RELATIONSHIP BETWEEN GAS EXCHANGES IN INTACT ROOTS AND WATER UPTAKE IN RESPONSE TO LEAF TRANSPIRATION IN HYDROPONICS
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A hydroponic system was developed for intact measurements of water uptake rate, dissolved O_2 and CO_2 concentrations in nutrient solution under controlled environment. The relationship between water uptake rate and gas exchange in intact roots of cucumber plants was analyzed in response to stomatal transpiration in the treatments that leaf transpiration was promoted by lighting and was inhibited by applying ABA and microcrystalline wax to the leaves. The decrease rate of O_2 was not necessarily associated with water uptake rate. On the other hand, increase rate of CO_2 was higher in the lighted plants in which leaf transpiration and water uptake were inhibited. The CO_2 concentration continued to increase even in O_2 deficit solution in the transpiring plants. From the fact that water uptake is caused by leaf transpiration and gas exchange in leaf is promoted in transpiring leaf, gas exchange in leaf was considered to be responsible for gas exchange in roots, and it is possible that O_2 transported from leaves to root system may be used for root respiration.
- 九州大学の論文
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