Environmental Factors Influencing Numbers of Rhizobium leguminosarum biovar trifolii and Its Bacteriophages in Two Field Soils
AUTOR(ES)
Lawson, Kerrie A.
RESUMO
Fluctuations in numbers of Rhizobium leguminosarum biovar trifolii and its bacteriophages in two fields with different soil types were followed during a 17-month period in 1981 and 1982. Mean levels of both phage and rhizobia varied significantly (P < 0.05) on different occasions, with rhizobial levels varying from 1.6 × 102 to 2.0 × 104 cell per g of soil and phage from 0 to 1.7 × 104 PFU/g of soil. Multivariate regression analysis showed rhizobial levels to be significantly and positively related to vegetation height and solar radiation, but not to mean temperature, precipitation, soil matric potential, or soil type. Rhizobiophage concentrations were significantly and positively related to soil matric potential and vegetation height. They were reduced in the silty clay loam soil, although the presence of 34% clay did not prevent phage multiplication and the occurrence of high phage levels.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=203819Documentos Relacionados
- Synthesis of cyclic beta-(1,2)-glucans by Rhizobium leguminosarum biovar trifolii TA-1: factors influencing excretion.
- Genetic Structure of Rhizobium leguminosarum biovar trifolii and viciae Populations Found in Two Oregon Soils under Different Plant Communities †
- Regulation of phenolic catabolism in Rhizobium leguminosarum biovar trifolii.
- Cell-associated pectinolytic and cellulolytic enzymes in Rhizobium leguminosarum biovar trifolii.
- Isolation of Rhizobium leguminosarum (biovar trifolii) Strains from Ethiopian Soils and Symbiotic Effectiveness on African Annual Clover Species
