Nitrogen Metabolism and Amino Acid Biosynthesis in Crop Plants

Effects of Supplemental Nitrate Application on the Activity of Some Nitrogen Assimilation Enzymes and Leaf Tissue Productivity in Maize Seedlings

“…It is considered that nitrate reductase, nitrite reductase, glutamine synthetase, and GOGAT are involved in such activities, as discussed in several recent reviews (3,4,19). Among these enzymes, nitrate reductase activity has been most extensively studied by many workers.…”

“…These findings suggest that the enzyme level affects the vegetative growth of the plants. Few data are presently available on the regulatory aspect of this enzyme although most studies on the enzyme have been focus sed mainly on its inter-and intracellular localization and its properties since MIFLIN and his colleagues (4) outlined the contribution of the GO GAT/glutamine synthetase system to amino acid biosynthesis in higher plants. Further studies including serological ones are required to determine whether the enhancement of GOGAT activity is due to de novo "Synthesis.…”

“…the assimilation of nitrate into amino acids nitrate reductase is thought to be the most limiting enzyme. Such a potentially important role of this enzyme has drawn the attention of many workers, who conducted studies including the regulation of the enzyme by ambient N (3, 4). The other enzymes involved in nitrate assimilation, however, have not been studied as extensively as has nitrate reductase.…”

Some effects of nitrate and light intensity on soybean root growth and development

“…It has been proposed that nitrate assimilation in leaves under saturating light consumes less energy than does assimilation in the dark or in nonsaturating conditions (Abrol et al, 1983;Miflin, 1980). Therefore, it seems likely that an advantage that nitrate nutrition may have in terms of energy requirements as compared to nitrogen fixation, should be maximized under conditions of high light intensity in plants assimilating nitrate mainly in the leaves.…”

Introgression of the high grain protein gene Gpc-B1 in an elite wheat variety of Indo-Gangetic Plains through marker assisted backcross breeding

“…However, GPC and grain yield are reported to be negatively correlated [8,14], making it difficult to breed for high GPC without a yield penalty. Although the theoretical basis for this inverse correlation has been debated [16], high GPC cereals are unlikely to be commercially successful without a financial incentive to growers.…”