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|標題:||The fluctuation of carbohydrates and nitrogen compounds in flooded wax-apple trees||作者:||Hsu, Y.M.
|關鍵字:||carbon/nitrogen ratio;free amino acid;glutamine synthetase;nitrate;reductase;nitrogen;soluble protein;soluble sugar;starch;Syzygium;samarangense;pinus-serotina seedlings;amino-acids;rice roots;anoxia;accumulation;nitrate;shoots;carbon;translocation;plants||Project:||Botanical Bulletin of Academia Sinica||期刊/報告no：:||Botanical Bulletin of Academia Sinica, Volume 40, Issue 3, Page(s) 193-198.||摘要:||
The present study associates the response to flooding of potted wax-apple trees, Syzygium samarangense Merr. et Perry, with changes in carbon and nitrogen metabolism. In wax-apple leaves, the starch content conspicuously increased after 14 days of flooding, and the total nitrogen content decreased after 35 days of flooding. In roots, concentrations of total soluble sugars significantly increased after 14 days of flooding. The accumulation of starch in flooded wax-apple leaves and increased soluble sugar content in roots apparently were the result of the reduction of growth and metabolic activities in roots after flooding, which reduced the sink demand of carbohydrates. Soluble protein concentration significantly decreased after 7 days of flooding, but remained similar among 14-, 28- and 42-day flooding treatments. Free amino acid content of flooded plants was significantly higher than that of the control at all sampling dates. The activity of glutamine synthetase in leaves significantly decreased after 7 days of flooding, but was higher than the control's at 14, 28 and 42 days of flooding. In wax-apple roots, content of soluble protein, free amino acids, ammonia and the activity of nitrate reductase and glutamine synthetase all decreased significantly after flooding. Apparently, nitrogen metabolism was restricted in the roots during flooded conditions.
|Appears in Collections:||生命科學系所|
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