1
|
Thompson JB, Döring TF, Bowles TM, Kolb S, Bellingrath-Kimura SD, Reckling M. Seasonal soil health dynamics in soy-wheat relay intercropping. Sci Rep 2024; 14:18989. [PMID: 39160252 PMCID: PMC11333471 DOI: 10.1038/s41598-024-69903-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 08/09/2024] [Indexed: 08/21/2024] Open
Abstract
There is growing interest in intercropping as a practice to increase productivity per unit area and ecosystem functioning in agricultural systems. Relay intercropping with soy and winter wheat may benefit soil health due to increased diversity and longer undisturbed soil cover, yet this remains largely unstudied. Using a field experiment in Eastern Germany, we studied the temporal dynamics of chemical, biological, and physical indicators of soil health in the topsoil over a year of cultivation to detect early effects of soy-wheat relay intercropping compared to sole cropping. Indicators included microbial abundance, permanganate-oxidizable carbon, carbon fractions, pH, and water infiltration. Relay intercropping showed no unique soil health benefits compared to sole cropping, likely affected by drought that stressed intercropped soy. Relay intercropping did, however, maintain several properties of both sole crops including an increased MAOM C:N ratio and higher soil water infiltration. The MAOM C:N ratio increased by 4.2 and 6.2% in intercropping and sole soy and decreased by 5% in sole wheat. Average near-saturated soil water infiltration rates were 12.6, 14.9, and 6.0 cm hr-1 for intercropping, sole wheat, and sole soy, respectively. Cropping system did not consistently affect other indicators but we found temporal patterns of these indicators, showing their sensitivity to external changes.
Collapse
Affiliation(s)
- Jennifer B Thompson
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Müncheberg, Germany.
- Faculty of Life Science, Thaer-Institute of Agricultural and Horticultural Science, Humboldt-University of Berlin, 14195, Berlin, Germany.
| | - Thomas F Döring
- Institute of Crop Science and Resource Conservation, Agroecology and Organic Farming, University of Bonn, 53121, Bonn, Germany
| | - Timothy M Bowles
- Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA
| | - Steffen Kolb
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Müncheberg, Germany
| | - Sonoko D Bellingrath-Kimura
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Müncheberg, Germany
- Faculty of Life Science, Thaer-Institute of Agricultural and Horticultural Science, Humboldt-University of Berlin, 14195, Berlin, Germany
| | - Moritz Reckling
- Leibniz Centre for Agricultural Landscape Research (ZALF), 15374, Müncheberg, Germany
- Department of Crop Production Ecology, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden
| |
Collapse
|
2
|
Dong Q, Su H, Sun Y, Zhao Y, Zhou D, Wang X, Jiang C, Liu X, Zhong C, Zhang H, Kang S, Zhao X, Yu H. Metagenomic insights into nitrogen cycling functional gene responses to nitrogen fixation and transfer in maize-peanut intercropping. PLANT, CELL & ENVIRONMENT 2024. [PMID: 39031093 DOI: 10.1111/pce.15034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 06/09/2024] [Accepted: 06/28/2024] [Indexed: 07/22/2024]
Abstract
The fixation and transfer of biological nitrogen from peanuts to maize in maize-peanut intercropping systems play a pivotal role in maintaining the soil nutrient balance. However, the mechanisms through which root interactions regulate biological nitrogen fixation and transfer remain unclear. This study employed a 15N isotope labelling method to quantify nitrogen fixation and transfer from peanuts to maize, concurrently elucidating key microorganisms and genera in the nitrogen cycle through metagenomic sequencing. The results revealed that biological nitrogen fixation in peanut was 50 mg and transfer to maize was 230 mg when the roots interacted. Moreover, root interactions significantly increased nitrogen content and the activities of protease, dehydrogenase (DHO) and nitrate reductase in the rhizosphere soil. Metagenomic analyses and structural equation modelling indicated that nrfC and nirA genes played important roles in regulating nitrogen fixation and transfer. Bradyrhizobium was affected by soil nitrogen content and DHO, indirectly influencing the efficiency of nitrogen fixation and transfer. Overall, our study identified key bacterial genera and genes associated with nitrogen fixation and transfer, thus advancing our understanding of interspecific interactions and highlighting the pivotal role of soil microorganisms and functional genes in maintaining soil ecosystem stability from a molecular ecological perspective.
