Photosynthetic Behavior of Gmelina Arborea Genotypes in Rooted Mini-Cuttings Stage under Nursery Conditions, at South Pacific of Costa Rica
Carlos Ávila Arias, Rafael Murillo Cruz, William Hernández Castro, Guerald Flores Hurtado, Olman Murillo Gamboa, Dagoberto Arias Aguilar

Abstract
The aim of this study was to determine and interpret the photosynthetic capacity of five clones of Gmelina arboreaat the stage of mini-cuttings rooted in INISEFORgreenhouse. The light response curve of the clones as well as their performance in gas exchange wasevaluated, with no statistically significant differences among them. Statistical analysis was performed using InfoStat software, an analysis of variance and comparison of means by Tukey test wasperformed. Average values were recorded for net photosynthesis (An), stomatal conductance (Gs), transpiration (E) and water use efficiency (WUE) with values of 9.63 μmol m-2 s-1, 142.83 mmol m-2 s-1, 2.40 μmol m-2 s-1y 4.16 μmol m-2 s-1,respectively. Clone 6 obtained greater physiological values for net photosynthesis (An) and stomatal conductance (Gs), and that also was located in the second place with respect to transpiration (E) and water use efficiency (WUE).

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