The Concept of C4-dicarboxylic Acid Pathway

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Nitrogen Fixation in Free-Living and Associative Symbiotic Bacteria Nitrogen Fixing Bacteria Nitrogenase Genetics Mechanism of Nitrogen Fixation Response of Plants to Azotobacter Inoculation Nitrogen Fixation in the Root Zone of Rice

The Concept of C4-dicarboxylic Acid Pathway

The Concept of C4-dicarboxylic Acid Pathway
As mentioned earlier, the availability of easily assimilable carbon sub strates in the root region by way of root exudates is the crucial factor in nitrogen fixation by non-symbiotic bacteria. Tropical grasses of agricultural value such as sugarcane, maize, sorghum, Paspalum, Pennisetum, Panicum, Digitaria and Melinis which possess C4-dicarboxyliq acid pathway of photosynthesis (Hatch and Slack pathway) and are capable' of making efficient use of high light intensities and temperatures prevalent in tropics might harbour unknown nitrogen fixers.

Some of these plants are already known to harbour abundant population of Beijerinckia and Azotobacter in their rhizosphere and hence detailed investigations on the C/N status of the rhizosphere of these plants under varying environmental stresses may have to be undertaken.

Effect of Azospirillum brasilense inoculation on sorghum (Sorghum bicolor) (Var. CSH 5) (Field trial 1978-79)

Location	Nitrogen level (kg N/ha)	Grain yield (Q/ha)**		Per cent increase in yield
Location	Nitrogen level (kg N/ha)	uninoculated	Inoculated	Per cent increase in yield
Udaipur	0 40	30.1 51.4	39.3 53.3	35.6* 3.7*
Delhi	0 40	16.5 20.5	20.2 26.0	23.4 26.8*
Pantnagar	0 40	11.7 15.6	17.8 28.1	65.6 61.3*
Coimbatore	0 40	31.3 49.8	37.0 51.4	15.2 3.2
Dharwar	0 40	23.6 29.1	31.6 36.7	33.9* 26.1*
Hyderabad	0 40	30.3 45.6	41.7 43.1	37.6 -

Massive white colonies of azospirillium Amazonense isolated from the roots of coconut palm cocos nucifera on potato infusion agar lacking malate	Massive white colonies of azospirillium Amazonense isolated from the roots of coconut palm cocos nucifera on potato infusion agar lacking malate

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Nitrogen Fixing Activity of Paddy Soil in Pots under Various Treatments Nitrogen Fixation in the Rhizosphere of Grasses and Weeds Associative Symbiosis Some New Nitrogen Fixing Bacterial Associations Several Nitrogen Fixing Bacteria Response of Plants Azospirillum Inoculation The Concept of C4 Dicarboxylic Acid Pathway Nitrogen Fixation by Rhizobium in a Free Living State

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