Influence of an indigenous European alder (Alnus glutinosa (L.) Gaertn) rhizobacterium (Bacillus pumilus) on the growth of alder and its rhizosphere microbial community structure in two soils

Authors: Ramos, B.; Lucas García, J.A.; Probanza, A.; Domenech, J.; Javier Gutierrez Mañero, F.

Source: New Forests, Volume 25, Number 2, March 2003 , pp. 149-159(11)

Publisher: Springer

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European alder seedlings were inoculated with a suspension of the putative plant growth promoting rhizobacterium (PGPR) Bacillus pumilus (CECT 5105), or left non-inoculated (controls) in two different soils, and grown under controlled conditions. Soil A showed a thick texture, slightly acidic with a high mineral nitrogen content, while soil B showed a thin texture, basic and with a lower nitrogen content. At each sampling time, over an 8-week period, shoot and root systems of the plants were measured, nodules counted, and shoot and root length and surface were determined. In addition, changes in the microbial rhizosphere structure were evaluated by the phospholipid fatty acid (PLFA) profile extracted directly from the rhizosphere soil. The increases detected in shoot surface were significant only in soil A, while the root system was affected in both soils. In soil A, inoculation with B. pumilus caused a perturbation that subsequently disappeared, while the rhizosphere community structure was seriously altered in soil B. All biometric parameters were enhanced to a greater extent in soil A, in which the inoculum did not alter the existing rhizosphere communities and nutrient availability was better.

Keywords: Biostimulant; Inoculation; PGPR; PLFAs; Rhizosphere structure

Document Type: Research Article

Affiliations: Universidad San Pablo CEU, Facultad CC. Experimentales y de la Salud, 28660, Boadilla del Monte, Madrid, Spain

Publication date: March 1, 2003

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