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Daraz U, Erhunmwunse AS, Dubeux JCB, Mackowiak C, Guerra VA, Hsu CM, Ma J, Li Y, Yang X, Liao HL, Wang XB. Soil Bacterial Communities Across Seven Rhizoma Peanut Cultivars (Arachis glabrata Benth.) Respond to Seasonal Variation. Microb Ecol 2023; 86:2703-2715. [PMID: 37507489 DOI: 10.1007/s00248-023-02277-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 07/24/2023] [Indexed: 07/30/2023]
Abstract
Soil microorganisms play key roles in soil nutrient transformations and have a notable effect on plant growth and health. Different plant genotypes can shape soil microbial patterns via the secretion of root exudates and volatiles, but it is uncertain how a difference in soil microorganisms induced by crop cultivars will respond to short-term seasonal variations. A field experiment was conducted to assess the changes in soil bacterial communities of seven rhizoma peanut (Arachis glabrata Benth, RP) cultivars across two growing seasons, April (Spring season) and October (Fall season). Soils' bacterial communities were targeted using 16S rRNA gene amplicon sequencing. Bacterial community diversity and taxonomic composition among rhizoma peanut cultivars were significantly affected by seasons, cultivars, and their interactions (p < 0.05). Alpha diversity, as estimated by the OTU richness and Simpson index, was around onefold decrease in October than in April across most of the RP cultivars, while the soils from Arblick and Latitude had around one time higher alpha diversity in both seasons compared with other cultivars. Beta diversity differed significantly in April (R = 0.073, p < 0.01) and October (R = 0.084, p < 0.01) across seven cultivars. Bacterial dominant taxa (at phylum and genus level) were strongly affected by seasons and varied towards more dominant groups that have functional potentials involved in nutrient cycling from April to October. A large shift in water availability induced by season variations in addition to host cultivar's effects can explain the observed patterns in diversity, composition, and co-occurrence of bacterial taxa. Overall, our results demonstrate an overriding effect of short-term seasonal variations on soil bacterial communities associated with different crop cultivars. The findings suggest that season-induced shifts in environmental conditions could exert stronger impacts on soil microorganisms than the finer-scale rhizosphere effect from crop cultivars, and consequently influence largely microbe-mediated soil processes and crop health in agricultural ecosystems.
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Affiliation(s)
- Umar Daraz
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Pastoral, Agriculture Science and Technology, Center for Grassland Microbiome, Lanzhou University, Lanzhou, China
| | | | - José C B Dubeux
- North Florida Research and Education Center, University of Florida, Marianna, FL, USA
| | - Cheryl Mackowiak
- North Florida Research and Education Center, University of Florida, Quincy, FL, USA
| | - Victor A Guerra
- North Florida Research and Education Center, University of Florida, Quincy, FL, USA
| | - Chih-Ming Hsu
- North Florida Research and Education Center, University of Florida, Quincy, FL, USA
| | - Jianguo Ma
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Pastoral, Agriculture Science and Technology, Center for Grassland Microbiome, Lanzhou University, Lanzhou, China
| | - Yuman Li
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Pastoral, Agriculture Science and Technology, Center for Grassland Microbiome, Lanzhou University, Lanzhou, China
| | - Xiaoqian Yang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Pastoral, Agriculture Science and Technology, Center for Grassland Microbiome, Lanzhou University, Lanzhou, China
| | - Hui-Ling Liao
- North Florida Research and Education Center, University of Florida, Quincy, FL, USA
| | - Xiao-Bo Wang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Pastoral, Agriculture Science and Technology, Center for Grassland Microbiome, Lanzhou University, Lanzhou, China.
- Erguna Forest-Steppe Ecotone Research Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
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Guerra VA, Beule L, Mackowiak CL, Dubeux JCB, Blount ARS, Wang XB, Rowland DL, Liao HL. Soil bacterial community response to rhizoma peanut incorporation into Florida pastures. J Environ Qual 2022; 51:55-65. [PMID: 34978336 DOI: 10.1002/jeq2.20307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Accepted: 10/14/2021] [Indexed: 06/14/2023]
Abstract
Incorporating legumes is one option for improving pasture fertility, sustainability, and biodiversity. Diazotrophic microorganisms, including rhizobia that form symbioses with legumes, represent a small fraction of the total soil microbial community. Yet, they can offset nitrogen (N) fertilizer inputs through their ability to convert atmospheric N2 into plant-usable N via biological N2 fixation (BNF). This study used amplicon sequencing of 16S rRNA genes to investigate soil bacterial community composition and diversity in grazed 'Argentine' bahiagrass (Paspalum notatum Flügge) pastures where N fertilizer was supplanted with legume-derived N from BNF in some treatments. Treatments consisted of bahiagrass fertilized with (a) mineral N (224 kg N ha-1 yr-1 ), (b) combination mineral N (34 kg N ha-1 yr-1 ) and legume-derived N via cool-season clover (CSC) (Trifolium spp.) mix, or (c) combination mineral N (34 kg N ha-1 yr-1 ) and legume-derived N via CSC mix and strips of Ecoturf rhizoma peanut (Arachis glabrata Benth.). Bradyrhizobium spp. relative abundance was 44% greater in the mixed pasture. Other bacterial genera with BNF or denitrification potentials were greater in pastures with legumes, whereas sequences assigned to genera associated with high litter turnover were greater in bahiagrass pastures receiving only mineral N. Soil bacteria alpha diversity was greater in pastures receiving 34 kg ha-1 yr-1 N fertilizer application and the CSC mix than in pastures with the CSC mix and rhizoma peanut strips. Our results demonstrate soil microbial community shifts that may affect soil C and N cycling in pastures common to the southeastern United States.
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Affiliation(s)
- Victor A Guerra
- North Florida Research and Education Center, Univ. of Florida, 155 Research Road, Quincy, FL, 32351, USA
| | - Lukas Beule
- Julius Kühn Institute (JKI)-Federal Research Centre for Cultivated Plants, Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection, Königin-Luise-Strasse 19, Berlin, 14195, Germany
| | - Cheryl L Mackowiak
- North Florida Research and Education Center, Univ. of Florida, 155 Research Road, Quincy, FL, 32351, USA
| | - Jose C B Dubeux
- North Florida Research and Education Center, Univ. of Florida, 3925 Highway 71, Marianna, FL, 32446, USA
| | - Ann R S Blount
- North Florida Research and Education Center, Univ. of Florida, 155 Research Road, Quincy, FL, 32351, USA
| | - Xiao-Bo Wang
- State Key Laboratory of Grassland Agroecosystems, Center for Grassland Microbiome, and College of Pastoral, Agriculture Science and Technology, Lanzhou Univ., Lanzhou, 730020, PR China
| | - Diane L Rowland
- Agronomy Dep., Univ. of Florida, Gainesville, FL, 32611, USA
- Current address: College of Natural Sciences Forestry, and Agriculture, Univ. of Maine, Orono, ME, 04469, USA
| | - Hui-Ling Liao
- North Florida Research and Education Center, Univ. of Florida, 155 Research Road, Quincy, FL, 32351, USA
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