Abstract
ABSTRACT In order to clarify the mechanism by which calcium (Ca) alleviates manganese (Mn) phytotoxicity, barley plants were grown under the following conditions: (1) nutrient solution alone (control), (2) nutrient solution + 25 μM Mn (Mn-toxic), and (3) nutrient solution + 25 μ M Mn + 20 mM Ca (Ca-alleviated). Feeding experiments using 54Mn and 59Fe (iron) with 2.0 or 20 mM Ca to the plant roots were also conducted. The absorption and translocation of 54Mn in the control plants were lowered by the high-Ca (20 mM) feeding condition. The translocation of 54Mn to shoots of Mn-toxic or Ca-alleviated plants was also lowered by the high-Ca feeding condition, but 54Mn absorption by roots of the plants was unaffected. The absorption and translocation of 59Fe in the plants was unaffected by the high-Ca feeding condition. Calcium alleviation of Mn phytotoxicity in barley may be induced mainly by the inhibition of Mn translocation to shoots.
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