Production of calcium-enriched lettuce (Lactuca sativa L.) using a soaking method
1995
Inoue, K. (Hiroshima Prefectural Univ., Shobara (Japan)) | Takayama, S. | Yokota, H.
For the production of Ca-enriched lettuce,increasing the Ca content in the leaves by soaking the roots in a single high-concentration Ca-salt solution (25.0 mM and 37.5 mM) for 16, 32 and 48 hours was investigated. The following results were obtained. 1) The Ca concentration in the treatment solutions increased with the length of the treatment time with the rate of increase being larger in the treatments with calcium chloride solutions than with calcium nitrate solutions. The amount of water absorbed decreased with the treatment time, but a decrease in fresh weight and wilting were not observed. 2) the Ca content in the inner and outer leaves increased with the treatment time with the rate of increase of the former was remarkably larger than that of the latter. 3) The Ca content of whole leaves was larger with the calcium nitrate treatment than with the calcium chloride treatment, with the maximum content (2.12 g kg(-1).fresh weight) being shown in the 48-h treatment with a calcium nitrate solution of 37.5 mM. 4) With this treatment method, no adverse effects on the leaves were observed and the content of K and Mg in the leaves was not lowered. These results suggest that this soaking method may be used to produce lettuce containing abundant Ca
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