pSym
pSym is a term used in microbiology to describe a class of large extrachromosomal replicons, or megaplasmids, found in rhizobia that carry genes essential for establishing legume symbioses. In many Sinorhizobium and Rhizobium species, the major pSym replicons are designated pSymA and pSymB. These elements are separate from the bacterial chromosome and can greatly influence a strain’s ability to nodulate specific hosts and fix nitrogen.
Genetic content commonly associated with pSym includes nodulation genes that initiate and regulate nodulation, regulatory genes
Role in symbiosis and host interaction is central to pSym function. These plasmids enable rhizobia to recognize
Mobility and evolution are notable features. pSym replicons can be transferred between strains by conjugation, contributing
In summary, pSym refers to symbiotic megaplasmids in rhizobia that carry essential and accessory genes for