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Beneath the blooms: Unearthing the effect of rhizospheric bacteria on floral signals and pollinator preferences

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Author(s):
Magalhaes, Diego M. ; Lourencao, Andre L. ; Bento, Jose Mauricio S.
Total Authors: 3
Document type: Journal article
Source: PLANT CELL AND ENVIRONMENT; v. 47, n. 3, p. 17-pg., 2023-11-23.
Abstract

The relationship between plants and pollinators is known to be influenced by ecological interactions with other community members. While most research has focused on aboveground communities affecting plant-pollinator interactions, it is increasingly recognized that soil-dwelling organisms can directly or indirectly impact these interactions. Although studies have examined the effects of arbuscular mycorrhizal fungi on floral traits, there is a gap in research regarding similar effects associated with plant growth-promoting rhizobacteria (PGPR), particularly concerning floral scent. Our study aimed to investigate the influence of the PGPR Bacillus amyloliquefaciens on the floral traits of wild (Solanum habrochaites, Solanum pimpinellifolium and Solanum peruvianum) and cultivated tomato (Solanum lycopersicum), as well as the impact of microbially-driven changes in floral scent on the foraging behaviour of the stingless bee Melipona quadrifasciata. Our findings revealed that inoculating tomatoes with PGPR led to an increased number of flowers and enhanced overall floral volatile emission. Additionally, we observed higher flower biomass and pollen levels in all species, except S. peruvianum. Importantly, these changes in volatile emissions influenced the foraging behaviour of M. quadrifasciata significantly. Our results highlight the impact of beneficial soil microbes on plant-pollinator interactions, shedding light on the multiple effects that plant-microbial interactions can have on aboveground organisms. (AU)

FAPESP's process: 14/50871-0 - INCT 2014: National Institute of Science and Technology of Semiochemicals in Agriculture
Grantee:José Roberto Postali Parra
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/24492-6 - Multitrophic interactions influenced by plant growth promoting rhizobacteria in commercial and wild tomato plants
Grantee:Diego Martins Magalhães
Support Opportunities: Scholarships in Brazil - Post-Doctoral