The management of orthotropic stems modulates the photosynthetic performance and biomass allocation of productive plants of Arabica coffee 1

• Published in: Revista Ceres Vol. 67; no. 6; pp. 454 - 463
• Main Authors: Colodetti, Tafarel Victor, Rodrigues, Wagner Nunes, Brinate, Sebastião Vinicius Batista, Martins, Lima Deleon, Cavatte, Paulo Cezar, Tomaz, Marcelo Antonio
• Format: Journal Article
• Language: English
• Published: Vicosa Universidade Federal de Viçosa-UFV, Revista Ceres 01-11-2020
• Subjects: Agricultural production; Biomass; Biometrics; Carbohydrates; Carbon dioxide; Coffee; Conductance; Cultivars; Densification; Efficiency; Experiments; Fruits; Gas analyzers; Gas exchange; Infrared analysis; Land use; Leaves; Nutrients; Photosynthesis; Photosynthetic apparatus; Physiology; Plantations; Plants; Production costs; Pruning; Resistance; Stems; Stomata; Stomatal conductance; Transpiration
• ISSN: 0034-737X; 2177-3491
• DOI: 10.1590/0034-737X202067060005

Gains in productivity can be observed in crops subject to densification, in addition to the possibility of decreasing production costs, enhancing land use, increasing the light use efficiency, promoting the exploration of the soil and increasing the capacity to absorb water and nutrients (Carvalho et al., 2006). Important considerations should also be raised regarding the effects of pruning on Arabica coffee plants, since the ability to change the source/drain relation for carbohydrates can be used to promote the canopy renewal and, therefore, in the rejuvenation of the photosynthetic apparatus (Pereira et al., 2013). For this, the objective of this study was to analyze the leaf gas exchange rates and biomass allocation of Arabica coffee plants cultivated with different numbers of orthotropic stems. The leaf gas exchange rates were evaluated to estimate the photosynthetic variables, using a portable infrared gas analyzer (IRGA 6400XT, Licor) to study the net photosynthetic rate of CO2 (A, pmol CO2 m2 2 stomatal conductance (gs, mol H2O m-2 s-1), transpiration rate (E, mmol H2O m-2 s-1), intercellular CO2 concentration (C, pmol mol-1).