R Factor Transfer in Rhizobium leguminosarum
نویسندگان
چکیده
منابع مشابه
Rhizobium gone native: unexpected plasmid stability of indigenous Rhizobium leguminosarum.
Lateral transfer of bacterial plasmids is thought to play an important role in microbial evolution and population dynamics. However, this assumption is based primarily on investigations of medically or agriculturally important bacterial species. To explore the role of lateral transfer in the evolution of bacterial systems not under intensive, human-mediated selection, we examined the associatio...
متن کاملCongo Red Absorption by Rhizobium leguminosarum.
Congo red absorption is generally considered a contraindication of Rhizobium. However, R. leguminosarum takes up the dye on yeast extract-mannitol agar. The uptake of congo red varies among strains of R. leguminosarum, as shown elsewhere with strains of R. trifolii and R. meliloti. Congo red absorption does not distinguish rhizobia from other bacteria, but may be useful as a strain marker.
متن کاملQuorum-sensing-regulated transcriptional initiation of plasmid transfer and replication genes in Rhizobium leguminosarum biovar viciae.
Transfer of the Rhizobium leguminosarum biovar viciae symbiosis plasmid pRL1JI is regulated by a cascade of gene induction involving three LuxR-type quorum-sensing regulators, TraR, BisR and CinR. TraR induces the plasmid transfer traI-trb operon in a population-density-dependent manner in response to N-acylhomoserine lactones (AHLs) made by TraI. Expression of the traR gene is primarily induce...
متن کاملبررسی برخی خصوصیات فیزیولوژیک Rhizobium leguminosarum bv. viciae بومی ایران
نیتروژن یکی از مهمترین و پرنیازترین عناصر برای رشد گیاهان است. نیتروژن در کشاورزی، معمولا از طریق کود شیمیایی در اختیار گیاه قرار می‌گیرد که باعث مشکلات زیست محیطی فراوانی می‌شود.. تثبیت زیستی نیتروژن از پدیده‌های طبیعی و استثنایی است که توسط گروهی از باکتری‌ها از جمله ریزوبیوم‌ها انجام می‌شود. باکتری اختصاصی همزیست تثبیت کننده نیتروژن باقلا Rhizobium leguminosarum bv. viciae می‌باشد. یکی از را...
متن کاملSymbiotic plasmid rearrangement in Rhizobium leguminosarum bv. viciae VF39SM.
A rearrangement between the symbiotic plasmid (pRleVF39d) and a nonsymbiotic plasmid (pRleVF39b) in Rhizobium leguminosarum bv. viciae VF39 was observed. The rearranged derivative showed the same plasmid profile as its parent strain, but hybridization to nod, fix, and nif genes indicated that most of the symbiotic genes were now present on a plasmid corresponding in size to pRleVF39b instead of...
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ژورنال
عنوان ژورنال: Microbiology
سال: 1974
ISSN: 1350-0872,1465-2080
DOI: 10.1099/00221287-84-1-188