High Temperature Effect on Root Absorption

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Abstract

Dynamic and simultaneous evaluation of rates of water and nutrients uptake by intact roots was enabled in the hydroponic systems. Rates of water and nutrients uptake were evaluated simultaneously on the basis of time courses analyses of water balance and nutrients balance in the systems, and these also enabled estimation of nutrients concentration in xylem sap. Root hydraulic conductance was also measured by using the high pressure flow meter with a pressure tank at different root temperatures. <br>　Water and nutrients uptake rates varied depending on irradiance. Just after the start of treatment with high root temperature, water and nutrients uptake was activated, but several days after, the high temperature treatment brought significant depression in water and nutrients uptake rates. Lower nutrient concentration in xylem sap was also found under the higher root temperatures, and this suggested that the high root temperature retarded active nutrients transport. Furthermore, growth depression and color change in roots were caused several days after the start of the high root temperature treatment. Those results suggest that short-term and long-term effects of the high root temperature appeared in different manners through different processes.

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