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http://dx.doi.org/10.5141/JEFB.2003.26.3.135

Effects of Nitrogen Application on the Patterns of Amino Acids, Nitrogen Contents and Growth Response of Four Legume Plants under Saline Conditions  

배정진 (경북대학교 생물학과)
추연식 (경북대학교 생물학과)
김진아 (경북대학교 생물학과)
노광수 (계명대학교 생물학과)
송종석 (안동대학교 생물학과)
송승달 (경북대학교 생물학과)
Publication Information
The Korean Journal of Ecology / v.26, no.3, 2003 , pp. 135-142 More about this Journal
Abstract
Four legume plants showed better growth by the external nitrogen supply rather than the symbiotic nitrogen fixation only under salt additions. In case of Glycine max and Phaseolus angularis, total nitrogen contents decreased by high salinity level but their amino acid levels significantly increased with the increase of salt treatments and indicated high soluble-/insoluble-N ratios. Cassia tora and Albizzia julibrissin contained less amino acids than G. max and P. angularis but total N (esp. insoluble N fraction) increased with higher salt levels. Asparagine occurred as a main amino acid especially in G. max and P. angularis and can be seen as potential N-storage form in these plants. It might be play an important role for the osmoregulation mechanism under the saline condition. Meanwhile, to investigate what kinds of nitrogen sources are effective for overcoming salt stress on soybean plants, various N forms and concentrations (NH₄NO₃-N, NO₃-N, NH₄NO₃-N; 2.5 and 5 mM) were additionally supplied to the salt gradient medium. Soybean plants treated with NH₄NO₃-N showed the best growth up to 40 mM NaCl and NO₃- fed plants indicated good growth even at 80 mM NaCl treatments. Contrary to NH₄NO₃- and NO₃- fed plants, NH₄/sup +/- fed plants showed remarkable growth reduction and died by 40 and 80 mM NaCl treatments after the first harvest (15th day). Consequently, these results suggest that salt excluding and resistant capacities of soybean plants under NaCl treatments are increased in order of NH₄ - N, control, NO₃- N and NH₄NO₃- N depending on N concentration except NH₄- N treatments.
Keywords
Amino acids; Asparagine; Four legumes; Nitrogen source; Salt;
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