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 (Ci), 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 Ci 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 Ci of 480 ppm. A/Q at T1 of 20-36°C, was not significant at low Ci (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.
Wang , J., Zou, Z. and Weerakkody, W.A.P. (2014). OPTIMIZATION OF LEAF PHOTOSYNTHESIS OF TOMATO THROUGH MICRO-CLIMATE CONTROL. Acta Hortic. 1037, 593-597
light response, PAR, CO2 enrichment, temperature control, net assimilation