Differential effects of rhizobacterial strain and dose on the ectomycorrhizal colonization of loblolly pine seedlings.

摘要: Loblolly pine seed were inoculated at sowing with one of four plant growth-promoting rhizobacteria (PGPR) strains different rates both in the nursery and greenhouse. Seedlings harvested 4, 8, 12 wk after greenhouse 5, 10, 15 nursery. Ectomycorrhizae colonization, estimated as total number ectomycorrhizal roots per seedling averaging by gram root biomass, not evident on any treatment either 5 or 4 However, 8 sowing, many treatments significantly (P< 0.0001) inhibited formation. Generally, increasing rate all bacteria applied decreased Conversely, strain LS212 10 11 cfu resulted an increase Increases growth also dependenton bacterial rate, whereas shoot biomass was effected. Decreases ectomycorrhizae colonization accounted for 61% variation increases suggesting high metabolic costs mycorrhizal maintenance presence some rhizobacteria. differences height survival outplanting could be attributed to mycorrhizae effect. These studies demonstrate that may serve a carbon sink early development indicate complex interaction between soil microflora bacterium settings.