Glutamine Synthetase Activity and Foliar Nitrogen Volatilization in Response to Temperature and Inhibitor Chemicals |
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Authors: | FOSTER E F; STUTTE C A |
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Institution: | Department of Agronomy, Altheimer Laboratory, University of Arkansas Fayetteville, AR 72703, USA |
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Abstract: | In soyabeans (Glycine max (L.) Merr.), glutamine synthetase(GS) activity was greater at 28 °C than at 35 °C. Thereverse was true for foliar-N loss. In field-grown plants at29 °C, the GS activity was higher and foliar-N loss waslower in soyabeans than in Amaranthus palmeri (S.) Wats. Methioninesulphoximine, a GS inhibitor, and 6-diazo-5-oxo-L-norleucine,a glutamate synthase inhibitor, significantly increased foliar-Nloss from soyabeans. The data suggest that conditions conduciveto decreased GS or glutamate synthase activity may result inincreased foliar-N loss. Palmer amaranth, Amaranthus palmeri, soyabean, Glycine max, methionine sulphoximine, 6-diazo-5-oxo-L-norleucine |
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