ニンジンおよびレタス類の品種別カドミウム濃度の相対的序列推定

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  • Varietal Differences and Order of Comparative Cadmium Concentration in Carrot (Daucus carota L.), Lettuce (Lactuca sativa L.), Endiv (Cichorium endivia L.) and Chicory (Cichorium intybus L.).
  • ニンジン オヨビ レタスルイ ノ ヒンシュベツ カドミウム ノウド ノ ソウタイテキ ジョレツ スイテイ

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Three cadmium(Cd)-contaminated soils were filled into bottomless frames with about 35cm depth, and 67 varieties of carrot and/or 21 varieties of lettuce including endive and chicory were grown in 2008 fall and 2009 spring sequentially. Some additional pot experiments were conducted also, using additional varieties of these crops. Cd contents in edible parts of these crops were analyzed by ICP-MS and varietal differences of Cd concentration under different soil and cultivation were examined. Among varieties of carrot and/or lettuce, endive and chicory, some varieties showed higher Cd concentrations even when soils and growing conditions were changed, indicating difference of inherent behavior of Cd uptake. Including retrospective report data, up to 326 data of 84 carrot varieties or 214 data of 49 varieties of lettuce including endive and chicory were collected and comparative order of varietal Cd concentration was summarized as "Cd index" ± "fluctuation". Average Cd index of the five low Cd varieties of carrot was as low as 0.36 comparing with the average of five high varieties (Figure 1). Several varieties of carrot that bear purple or brilliant red root color seemed to contain higher Cd. Average Cd index of the five low Cd varieties of lettuce including endive and chicory was as low as 0.31 comparing with the average of five high varieties. Endive was the highest of the list, and several cos lettuce, butter head lettuce, loose leaf lettuce occupied the following high Cd part of the list (Figure 2).

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