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Yuan XQ, Liu YY, Wang SC, Lu YQ, Li YJ, Chen JQ, Duan CQ. Trifolium repens L. recruits root-associated Microbacterium species to adapt to heavy metal stress in an abandoned Pb-Zn mining area. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174057. [PMID: 38914340 DOI: 10.1016/j.scitotenv.2024.174057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Revised: 06/14/2024] [Accepted: 06/14/2024] [Indexed: 06/26/2024]
Abstract
Root-associated microbiota provide great fitness to hosts under environmental stress. However, the underlying microecological mechanisms controlling the interaction between heavy metal-stressed plants and the microbiota are poorly understood. In this study, we screened and isolated representative amplicon sequence variants (strain M4) from rhizosphere soil samples of Trifolium repens L. growing in areas with high concentrations of heavy metals. To investigate the microecological mechanisms by which T. repens adapts to heavy metal stress in abandoned mining areas, we conducted potting experiments, bacterial growth promotion experiments, biofilm formation experiments, and chemotaxis experiments. The results showed that high concentrations of heavy metals significantly altered the rhizosphere bacterial community structure of T. repens and significantly enriched Microbacterium sp. Strain M4 was demonstrated to significantly increased the biomass and root length of T. repens under heavy metal stress. Additionally, L-proline and stigmasterol could promote bacterial growth and biofilm formation and induce chemotaxis for strain M4, suggesting that they are key rhizosphere secretions of T. repens for Microbacterium sp. recruitment. Our results suggested that T. repens adapted the heavy metal stress by reshaping rhizosphere secretions to modify the rhizosphere microbiota.
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Affiliation(s)
- Xin-Qi Yuan
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Central Yunnan Field Scientific Station for Restoration of Ecological Function & Yunnan International Joint Research Center of Plateau Lake Ecological Restoration and Watershed Management, Yunnan Think Tank for Ecological Civilization Construction, Yunnan University, Kunming 650091, China
| | - Yi-Yi Liu
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Southwestern United Graduate School & Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China
| | - Si-Chen Wang
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Central Yunnan Field Scientific Station for Restoration of Ecological Function & Yunnan International Joint Research Center of Plateau Lake Ecological Restoration and Watershed Management, Yunnan Think Tank for Ecological Civilization Construction, Yunnan University, Kunming 650091, China
| | - Ya-Qi Lu
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Southwestern United Graduate School & Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China
| | - Yin-Jie Li
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Central Yunnan Field Scientific Station for Restoration of Ecological Function & Yunnan International Joint Research Center of Plateau Lake Ecological Restoration and Watershed Management, Yunnan Think Tank for Ecological Civilization Construction, Yunnan University, Kunming 650091, China
| | - Jin-Quan Chen
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Southwestern United Graduate School & Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China.
| | - Chang-Qun Duan
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments & School of Ecology and Environmental Sciences, Yunnan University, Kunming 650500, China; Central Yunnan Field Scientific Station for Restoration of Ecological Function & Yunnan International Joint Research Center of Plateau Lake Ecological Restoration and Watershed Management, Yunnan Think Tank for Ecological Civilization Construction, Yunnan University, Kunming 650091, China; Southwestern United Graduate School & Institute of International Rivers and Eco-security, Yunnan University, Kunming 650500, China.
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Caldara M, Gullì M, Graziano S, Riboni N, Maestri E, Mattarozzi M, Bianchi F, Careri M, Marmiroli N. Microbial consortia and biochar as sustainable biofertilisers: Analysis of their impact on wheat growth and production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 917:170168. [PMID: 38244628 DOI: 10.1016/j.scitotenv.2024.170168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/22/2024]
Abstract
The European Union is among the top wheat producers in the world, but its productivity relies on adequate soil fertilisation. Biofertilisers, either alone or in combination with biochar, can be a preferable alternative to chemical fertilisers. However, the addition of biofertilisers, specifically plant growth promoting microbes (PGPM), could modify grain composition, and/or deteriorate the soil composition. In this study, the two wheat cultivars Triticum aestivum (Bramante) and T. durum (Svevo) were cultivated in open fields for two consecutive years in the presence of a commercial PGPM mix supplied alone or in combination with biochar. An in-depth analysis was conducted by collecting physiological and agronomic data throughout the growth period. The effects of PGPM and biochar were investigated in detail; specifically, soil chemistry and rhizosphere microbial composition were characterized, along with the treatment effects on seed storage proteins. The results demonstrated that the addition of commercial microbial consortia and biochar, alone or in combination, did not modify the rhizospheric microbial community; however, it increased grain yield, especially in the cultivar Svevo (increase of 6.8 %-13.6 %), even though the factors driving the most variations were associated with both climate and cultivar. The total gluten content of the flours was not affected, whereas the main effect of the treatments was a variation in gliadins and low-molecular-weight-glutenin subunits in both cultivars when treated with PGPM and biochar. This suggested improved grain quality, especially regarding the viscoelastic properties of the dough, when the filling period occurred in a dry climate. The results indicate that the application of biofertilisers and biochar may aid the effective management of sustainable wheat cultivation, to support environmental health without altering the biodiversity of the resident microbiome.
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Affiliation(s)
- Marina Caldara
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Mariolina Gullì
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Sara Graziano
- Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Nicolò Riboni
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Elena Maestri
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; National Interuniversity Consortium for Environmental Sciences (CINSA), Parco Area delle Scienze, 43124 Parma, Italy
| | - Monica Mattarozzi
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Federica Bianchi
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center CIDEA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Maria Careri
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy
| | - Nelson Marmiroli
- Department of Chemistry, Life Science and Environmental Sustainability, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; Interdepartmental Center SITEIA.PARMA, University of Parma, Parco Area delle Scienze, 43124 Parma, Italy; National Interuniversity Consortium for Environmental Sciences (CINSA), Parco Area delle Scienze, 43124 Parma, Italy.
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