濃縮海洋深層水の高品質トマト水耕栽培への有効利用 : 3. 根の養水分吸収および葉の光合成に対する短期施用の効果

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The concentrated deep seawater, which is highly enriched in not only Na but useful minerals such as Mg, K and Ca, is expected to be applicable to the production of high quality tomatoes enriched in sugar, acid, minerals, etc. In order to establish the suitable application of the concentrated deep seawater to tomato production on the basis of plant physiological responses, root uptake and leaf gas exchange were examined under the salt stress. Tomato plants (Lycopersicon esculentum Mill.) were grown in the NFT system, where the concentrated deep seawater was applied to the nutrient solution at the stage of rapid fruit growth for the short-term salt stress treatment. The water and ion uptake of roots were decreased by the short-term salt stress, but Mg2+ uptake was significantly enhanced. This brought the high accumulation of Mg into leaves. Concentrations of NO3- and PO4 3- in xylem sap under the salt stress were kept at a high level by active uptake of roots, and these concentrations were remarkably higher than those in the nutrient solution. Transpiration rate and stomatal conductance in leaves were depressed by salt stress. However, there is no significant depression in photosynthetic rate. Therefore, it was verified that the short-term application of the concentrated deep seawater can accelerate the Mg uptake by roots and the accumulation of Mg into leaves, and these contributed to keep the photosynthetic activity moderately under the salt stress.
生態工学会の論文
2009-01-31

濃縮海洋深層水の高品質トマト水耕栽培への有効利用 : 3. 根の養水分吸収および葉の光合成に対する短期施用の効果

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