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http://dx.doi.org/10.5333/KGFS.2002.22.2.137

Nitrogen Assimilation and Carbohydrate Concentration as Affected by the N Supply Form and Their Level in Shoot of Perennial ryegrass (Lolium perenne L.)  

Lee, Bok-Rye (Department of Animal Science & Institute of Agricultural Science and Technology, College of Agriculture and Life Science, Chonnam National University)
Jung, Woo-Jin (Department of Animal Science & Institute of Agricultural Science and Technology, College of Agriculture and Life Science, Chonnam National University)
Kim, Dae-Hyun (Department of Animal Science & Institute of Agricultural Science and Technology, College of Agriculture and Life Science, Chonnam National University)
Kim, Kil-Yong (Department of Biological & Environment Chemistry, College of Agriculture and Life Science, Chonnam National University)
Kim, Tae-Hwan (Department of Animal Science & Institute of Agricultural Science and Technology, College of Agriculture and Life Science, Chonnam National University)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.22, no.2, 2002 , pp. 137-144 More about this Journal
Abstract
To investigate the short-term effects of N-supply form ( $NO_3\;^-$ or $NH_4\;^+$ ) and their level (0.2, 1.0 and 6.0 mM) on N assimilation and C metabolism were examined in perennial ryegrass (Lolium perenne L.). The increase in shoot fresh for $NH_4\;^+$-fed plants much less than $NO_3\;^-$ fed ones. Nitrate concentration in $NO_3\;^-$ -fed plants tended to increase with increasing the supply level, while that of $NH_4\;^+$-fed plants was nearly stable. Nitrate reductase activity (NRA) responded much quickly, showing a proportional increase within 24 h of feeding. NRA in $NO_3\;^-$ -fed plants at 72 h increased by 13.7, 40.3 and 84.0% in 0.2, 1.0 and 6.0 mM $NO_3\;^-$ -fed, but it was not changed in$NH_4\;^+$-fed plants regardless of the supply level. After 72 h of treatment the sugar accumulation in the plants supplied with 0.2 and 1.0 mM -$NH_4\;^+$fed was remarked. After 72 h of feeding, fructan hydrolysis was observed in all levels fur $NH_4\;^+$-fed plants, but only in 6.0 mM for $NO_3\;^-$ -fed plants.
Keywords
Nitrate; Nitrate reductase activity; Sugar; Fructan; Perennial ryegrass;
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