Distribution and levels of four calcium components among several cultivarsof turnip rape (Brassica napus L. and B-campestris L.) compared to other vegetables

Several kinds of vegetables and cultivars of turnip rapes were analyzed for four calcium components. The components were: 1) water soluble calcium, co nsisting of organic acid sails, inorganic salts, and calcium ion, 2) 1N NaC l soluble calcium pectate and protein binding calcium, 3) 2% acetic acid so luble calcium phosphate, and 4) 5% HCl soluble calcium oxalate. 1. Turnip rape contained the highest content of total calcium and water sol uble calcium compared to chrysanthemums, lettuce, spinach, and welsh onions . In turnip rapes, the major calcium component was water soluble calcium. 2. Among four cultivars of turnip rape (Brassica napus L.),'Miyauchina', 'S hinkirina', 'Keichikuzairai', and 'Gogatsuna', 'Keichikuzairai' had the hig hest content of water soluble calcium and 2% acetic acid soluble calcium. 3. Among three cultivars of turnip rape (Brassica campestris L.),'Komatsuna ', 'Bitaminna', and 'Haruna', 'Haruna' possessed the highest content of wat er soluble calcium.