Four Rhizobium strains were isolated from berseem clover in Egypt. The symbiotically effective, salt-tolerant, strain Rhiz950 was identified as new species, Rhizobium aegypticaum sv. trifolii (USDA 7124(T)). The other three thermal- and pH-tolerant strains were identified as Rhizobium bangladeshense sv. trifolii, the type strain is USDA 7125(T).

Titanium dioxide nanoparticles (TiO2 NPs) are in consideration to be used in plant protection products. Before these products can be placed on the market, ecotoxicological tests have to be performed. In this study, the nitrogen fixing bacterium Rhizobium trifolii and red clover were exposed to two TiO2 NPs, i.e., P25, E171 and a non-nanomaterial TiO2. Growth of both organisms individually and t...

The American serpentine leaf mining fly, Liriomyza trifolii, whose larva feeds on more than 120 plant species is well characterized by its high degree of polyphagy. Observations on the oviposition behavior by L. trifolii demonstrated that among cucurbitaceous plants, Momordica charantia is rarely attacked by L. trifolii. The methanol extract of M. charantia leaves strongly deterred the females ...

The effects of root diffusates of selected plants within the families Chenopodiaceae and Cruciferae and the hatching agent zinc chloride were tested for their effects on hatching and emergence of juveniles from cysts of Heterodera schachtii and a race of H. trifolii parasitic on Chenopodaceae and Cruciferae in The Netherlands. Although all diffusates strongly stimulated hatching of juveniles of...

A reduction in the viability of cowpea rhizobia was observed when Rhizobium trifolii IARI and cowpea Rhizobium strain 3824 were inoculated together in soil. The reduction in number of cowpea rhizobia in soil was found to be associated with the reduction in number of nodules per plant and retardation in plant growth. An antimicrobial substance was isolated from R. trifolii which, on electron mic...

Penetration of 3-day-old 'Kenland' red clover seedlings by Heterodera trifolii Goffart and Pratylenchus penetrans (Cobb) was investigated in 50-mm petri dishes on 1% agat or discs of Miracloth(R) (Chicopee Mills, Inc., New York, N.Y. 10018). Penetration by both nematodes increased arithmetically with increased numbers in the inoculum. H. trifolii larvae slowly penetrated all root tissue but in ...

The patterns of O-acetylation of the exopolysaccharide (EPS) from the Sym plasmid-cured derivatives of Rhizobium leguminosarum bv. trifolii strain LPR5, R. leguminosarum bv. trifolii strain ANU843 and R. leguminosarum bv. viciae strain 248 were determined by 1H and 13C NMR spectroscopy. Beside a site indicative of the chromosomal background, these strains have one site of O-acetylation in commo...