水耕ポット試験によるキャベツ幼植物のカドミウム吸収に及ぼす培養液中カルシウム濃度の影響
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概要
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The effect of different concentrations of calcium( Ca) in nutrient medium on the growth of-, and cadmium( Cd) uptake by seedlings of cabbage( Brassica oleracea L. cv. Kinkei 201; Sakata Seed Co., Japan) was studied under hydroponic culture. The nutrient solutions containing different combinations of 0, 0.44, and 0.89 μ mol l − 1 Cd and 3.0, 5.0, and 7.5 mmol l − 1 Ca were applied for a period of 14 days. No significant difference in the growth of seedlings was observed with different concentrations of Cd and Ca. The Cd concentration in the shoots grown in 5.0 mmol l − 1 Ca or 7.5 mmol l − 1 Ca medium significantly decreased to 41 % –63 % or 45% –58% of those in 3.0 mmol l − 1 Ca plus 0.44 or 0.89 μ mol l − 1 Cd medium, respectively. Higher Ca concentration in the medium resulted in decreased concentration and translocation of Cd in the shoots. The Cd concentration in the roots grown in 7.5 mmol l − 1 Ca medium was 3.1-times higher than that in 3.0 mmol l − 1 Ca plus 0.44 μ mol l − 1 Cd medium; however, no significant difference was observed using different Ca concentrations with 0.89 μ mol l − 1 Cd. No significant difference in the Ca concentration and content in the shoots were observed between all Ca treatments. The Ca concentration in the roots in 5.0 mmol l − 1 Ca was 7-times higher than that in 3.0 mmol l − 1 Ca plus 0.44 μ mol l − 1 Cd medium. In 0.89 μ mol l − 1 Cd medium, the Ca concentration in the roots with 5.0 mmol l − 1 Ca was 2-times higher than that in 3.0 mmol l − 1 Ca, but was lower than that in 3.0 mmol l − 1 Ca. The Ca concentration in the roots was 1.7–2.8-times higher than that in 3.0 mmol l − 1 Ca medium. When Ca concentration in the medium was high, the concentrations of Cd and Ca in the shoots decreased, but those in the roots increased. The decrease of Cd concentration in the shoots due to high Ca concentration in the culture medium was probably due to higher Cd and Ca concentrations in the roots.
- 2012-03-31