▪ Abstract Nitrogen assimilation is a vital process controlling plant growth and development.
Inorganic nitrogen is assimilated into the amino acids glutamine, glutamate, asparagine, and …

This short review outlines the central role of glutamine synthetase (GS) in plant nitrogen
metabolism and discusses some possibilities for crop improvement. GS functions as the …

The term photorespiration was first used to describe a possible acceleration of tricarboxylic
acid cycle respiration in the light in photosynthotic tissues [1]. It now refers to concurrent CO2 …

Leaf senescence is a highly organized process and not a passive decay. Photosynthesizing
mesophyll cells lose their functions in an early phase, while the epidermal layer with the …

Eight mutants of barley (Hordeum vulgare cv Maris Mink) lacking the chloroplast isozyme of
glutamine synthetase (EC 6.3. 1.2.) were isolated by their inability to grow under …

Tomato plants (Lycopersicon esculentum Mill, cv. Chibli F1) grown for 10 days on control
medium were exposed to differing concentrations of NaCl (0, 25, 50, and 100mM) …

The discovery of glutamate synthases (EC 1.4. 1.13 and EC 1.4. 7.1) caused a major re-
assessment of the way in which ammonium is assimilated in bacteria and higher plants. The …

Atmospheric pollution by the oxides of nitrogen, NO and NO2, can cause reductions in
growth but rarely visible injury. This review considers their uptake into foliage, as well as …

Nitrate reductase is one of the most important enzymes in the assimilation of exogenous
nitrate—the predominant form of nitrogen available to green plants growing in soil. Activity of …

Nitrate, the principal nitrogen source of most plants, can accumulate in large quantities in
certain crop plants, notably members of the Chenopodiaceae (spinach and beet) …