Host: The Japanese Society of Plant Physiologists
Pages 0249
Cd accumulation in a major japonica cultivar Sasanishiki (low Cd in grains) and a indica cultivar Habataki (higher Cd in grains) were characterized to determine the traits involved in Cd accumulation in rice. The Cd treatment was first conducted under the hydroponic condition with relatively lower Cd concentration (20μg/L), which can be observed in soil solutions of paddy soils under water-saving conditions with moderate Cd contamination. The greater Cd accumulation was observed in shoots of Habataki through 2-wk Cd treatment, even after 1h Cd treatment. The analysis of xylem sap and transpiration rate indicated that greater ability and activity of root-to-shoot Cd-transport in Habataki would lead to higher Cd accumulation in their shoots. The results of pot experiments also demonstrated the higher Cd level in xylem sap of Habataki, which resulted in higher Cd content in rice grains of the cultivar.
