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Glutamine synthetase activity and foliar nitrogen volatilization in response to temperature and inhibitor chemicals


Annals of Botany (London) 57(3): 305-308
Glutamine synthetase activity and foliar nitrogen volatilization in response to temperature and inhibitor chemicals
In soybeans (Glycine max (L.) Merr.), glutamine synthetase (GS) activity was greater at 28.degree. C than at 35.degree. C. The reverse was true for foliar-N loss. In field-grown plants at 29.degree. C, the GS activity was higher and foliar-N loss was lower in soybeans than in Amaranthus palmeri (S.) Wats. Methionine sulphoximine, a GS inhibitor, and 6-diazo-5-oxo-L-norleucine, a glutamate synthase inhibitor, significantly increased foliar-N loss from soybeans. The data suggest that conditions conducive to decreased GS or glutamate synthase activity may result in increased foliar-N loss.


Accession: 001604020



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