Abstract
Effects of anaerobic root medium and kinetin treatment of roots on plant growth, root morphology and aerenchyma resistance of buckwheat were examined. Under excessive soil moisture condition, the leaf nitrogen content, the dry matter production and the number of inflorescence were decreased. The lysigenous aerenchyma in the root was not formed, but the ratio of the area of cortex to that of root cross section was increased. The aerenchyma resistance was decreased with increases of the ratio. These observations suggest that buckwheat adapted to excessive soil moisture condition by decrease of aerenchyma resistance related to the change of cortex ratio. Application of kinetin to root medium under culture solution increased the plant dry matter and the area of cortex in root cross section. This suggest that the adaptability to excessive soil moisture condition could be improved by addition of kinetin.
