Alkali cation selectivity, with special attention to caesium, was investigated in wheat and lettuce plants grown hydroponically at constant alkali cation to potassium ratio with gradually increasing potassium supplies. Distribution of alkali cations between roots and growth medium, and between shoots and root, showed that Cs+ was taken up with higher selectivity in roots of intermediate K+-status than in those of low- or high-K+-plants. A second selective barrier at the xylem vessels, however, prevented the extensive Cs+ accumulation in the shoots. It is concluded that an occasionally high accumulation of Cs+ in plant roots may bear importance in root crops concerning radioactive fallout.
- Alkali Cations
- distribution factor (root to medium)
- distribution factor (shoot to root)
- Lactuca sativa
- Triticum aestivum L.
ASJC Scopus subject areas
- Agronomy and Crop Science
- Plant Science