Gaseous CO2transport through the aerenchyma and intercellular spaces in relation to the uptake of CO2by rice roots

Abstract

In order to elucidate the mechanism of transport of CO₂ absorbed by rice roots, a method for the direct collection of gas from the medullary cavity of the rice plant was established and the CO₂ concentrations in the medullary cavity and bleeding sap of the rice plant were determined. CO₂ concentration in the medullary cavity was enhanced by CO₂ enrichment in the culture solution. The transport of CO₂ absorbed by the rice roots was demonstrated and it was conc1uded that the greater part of CO₂ absorbed by the roots was transferred to the tops of rice in the gaseous state. In this report, a hypothesis on the transport of CO₂ absorbed by the rice roots was proposed.