Exogenous microbial consortia modulate rhizosphere microbiome and yield of grafted tomato grown in the mediterranean greenhouse.
Al Achkar N, Privitera GF, Arena D, Nicotra R, Ciccarello L
Soil Health
If you've ever grafted tomatoes onto disease-resistant rootstocks, the microbes you add to the soil could either amplify or undercut your harvest depending on which variety combination you chose.
Researchers tested two commercial products containing beneficial microbes on grafted tomato plants growing in greenhouse soil that had been worn down by years of intensive farming. The microbes didn't stick around in large numbers, but they quietly reshuffled the entire community of fungi and bacteria already living around the roots. Whether this reshuffling helped or hurt yields came down entirely to which tomato variety was grafted onto which rootstock — a reminder that plants and soil life don't respond to treatments in a one-size-fits-all way.
Key Findings
Microbial consortia increased yield by 9.1–12.6% in three grafting combinations but reduced yield by 22.4% in one combination (NG/S2), showing strong plant-genotype dependency.
Inoculated microorganisms were rarely detectable in treated soils at significant levels, yet they caused pronounced shifts in the broader rhizosphere microbial community, suggesting indirect ecological cascades rather than direct colonization.
Fungal communities (especially Ascomycota and Basidiomycota) were shaped by both grafting combination and microbial treatment, while bacterial communities responded more strongly to microbial consortia application than to grafting.
chevron_right Technical Summary
Adding beneficial microbial mixtures to the soil of grafted tomatoes in Mediterranean greenhouses can boost yields by up to 12.6%, but the effect depends heavily on which rootstock-scion combination is used — the wrong pairing can actually reduce yields by over 22%.
Abstract Preview
The adoption of sustainable agricultural practices for intensive horticultural production could determine less damage to the ecosystem is a fundamental need increasing worldwide. In this trial the ...
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