MAXIMUM LEAF PHOTOSYNTHETIC LIGHT RESPONSE FOR CAMU CAMU (MYRCIARIA DUBIA KUNTH MCVAUGH) PLANTS IN THREE GROWTH STAGES IN THE SOUTH COLOMBIAN AMAZONIAN REGION
Photosynthetic light response curves in camu camu (Myrciaria dubia) leaves were studied in three stages of plant growth. The evaluation was carried out during the dry and humid (part of the time flooded) season in the south of the Colombian Amazon, by identifying three stages of growth corresponding to juvenile plants, young adult plants (in production) and adult plants. To characterize the leaf photosynthetic response curve to the photosynthetically active radiation in each stage of growth, measurements of CO2 were made with a portable system IRGA in plants exposed to photosynthetically active radiation values of 0-1887 µmo m-2 s-1 of photons. Assimilation curves were adjusted by the nonlinear regression method. The response rate of assimilation to photon flux described a curvilinear progression consisting of an initial linear increase in the rate of assimilation as the amount of light increased, and a subsequent gradual deceleration in the rate of assimilation as the amount of light increased further. The maximum apparent quantum yield of the species was similar for the young adult and juvenile shrubs, while maximum photosynthesis was observed at the young adult stage.
Barrera, J.A., Castro, S.Y., Hernández, M.S., Martínez, O., Fernández-Trujillo, J.P. and Melgarejo, L.M. (2012). MAXIMUM LEAF PHOTOSYNTHETIC LIGHT RESPONSE FOR CAMU CAMU (MYRCIARIA DUBIA KUNTH MCVAUGH) PLANTS IN THREE GROWTH STAGES IN THE SOUTH COLOMBIAN AMAZONIAN REGION. Acta Hortic. 928, 193-198
compensation point, photosynthesis rate, apparent quantum yield