Photosynthetic capacity of 15 robusta coffee clones (Coffea canephora)

Gas exchange: net photosynthesis rate (A), transpiration (E), stomatal conductance (gs), CO2 intercellular concentration (Ci) and water use efficiency (WUE=A/E) of 15 different clones of robusta coffee (Coffea canephora) were evaluated. The responses curves of photosynthesis (A) to the photosynthetic photon flux density (PFD; A vs PFD) and of A to Ci (A vs Ci) of 6 robusta clones: SICA 1, 2, 3, 4, CONILON 1 and ECU ROBUSTA 01, were assess, in order to obtain information on photosynthetic capacity of robusta coffee. The seedlings were grown in an umbracle, in a completely randomized statistical design in the Botanical garden at  Mutile Experimental Station; seedlings were watered every three days and fertilized during the experiment to keep the plants vigorous, in order to guarantee good physiological performance. Gas exchange parameters were significantly  differences between  clones: A showed values  of 9,5 and 15 mmol m-2 s-1,  gs (198- 375 mmol m-2 s-1) and  WUE  varied between 2,6 and 5,8 mmol CO2  mol H2O-1. The highest A and WUE were found in clones (ECU ROBUSTA 01, CONILON 1 and CONILON2). A Significant differences in A vs PFD and A vs Ci curves were found in the ECU ROBUSTA 01, CONILON 1 and SICA’s clones. In conclusion, significant differences found among robusta coffee clones studied, being the ECU ROBUSTA 01, CONILON 1 and SICA 1 clones due to their greater photosynthetic capacity, which could have high productivity in Esmeraldas

• Auteur principal: Tezara Fernández, Wilmer Adelso (author)
• Autres auteurs: Mendoza Cortez, Patricia Jacqueline (author), Loyaga Guerrero, Walter Daniel (author), Reynel Chila, Víctor Hugo (author), Bolaños Ortega, Milton José (author)
• Format: article
• Langue: spa
• Publié: 2020
• Accès en ligne: https://revistasespam.espam.edu.ec/index.php/Revista_ESPAMCIENCIA/article/view/206