The Molecular Basis of Host Specificity in the Rhizobium Leguminosarum-Plant Interaction

1994 ◽  
pp. 91-98 ◽  
Author(s):  
Herman P. Spaink ◽  
Guido V. Bloemberg ◽  
André H. M. Wijfjes ◽  
Tita Ritsema ◽  
Otto Geiger ◽  
...  
Keyword(s):  
Host Specificity ◽  
Molecular Basis ◽  
Rhizobium Leguminosarum ◽  
Plant Interaction

scholarly journals Lysogeny in Rhizobium Leguminosarum and Rh. Trifolii

1963 ◽  
Vol 16 (3) ◽  
pp. 597 ◽  
Author(s):  
E A Schwinghamer ◽  
DJ Reinrardt
Keyword(s):  
Host Range ◽  
Host Specificity ◽  
Ultraviolet Light ◽  
Rhizobium Leguminosarum ◽  
Clear Plaque ◽  
Rhizobial Species ◽  
Lysogenic Conversion ◽  
Light Inducibility

Seven lysogenic strains-three of Rh. legumino8urum and four of Rh. trifoliiwere identified among a total of 54 strains from these two species and Rh. phaseoli. The Rh.leguminosarum strains may be multiply lysogenic; two of them also produce lethal agents resembling bacteriocins in their effect. Lysogeny was confumed by standard criteria of ultraviolet light inducibility, self.immunity, and reductive ability. Lysogenic conversion involving symbiotic characteristics was not observed. A minimum of six different temperate phages and two clear-plaque-forming variant phages were identified. The host range includes strains of the above three rhizobial species, but not of Rh. melilotii. Variation in host specificity of some phages following host passage is under investigation.

scholarly journals Molecular basis of host specificity in human pathogenic bacteria

2014 ◽  
Vol 3 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Xiaolei Pan ◽  
Yang Yang ◽  
Jing-Ren Zhang
Keyword(s):  
Host Specificity ◽  
Molecular Basis ◽  
Pathogenic Bacteria ◽  
Human Pathogenic Bacteria

Molecular basis of symbiotic host specificity in rhizobium meliloti: nodH and nodPQ genes encode the sulfation of lipo-oligosaccharide signals

Cell ◽  
1991 ◽  
Vol 67 (6) ◽  
pp. 1131-1143 ◽  
Author(s):  
Philippe Roche ◽  
Frédéric Debellé ◽  
Fabienne Maillet ◽  
Patrice Lerouge ◽  
Catherine Faucher ◽  
...  
Keyword(s):  
Host Specificity ◽  
Molecular Basis ◽  
Rhizobium Meliloti

scholarly journals The structure of the Plasmodium falciparum EBA175 ligand domain and the molecular basis of host specificity

2006 ◽  
Vol 22 (4) ◽  
pp. 143-145 ◽  
Author(s):  
Debasish Chattopadhyay ◽  
Julian Rayner ◽  
Amy M. McHenry ◽  
John H. Adams
Keyword(s):  
Plasmodium Falciparum ◽  
Host Specificity ◽  
Molecular Basis

scholarly journals Competitive Nodulation Blocking of cv. Afghanistan Pea Is Related to High Levels of Nodulation Factors Made by Some Strains of Rhizobium leguminosarum bv. viciae

2002 ◽  
Vol 15 (1) ◽  
pp. 60-68 ◽  
Author(s):  
Bridget Hogg ◽  
Andrea E. Davies ◽  
Karen E. Wilson ◽  
Ton Bisseling ◽  
J. Allan Downie
Keyword(s):  
Gene Expression ◽  
Host Specificity ◽  
Rhizobium Leguminosarum ◽  
Gene Region ◽  
Nod Factors ◽  
Nod Factor ◽  
Present Evidence ◽  
Factor Production ◽  
Nodulation Factors ◽  
Nod Gene Expression

Cultivar Afghanistan peas are resistant to nodulation by many strains of Rhizobium leguminosarum bv. viciae but are nodulated by strain TOM, which carries the host specificity gene nodX. Some strains that lack nodX can inhibit nodulation of cv. Afghanistan by strain TOM. We present evidence that this “competitive nodulation-blocking” (Cnb) phenotype may result from high levels of Nod factors inhibiting nodulation of cv. Afghanistan peas. The TOM nod gene region (including nodX) is cloned on pIJ1095, and strains (including TOM itself) carrying pIJ1095 nodulate cv. Afghanistan peas very poorly but can nodulate other varieties normally. The presence of pIJ1095, which causes increased levels of Nod factor production, correlates with Cnb. Nodulation of cv. Afghanistan by TOM is also inhibited by a cloned nodD gene that increases nod gene expression and Nod factor production. Nodulation of cv. Afghanistan can be stimulated if nodD on pIJ1095 is mutated, thus severely reducing the level of Nod factor produced. Repression of nod gene expression by nolR eliminates the Cnb phenotype and can stimulate nodulation of cv. Afghanistan. Addition of Nod factors to cv. Afghanistan roots strongly inhibits nodulation. The Cnb+ strains and added Nod factors inhibit infection thread initiation by strain TOM. The sym2A allele determines resistance of cv. Afghanistan to nodulation by strains of R. leguminosarum bv. viciae lacking nodX. We tested whether sym2A is involved in Cnb by using a pea line carrying the sym2A region introgressed from cv. Afghanistan; nodulation in the introgressed line was inhibited by Cnb+ strains. Therefore, the sym2A region has an effect on Cnb, although another locus (or loci) may contribute to the stronger Cnb seen in cv. Afghanistan.

scholarly journals Genomic insights into the host specific adaptation of the Pneumocystis genus

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ousmane H. Cissé ◽  
Liang Ma ◽  
John P. Dekker ◽  
Pavel P. Khil ◽  
Jung-Ho Youn ◽  
...  
Keyword(s):  
Host Specificity ◽  
Genome Sequence ◽  
Molecular Basis ◽  
Sequence Data ◽  
Host Adaptation ◽  
Whole Genome Sequence ◽  
Whole Genome ◽  
Specific Adaptation ◽  
Genetic Features

AbstractPneumocystis jirovecii, the fungal agent of human Pneumocystis pneumonia, is closely related to macaque Pneumocystis. Little is known about other Pneumocystis species in distantly related mammals, none of which are capable of establishing infection in humans. The molecular basis of host specificity in Pneumocystis remains unknown as experiments are limited due to an inability to culture any species in vitro. To explore Pneumocystis evolutionary adaptations, we have sequenced the genomes of species infecting macaques, rabbits, dogs and rats and compared them to available genomes of species infecting humans, mice and rats. Complete whole genome sequence data enables analysis and robust phylogeny, identification of important genetic features of the host adaptation, and estimation of speciation timing relative to the rise of their mammalian hosts. Our data reveals insights into the evolution of P. jirovecii, the sole member of the genus able to infect humans.

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