Photosynthetica 2024, 62(4):351-360 | DOI: 10.32615/ps.2024.031

Hydraulic conductivity and photosynthetic capacity of seedlings of Coffea canephora genotypes

J.A. MACHADO FILHO1, P.R. COSTA1, L. DE O. ARANTES1, S. DOUSSEAU-ARANTES1, W.P. RODRIGUES2, J. CRASQUE1, E. CAMPOSTRINI3
1 Capixaba Research Institute, Technical Assistance and Rural Extension, BR 101, Km 151, Bebedouro (Cx postal 62), Linhares, ES, Brazil
2 Center for Agricultural, Natural, and Literature Sciences, State University of the Tocantins do Maranhão Region, Avenida Brejo do Pinto, S/N, 65975-000, MA, Brazil
3 Plant Physiology Sector, State University of Norte Fluminense, Center for Sciences and Agricultural Technologies (CCTA), Avenida Alberto Lamego, 2000, 28015-620, Campos dos Goytacazes, RJ, Brazil

The aim was to investigate the morphological, photosynthetic, and hydraulic physiological characteristics of different genotypes of Coffea canephora under controlled cultivation conditions. Growth, conductance, and hydraulic conductivity of the root system of 16 C. canephora genotypes were evaluated in Experiment 1 (November 2013). In Experiment 2 (December 2014), in addition to the previous characteristics, gas exchange, photochemical efficiency, leaf water potential, and leaf hydraulic conductivity were investigated in five genotypes. No significant differences were observed in specific leaf hydraulic conductance, stomatal density, or gas exchange. The correlation between root hydraulic conductance and leaf area and dry mass indicates a physiological balance, reflecting the root system's ability to supply water to the aerial parts and maintain leaf water potential and photosynthetic activity during periods of high atmospheric evapotranspiration. These characteristics are important for genotypes cultivated under low water supply and high evaporative demand, even under irrigation.

Additional key words: coffee robusta; conductance; photosynthesis; root system; water transport.

Received: April 25, 2024; Revised: July 3, 2024; Accepted: August 13, 2024; Prepublished online: November 11, 2024; Published: December 19, 2024  Show citation

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MACHADO FILHO, J.A., COSTA, P.R., DE ARANTES, L.O., DOUSSEAU-ARANTES, S., RODRIGUES, W.P., CRASQUE, J., & CAMPOSTRINI, E. (2024). Hydraulic conductivity and photosynthetic capacity of seedlings of Coffea canephora genotypes. Photosynthetica, 62(4), 351-360. doi: 10.32615/ps.2024.031
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