Study on the respiration of crop plants : (6) Oxygen supply to the rice root through the aerial part of plant

Abstract

Using the data obtained for the oxygen content in the internal atmosphere of rice root growing in the paddy field, under different treatments (normally growing ; light limited ; and aerial part removed), and the values of respiration rate of each of these roots, as well as the relationship found between oxygen uptake and oxygen tension, we calculated the amount of oxygen supply to the root from aerial part of rice plant. Approximately 0.8mg. of oxygen is found to be supplied per hr. per lcm². of cross section of root. About 20% of the total amount of oxygen supplied was estimated to be derived from the oxygen evolved by the photosynthesis of the aerial part of plant.