Species-dependent effect of rhizobacteria co-inoculation in legume plants: A global meta-analysis

Rhizobacteria inoculation of plants has shown promising potential for enhancing resistance against insect pests by reducing herbivore fitness and altering herbivore-natural enemy interactions. Understanding interactions among specific rhizobacterial species and their plants in the rhizosphere is crucial for developing effective strategies to harness these benefits for pest management in agriculture. We present a meta-analysis examining the impact of rhizobacteria inoculation on herbivore interactions with plants. The findings indicate that rhizobacteria inoculation generally reduces herbivore fitness and host choice behaviours. Rhizobacteria inoculation may also enhance the recruitment of natural enemies of herbivores, thus increasing top-down predator control. The effects on herbivores varied significantly depending on the rhizobacterial species, with Bacillus spp. showing stronger effects compared to other commonly studied Pseudomonas spp. Rhizobacteria notably reduced traits such as host choice, leaf consumption, survival, and reproduction of chewing herbivores, while primarily impacting sucking herbivores by reducing reproduction. Single-strain inoculants tended to perform better, especially for sucking herbivores, suggesting potential strain incompatibility issues with multi-strain inoculants. Furthermore, field trials showed less impact on insect fitness reduction compared to experiments under controlled conditions, possibly due to soil diversity and environmental factors affecting inoculant persistence. These results underscore the need for considering broader environmental interactions when developing effective rhizobacteria-based pest management strategies. Understanding specific and generalist rhizosphere interactions can aid in developing synthetic microbial communities with broad protective functions across various plants and environments.

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Co-Inoculation of Phosphate-Solubilizing Bacteria and Rhizobia Increases Phosphorus Availability and Promotes the Development of Forage Legumes

Ríos-Ruiz,

Castro-Tuanama,

Valdez-Nuñez

et al. 2024

Agronomy

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Tropical grassland soils, especially those with alkaline properties, often exhibit limited phosphorus availability due to its precipitation in insoluble forms. Phosphate-solubilizing bacteria (PSB) and rhizobia have demonstrated their potential to enhance the availability of this nutrient and promote the growth of forage legumes. This study, conducted under controlled conditions in a mesh house, evaluated the effect of co-inoculation with PSB, including Micrococcus sp. Sfcm-14-01, Agrobacterium sp. Sfl-043-09, and Enterobacter sp. Sfcm-014-02 and Sfcm-054-06, along with rhizobia (Ensifer terangae R1-012-02 and Bradyrhizobium glycinis Rcm-025-01), under different levels of phosphorus fertilization on the legumes Leucaena leucocephala and Centrosema macrocarpum. The results indicate significant increases in various growth parameters, such as chlorophyll levels (SPAD), biomass (dry weight of roots and aerial parts) (mg), the foliar phosphorus concentration (ppm), and the concentration of available phosphorus in the soil, particularly under low-phosphorus fertilization conditions. The highest level of available phosphorus in the soil was achieved with 75% of the recommended fertilization dose, resulting in concentrations of 13.73 ppm for L. leucocephala and 7.69 ppm for C. macrocarpum, representing increases in phosphorus availability of 170.81% and 240.27%, respectively, compared with no fertilization or inoculation. These findings suggest that the co-inoculation of PSB and native rhizobia is a promising strategy to enhance the biomass productivity and mineral content of forage in tropical grazing systems, especially under phosphorus-limited conditions.

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Species-dependent effect of rhizobacteria co-inoculation in legume plants: A global meta-analysis

Cited by 3 publications

References 78 publications

Rhizobia inoculation’s impact on the biomass and moisture content of leguminous Bambara groundnut (Vigna subterranean L. Verdc)

Rhizobia inoculation’s impact on the biomass and moisture content of leguminous Bambara groundnut (Vigna subterranean L. Verdc)

Rhizobacteria inoculation of plants for reducing insect pests: A meta-analysis on insect behaviour and fitness

Co-Inoculation of Phosphate-Solubilizing Bacteria and Rhizobia Increases Phosphorus Availability and Promotes the Development of Forage Legumes

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