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2 results on '"Riccardo Rosselli"'

1. Pangenomics of the Symbiotic Rhizobiales. Core and Accessory Functions Across a Group Endowed with High Levels of Genomic Plasticity

Author

Riccardo Rosselli, Nicola La Porta, Rosella Muresu, Piergiorgio Stevanato, Giuseppe Concheri, and Andrea Squartini

Subjects
pangenome, core genome, rhizobiales, nitrogen-fixing symbiosis, nodulation genes, functional divergence, Biology (General), QH301-705.5
Abstract

Pangenome analyses reveal major clues on evolutionary instances and critical genome core conservation. The order Rhizobiales encompasses several families with rather disparate ecological attitudes. Among them, Rhizobiaceae, Bradyrhizobiaceae, Phyllobacteriacreae and Xanthobacteriaceae, include members proficient in mutualistic symbioses with plants based on the bacterial conversion of N2 into ammonia (nitrogen-fixation). The pangenome of 12 nitrogen-fixing plant symbionts of the Rhizobiales was analyzed yielding total 37,364 loci, with a core genome constituting 700 genes. The percentage of core genes averaged 10.2% over single genomes, and between 5% to 7% were found to be plasmid-associated. The comparison between a representative reference genome and the core genome subset, showed the core genome highly enriched in genes for macromolecule metabolism, ribosomal constituents and overall translation machinery, while membrane/periplasm-associated genes, and transport domains resulted under-represented. The analysis of protein functions revealed that between 1.7% and 4.9% of core proteins could putatively have different functions.

Published
2021
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2. Response of Bacterial Communities upon Application of Different Innovative Organic Fertilizers in a Greenhouse Experiment Using Low-Nutrient Soil Cultivated with Cynodon dactylon

Author

Giuseppe Concheri, Michael Schloter, Piergiorgio Stevanato, Andrea Meneghesso, Andrea Squartini, Gaurav Sablok, Valentina Dezuani, Lisanna Peserico, Adriano Altissimo, Riccardo Rosselli, Marina Zanardo, and Marion Engel

Subjects
0301 basic medicine, 030106 microbiology, Settore BIO/03 - BOTANICA AMBIENTALE E APPLICATA, Soil Science, Greenhouse, engineering.material, Biology, Crop, 03 medical and health sciences, Nutrient, organic fertilizers, bacterial communities, 16S amplicons, 16s Amplicons, Bacterial Communities, Organic Fertilizers, Earth-Surface Processes, Crop yield, food and beverages, 04 agricultural and veterinary sciences, Cynodon dactylon, biology.organism_classification, Agronomy, Soil water, 040103 agronomy & agriculture, engineering, 0401 agriculture, forestry, and fisheries, Species evenness, Fertilizer
Abstract

Assessing the response of microbial communities to nutrient inputs in man-managed soils is of primary importance to understand the impact on ecosystem services provided by the soil microbiome. In this study, a low-nutrient soil was supplemented with seven different innovative fertilizers including matrixes of plant, animal, fungal or synthetic origin, and dosed to deliver the same amount of nitrogen. Growth of a potted grass crop (Cynodon dactylon) was recorded and the fertilizers were scored by the plant yield obtained in a greenhouse study. Soil was sampled at 9 and 58 days after the addition and bacterial community composition was analyzed after soil DNA extraction through pyrosequencing of 16S rDNA gene amplicons. Over 900 bacterial genera were detected, belonging to 21 described and 19 candidate phyla. In spite of the equal dose of nitrogen delivered, specific groups were fostered by given fertilizers, in particular marked effects on some phyla were displayed by a yeast-based fertilizer, which was also most effective in plant productivity. The main shifts were observed shortly after the fertilizer application, followed by a gradual stabilization of the equilibrium and by a rise in community evenness.

Published
2018
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