Distribution of Nitrate Reductase and Nitrite Reductase, Biology

Distribution of Nitrate Reductase and Nitrite Reductase

Let us see whether nitrate assimilation depends upon the reductants produced in photosynthesis or in oxidative metabolism. It is now known that nitrate reductase and nitrite reductase are located in the photosynthetic membranes of cyanobacteria. In higher plants (C3) nitrate reductase has been shown to be a cytoplasmic enzyme and nitrite reductase a chloroplastic enzyme.

In C4 plants nitrate assimilation and carbon dioxide assimilation are compartmentalised the former located in mesophyll cells and the latter is present in bundle sheath cells. It is observed that C4 plants have greater efficiency of nitrate assimilation, in comparison to C3 plants. This is due to the special separation of nitrate and nitrite reduction from the site of CO2 reduction. Cytoplasmic nitrate reductase and chloroplastic nitrite reductase are characteristic of mesophyll cells and not of bundle sheath cells. In non-green tissues, like roots of higher plants nitrate and nitrite reductase also occur in active form.

Posted Date: 1/17/2013 5:25:57 AM | Location : United States







Related Discussions:- Distribution of Nitrate Reductase and Nitrite Reductase, Assignment Help, Ask Question on Distribution of Nitrate Reductase and Nitrite Reductase, Get Answer, Expert's Help, Distribution of Nitrate Reductase and Nitrite Reductase Discussions

Write discussion on Distribution of Nitrate Reductase and Nitrite Reductase
Your posts are moderated
Related Questions
Carbohydrates Fifty five to seventy per cent of the required energy in animals is derived from carbohydrates. However, fats and proteins can also be broken down and used for

Ross Operation :  In this technically demanding operation, the aortic valve is replaced by patient's own pulmonary valve (autograft) and a pulmonary or aortic allograft (homo

Q. What are the Physical Signs of mitral stenosis? A typical malar flush is described in mitral stenosis. It is difficult to appreciate in Indians. Pulse is normal or low volum

Q. What are the two kinds of circulatory systems? The circulatory systems can be classified into closed circulatory system and open circulatory system.

Define effect of Protein deficiency during pregnancy period? The effects of protein deficiency during pregnancy are difficult to separate from the effects of caloric deficit, s

What are the main parts of the human ear? The human ear is separated into three mains parts: the external ear, the middle ear and the internal ear. Hearing Review - Image D

Autotomy and Regeneration Shedding of body parts in self-defense to avert the attention of the predator-enemy or in any other emergency is a type of autotomy (auto: self, tom

Digestion of carbohydrates Carbohydrate digestion in vertebrates and invertebrates is very similar. All the enzymes shown in Table are not required by all animals. The enzymes

Differentiate between glycogenesis and glycogenolysis. The synthesis  of glycogen in liver and muscle  is  called glycogenesis.  The breakdown of glycogen in the liver (glycoge

Define the term - Functional magnetic resonance imaging Functional magnetic resonance imaging (fMRI) is a recent development that permits simultaneous measurements of the brain