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Effect of root temperature on the physiology of solution cultured lettuce.
Cultivars lettuce "Celture" and "Majesty" were grown in nutrient solution with root-zone temperature maintaining at 25℃, 30℃, and 35℃ . Root length as well as relative growth rate of the root were inhibited by 35℃ root-zone temperature. The affected plants had less secondary roots and brown root tips. Shoot dry weight was the least with 35℃ treatment. A longer lag phase was observed on the growth curve with 35℃ as compared with 25℃ o Increasing root temperature resulted in higher root activityas datermined by TTC test, Higher activity lead to more carbohydrates consumption in the root. This, in turn, induced the export of reducing r in the root. The balance of carbon and nitrogen in plant tissue was disturbed by the supra-optimal temperature. Total nitrogen and nitrate-N declined with 35℃ root temperature, which protein degradated with 35℃. Proline content in tissue accumulated in root with the enhancement of root temperature. Translocation of proline between tissue was observed, which might be used as an index of environmental stress.The most severe with 35℃ treatment. In the root tissue, hundred percent leakage was detected due probably to the impact of high temperature treatment (35℃). Macroelements uptake by lettuce plants were also affected by the supra-optimal temperature. For both cultivar tested, the increasing root temperature reduced the absorption of N, K, and Mg, while levels of P and Ca were not affected.
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