The rhizosphere microbiome of 51 potato cultivars with diverse plant growth characteristics

Author:

Martins Benoit Renaud1ORCID,Radl Viviane1,Treder Krzysztof2,Michałowska Dorota2,Pritsch Karin3,Schloter Michael14

Affiliation:

1. Research Unit for Comparative Microbiome Analysis (COMI), Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Ingolstädter Landstraße 1, 85764 Neuherberg , Germany

2. Plant Breeding and Acclimatization Institute – National Research Institute in Radzików, Bonin Division, Department of Potato Protection and Seed Science at Bonin , Bonin Str 3, 76-009 Bonin , Poland

3. Research Unit for Environmental Simulation (EUS), Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) , Ingolstädter Landstraße 1, 85764 Neuherberg , Germany

4. Chair for Environmental Microbiology, Department of Life Science Systems, School of Life Sciences, Technical University of Munich , Alte Akademie 8, 85354 Freising , Germany

Abstract

Abstract Rhizosphere microbial communities play a substantial role in plant productivity. We studied the rhizosphere bacteria and fungi of 51 distinct potato cultivars grown under similar greenhouse conditions using a metabarcoding approach. As expected, individual cultivars were the most important determining factor of the rhizosphere microbial composition; however, differences were also obtained when grouping cultivars according to their growth characteristics. We showed that plant growth characteristics were related to deterministic and stochastic assembly processes of bacterial and fungal communities, respectively. The bacterial genera Arthrobacter and Massilia (known to produce indole acetic acid and siderophores) exhibited greater relative abundance in high- and medium-performing cultivars. Bacterial co-occurrence networks were larger in the rhizosphere of these cultivars and were characterized by a distinctive combination of plant beneficial Proteobacteria and Actinobacteria along with a module of diazotrophs namely Azospira, Azoarcus, and Azohydromonas. Conversely, the network within low-performing cultivars revealed the lowest nodes, hub taxa, edges density, robustness, and the highest average path length resulting in reduced microbial associations, which may potentially limit their effectiveness in promoting plant growth. Our findings established a clear pattern between plant productivity and the rhizosphere microbiome composition and structure for the investigated potato cultivars, offering insights for future management practices.

Funder

German Research Foundation

Publisher

Oxford University Press (OUP)

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