Maintaining an appropriate balance of carbon to nitrogen metabolism is essential for rice growth and yield. Glutamine synthetase is a key enzyme for ammonium assimilation. In this study, we systematically analyzed the growth phenotype, carbon-nitrogen metabolic status and gene expression profiles in GS1;1-, GS1;2-overexpressing rice and wildtype plants. Our results revealed that the GS1;1-, GS1...

As befits its anatomical position between the sites of nutrient absorption and deposition the liver provides the metabolic hub of the body. Although the present review is confined to the regulation of N substrates it must not be forgotten that both lipid and carbohydrate metabolism are important and interactive components of hepatic function. Furthermore, hepatic production of insulin-like-grow...

Current systems for the evaluation of protein-feeds for ruminants take account of two principal nitrogen (N) requirements. One is to satisfy the needs of the rumen micro-organisms in order to maximize. microbial protein yield this N can largely be provided in any form that will give rise to enough ammonia in rumen fluid. The other N requirement is for a dietary source of true protein that wi,ll...

MPG1, a pathogenicity gene of the rice blast fungus Magnaporthe grisea, is expressed during pathogenesis and in axenic culture during nitrogen or glucose limitation. We initiated a search for regulatory mutations that would impair nitrogen metabolism, MPG1 gene expression, and pathogenicity. First, we developed a pair of laboratory strains that were highly fertile and pathogenic toward barley. ...

Giordano (1963) demonstrated that nitrogen equilibrium could be achieved in chronic renal failure on a nitrogen intake which was less than the minimal nitrogen requirement for normal subjects. His diet was mainly synthetic, and a practical diet with low-protein foods was first devised by Giovannetti & Maggiore (1964), later modified to suit British palates by Shaw, Bazzard, Booth, Nilwarangkur ...

Dry matter intake, nitrogen intake, nitrogen digestibility, rumen ammonia-N and plasma urea-N concentration were measured in young rusa deer fed 4 diets containing 90 to 205 g/kg DM crude protein. The level of crude protein associated with maximal voluntary food intake and dry matter digestibility for these animals was found to be about 160 g/kg DM. Plasma urea-N was positively related to rumen...

In the fungi, nitrogen metabolism is controlled by a complex genetic regulatory circuit which ensures the preferential use of primary nitrogen sources and also confers the ability to use many different secondary nitrogen sources when appropriate. Most structural genes encoding nitrogen catabolic enzymes are subject to nitrogen catabolite repression, mediated by positive-acting transcription fac...