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Effect of root temperature on the physiology of solution cultured lettuce.
|關鍵字:||Lettuce;萵苣;solution culture;root temperature.;水耕;根溫.||出版社:||園藝學系||摘要:||
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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