濃縮海洋深層水の高品質トマト水耕栽培への有効利用 : 2. 果実への師部輸送に対する短期施用の効果 [in Japanese] Effective Application of the Concentrated Deep Seawater to Soil-less Culture of High Quality Tomato : 2. Effect of Short-term Application on Phloem Transport to Fruit [in Japanese]
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A suitable application of the concentrated deep seawater for the high quality tomato production was examined by analyzing phloem transport to fruits. Tomato plants (<I>Lycopersicon esculentum Mill.</I>) 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 (only two weeks) salt stress treatment. A heat-ring method was newly applied to the tomato pedicel to evaluate phloem fluxes of sap and soluble solids and concentrations of soluble solids in the phloem sap, and effect of the short-term application of the concentrated deep seawater was analyzed with special reference to osmoregulation in the phloem transport to tomato fruits. The phloem sap flux into the fruit was decreased by the short-term salt stress, but the soluble solids flux through phloem was significantly enhanced. The concentration of soluble solids in the phloem sap was remarkably raised from the start of the salt stress treatment, which was kept at the higher levels even after the removal of the salt stress. Concentrations of K<SUP>+</SUP>, Na<SUP>+</SUP> and Mg<SUP>2+</SUP> in the phloem sap were also raised by the application of the concentrated deep seawater. From these quantitative analyses of the phloem transport to tomato fruits, it was verified that the short-term application of the concentrated deep seawater at the stage of rapid fruit growth can induce the osmoregulation in the phloem transport to fruits and produce the high quality tomatoes enriched with sugar and minerals.
Eco-Engineering 18(4), 181-188, 2006-10-31
The Society of Eco-Engineering