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標題: 根溫處理對水耕萵苣生理之影響
Effect of root temperature on the physiology of solution cultured lettuce.
作者: 方怡丹
Fang, Yi-Dan
關鍵字: Lettuce;萵苣;solution culture;root temperature.;水耕;根溫.
出版社: 園藝學系
較25℃, 30℃處理者延長;根部生理活性隨根溫增加而升高,加速根部碳水
植體內碳與氮之平衡, ;35℃處理者地上部全氮量,硝酸態氮均減少,並加
速蛋白質分解 ,致使可溶性蛋白質與游離胺基酸含量增加;另外,脯胺酸亦
片相對滲漏率以 35℃較嚴重,根部則差異不顯著.高溫處理對養液內大量

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.
Appears in Collections:園藝學系

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