Growth is defined as an orderly increase in cellular components. Microorganisms grow in a variety of physical and chemical environments. To distinguish orderly growth with that of in orderly growth, in recent years the term "balanced growth" has been used. "Balanced growth" as defined by Campbell, is doubling of every biochemical unit of the cell within the time duration of [...]
In this article we will discuss about the genetics of nitrogen fixing microorganisms. 1. Bacterial Nodulation Genes and Regulation of nod Gene Expression: In Rhizobium species, nodulation genes together with other symbiotic genes are located on large-plasmids (Sym plasmids). Sym plasmids vary from 50 to over 600 kb in R. leguminosarum bv. trifoli to 1200 to 1500 kb in R. [...]
In this article we will discuss about the process of nitrogen fixation in microorganisms. The symbiotic association of cyanobacteria with fungi (lichen), cyanobacteria with bryophytes (Anthoceros), with pteridophytes, (Azolla) with gymnosperms (coralloid root of Cycas) and bacteria (Rhizobium Brady-rhizobium, Azorhizobium, Sino-rhizobium, Ensifer and Mesorhizobium etc.) with leguminous plants are under mutual beneficial relationship (symbiosis) in which both the host and [...]