Multifactorial experiments were performed to study the diurnal dynamics of CO2 exchange in intact cucumber plants (Cucumis sativus L.). Based on experimental data, we analyzed the models of net photosynthesis, night respiration, and biomass accumulation. This analysis allowed us to resolve the growth component of respiration and to determine the diurnal temperature pattern that is optimal for biomass accumulation. It was found that the most profound transformation of assimilates into the biomass occurs under the maximum ratio of growth respiration to maintenance respiration. Under the experimental conditions used, this requirement was fulfilled at a temperature of 25°C during the photoperiod (optimum of net photosynthesis) and at subsequent gradual cooling to a hardening temperature (13°C by the end of the night).
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 17, 2004
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