and 13:00 h reached its minimum in C. trianae and its maximum in L. glycycarpa. Conclusions. The photosynthetic rates of L. glycycarpa and C. trianae were lower than those reported for other species in the literature, due to cloudy conditions and tree cover. Transpiration, stomatal water conductance, and substomatal CO2 were higher during the early hours of the day under higher humidity conditions.
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