TITLE	The fluctuation of carbohydrates and nitrogen compounds in flooded wax-apple trees
AUTHOR	Yu-Mei Hsu Department of Botany and 2Department of Horticulture, National Chung Hsing University, Taichung, Taiwan 40227, Republic of China Menq-Jiau Tseng Chin-Ho Lin Department of Botany and 2Department of Horticulture, National Chung Hsing University, Taichung, Taiwan 40227, Republic of China
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ABSTRACT	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.
KEYWORD	Carbon/nitrogen ratio; Free amino acid; Glutamine synthetase; Nitrate reductase; Nitrogen; Soluble protein; Soluble sugar; Starch; Syzygium samarangense;
ARTICLE INFO	Botanical Bulletin of Academia Sinica, Volume 40 Number 3 July 1999, page 193-198, 6 pages
PUBLISHER	Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China