Isolation and identification of the most efficient plant growth-promoting bacteria associated with canola ( Brassica napus )

Improvement in symbiotic efficiency of chickpea (Cicer arietinum) by coinoculation of Bacillus strains with Mesorhizobium sp. Cicer

“…Various bacteria including species of Azospirillum, Bacillus, Enterobacter, Pseudomonas and Serratia are commonly found in the rhizosphere of leguminous and nonleguminous crops 1,2 . The early root colonizing microorganisms, in and around the growing roots, may interact with each other 3 and with the plant in a way that may result in symbiotic, associative, neutralistic or detrimental effects depending upon the type of microorganisms involved, nutrient status in soil, abiotic and biotic soil environment and the plant defense system 4 .…”

“…Usually, these rhizosphere bacteria have been identifi ed to cause stimulation of plant growth, protection of plants from pathogens, or cause degradation of xenobiotics in the rhizosphere. For example, application of Bacillus species to seeds or roots has been shown to cause alteration in the composition of rhizosphere leading to increase in growth and yield of different crops 2,[5][6][7] . Disease suppression of alfalfa by B. cereus 8 , take-all of wheat by B. polymyxa 9,10 , reduction in pigeon pea wilt by B. subtilis strain 11 has been reported.…”

Diversity of Root Bacteria From Tobacco Cropping Systems

“…For example, four genera isolated from the rhizoplane (root surface) of canola (Brassica napus), Agrobacterium, Phyllobacterium, Pseudomonas, and Variovorax, induced an increase of root dry weight up to 52% (2). In contrast, the cell-free culture filtrate of Pseudomonas fluorescens, a plant-growth inhibiting bacterium, showed a strong inhibitory effect on wheat root elongation and the inhibitory substance(s) was synthesized when the bacterium was grown in wheat root exudates (1).…”

Emended description of the genus Phyllobacterium and description of four novel species associated with plant roots: Phyllobacterium bourgognense sp. nov., Phyllobacterium ifriqiyense sp. nov., Phyllobacterium leguminum sp. nov. and Phyllobacterium brassicacearum sp. nov.

“…Strain W3 stimulates initial root growth and de novo root development in Picea spp. (Chanway et al, 1994), strain STM 196 (a synonym of isolate 29-15) was recognized as a plant-growth-promoting bacterium in plant culture of oilseed rape (Brassica napus) (Bertrand et al, 2001;Larcher et al, 2003) and Arabidopsis thaliana (Mantelin et al, 2006) and strain BOG-1-98 promotes growth of black mangrove seedlings in artificial sea water when co-inoculated with Bacillus licheniformis (Rojas et al, 2001). Interestingly, some strains have been isolated from root nodules (Sturz et al, 1997;Rasolomampianina et al, 2005), although the capacity of the isolates to induce nodulation was not clearly demonstrated.…”