OPTIMIZATION OF LEAF PHOTOSYNTHESIS OF TOMATO THROUGH MICRO-CLIMATE CONTROL

Light response of greenhouse tomato was simulated through model parameter¬ization of Rubisco-limited, RuBp regeneration-limited and TPU-limited modes of photosynthesis at varying levels of intercellular partial pressure of CO₂ (C_i), photosynthetically active radiation (PAR; Q) and leaf temperature (T₁). Non-linear regression procedure was followed to determine rate limiting parameters of net photosynthesis (A) and thus to estimate light response of net photosynthesis (A/Q) at varying C_i and T₁. A at T₁ of 14.5-20°C did not respond to higher PAR levels beyond 600 µmol m^-2 s^-1 at C_i of 480 ppm. A/Q at T₁ of 20-36°C, was not significant at low C_i (480 ppm) but increased at higher levels (970 ppm) by 60-100%, within the PAR range of 1,000-1,800 µmol m^-2 s^-1. Therefore, parameterization of the biochemical model of photosynthesis gave necessary guidance for optimization of the growing environment of greenhouse tomato.
For optimization of net photosynthesis of tomato under cold or mild weather (14.5-20°C), greenhouse climate be maintained at low light intensity, and a moderate CO₂ concentration but under hot weather (28-36°C) it might be maintained at high CO₂ and PAR levels.

International Symposium on New Technologies for Environment Control, Energy-Saving and Crop Production in Greenhouse and Plant Factory – Greensys 2013

J. Wang , Z. Zou, W.A.P. Weerakkody

light response, PAR, CO₂ enrichment, temperature control, net assimilation

https://doi.org/10.17660/ActaHortic.2014.1037.75