Collapse
Affiliation(s)
- Qiqi Dong
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Huijie Su
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yuexin Sun
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yubiao Zhao
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Dongying Zhou
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaoguang Wang
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Chunji Jiang
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xibo Liu
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Chao Zhong
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - He Zhang
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Shuli Kang
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xinhua Zhao
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Haiqiu Yu
- Peanut Research Institute, College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
- School of Agriculture and Horticulture, Liaoning Agricultural Vocational and Technical College, Yingkou, Liaoning, China
| |
Collapse
|
3
|
Dang P, Lu C, Huang T, Zhang M, Yang N, Han X, Xu C, Wang S, Wan C, Qin X, Siddique KHM. Enhancing intercropping sustainability: Manipulating soybean rhizosphere microbiome through cropping patterns. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 931:172714. [PMID: 38679108 DOI: 10.1016/j.scitotenv.2024.172714] [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: 03/14/2024] [Revised: 04/20/2024] [Accepted: 04/21/2024] [Indexed: 05/01/2024]
Abstract
Understanding the responses of soybean rhizosphere and functional microbiomes in intercropping scenarios holds promise for optimizing nitrogen utilization in legume-based intercropping systems. This study investigated three cropping layouts under film mulching: sole soybean (S), soybean-maize intercropping in one row (IS), and soybean-maize intercropping in two rows (IIS), each subjected to two nitrogen levels: 110 kg N ha-1 (N110) and 180 kg N ha-1 (N180). Our findings reveal that cropping patterns alter bacterial and nifh communities, with approximately 5 % of soybean rhizosphere bacterial amplicon sequence variants (ASVs) and 42 % of rhizosphere nifh ASVs exhibiting altered abundances (termed sensitive ASVs). Root traits and soil properties shape these communities, with root traits exerting greater influence. Sensitive ASVs drive microbial co-occurrence networks and deterministic processes, predicting 85 % of yield variance and 78 % of partial factor productivity of nitrogen, respectively. These alterations impact bacterial and nifh diversity, complexity, stability, and deterministic processes in legume-based intercropping systems, enhancing performance in terms of yield, nitrogen utilization efficiency, land equivalent ratio, root nodule count, and nodule dry weight under IIS patterns with N110 compared to other treatments. Our findings underscore the importance of field management practices in shaping rhizosphere-sensitive ASVs, thereby altering microbial functions and ultimately impacting the productivity of legume-based intercropping systems. This mechanistic understanding of soybean rhizosphere microbial responses to intercropping patterns offers insights for sustainable intercropping enhancements through microbial manipulation.
Collapse
Affiliation(s)
- Pengfei Dang
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Chen Lu
- Yangling Vocational and Technical College, Yangling, Shaanxi, 712100, China
| | - Tiantian Huang
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Miaomiao Zhang
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Ning Yang
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xiaoqing Han
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Chunhong Xu
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Shiguang Wang
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Chenxi Wan
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xiaoliang Qin
- College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| | - Kadambot H M Siddique
- The UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6001, Australia
| |
Collapse
|
4
|
Li C, Lambers H, Jing J, Zhang C, Bezemer TM, Klironomos J, Cong WF, Zhang F. Belowground cascading biotic interactions trigger crop diversity benefits. TRENDS IN PLANT SCIENCE 2024:S1360-1385(24)00115-8. [PMID: 38821841 DOI: 10.1016/j.tplants.2024.04.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/21/2024] [Accepted: 04/30/2024] [Indexed: 06/02/2024]
Abstract
Crop diversification practices offer numerous synergistic benefits. So far, research has traditionally been confined to exploring isolated, unidirectional single-process interactions among plants, soil, and microorganisms. Here, we present a novel and systematic perspective, unveiling the intricate web of plant-soil-microbiome interactions that trigger cascading effects. Applying the principles of cascading interactions can be an alternative way to overcome soil obstacles such as soil compaction and soil pathogen pressure. Finally, we introduce a research framework comprising the design of diversified cropping systems by including commercial varieties and crops with resource-efficient traits, the exploration of cascading effects, and the innovation of field management. We propose that this provides theoretical and methodological insights that can reveal new mechanisms by which crop diversity increases productivity.
Collapse
Affiliation(s)
- Chunjie Li
- State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - Hans Lambers
- State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; School of Biological Sciences and Institute of Agriculture, The University of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia
| | - Jingying Jing
- College of Grassland Science and Technology, China Agricultural University, 100193 Beijing, China
| | - Chaochun Zhang
- State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| | - T Martijn Bezemer
- Institute of Biology, Leiden University, 2333, BE, Leiden, The Netherlands
| | - John Klironomos
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, PO Box 26666, Sharjah, United Arab Emirates
| | - Wen-Feng Cong
- State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
| | - Fusuo Zhang
- State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
| |
Collapse
|
5
|
Wang X, Chi Y, Song S. Important soil microbiota's effects on plants and soils: a comprehensive 30-year systematic literature review. Front Microbiol 2024; 15:1347745. [PMID: 38591030 PMCID: PMC10999704 DOI: 10.3389/fmicb.2024.1347745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 03/11/2024] [Indexed: 04/10/2024] Open
Abstract
Clarifying the relationship between soil microorganisms and the plant-soil system is crucial for encouraging the sustainable development of ecosystems, as soil microorganisms serve a variety of functional roles in the plant-soil system. In this work, the influence mechanisms of significant soil microbial groups on the plant-soil system and their applications in environmental remediation over the previous 30 years were reviewed using a systematic literature review (SLR) methodology. The findings demonstrated that: (1) There has been a general upward trend in the number of publications on significant microorganisms, including bacteria, fungi, and archaea. (2) Bacteria and fungi influence soil development and plant growth through organic matter decomposition, nitrogen, phosphorus, and potassium element dissolution, symbiotic relationships, plant growth hormone production, pathogen inhibition, and plant resistance induction. Archaea aid in the growth of plants by breaking down low-molecular-weight organic matter, participating in element cycles, producing plant growth hormones, and suppressing infections. (3) Microorganism principles are utilized in soil remediation, biofertilizer production, denitrification, and phosphorus removal, effectively reducing environmental pollution, preventing soil pathogen invasion, protecting vegetation health, and promoting plant growth. The three important microbial groups collectively regulate the plant-soil ecosystem and help maintain its relative stability. This work systematically summarizes the principles of important microbial groups influence plant-soil systems, providing a theoretical reference for how to control soil microbes in order to restore damaged ecosystems and enhance ecosystem resilience in the future.
Collapse
Affiliation(s)
| | - Yongkuan Chi
- School of Karst Science, State Engineering Technology Institute for Karst Desertification Control, Guizhou Normal University, Guiyang, China
| | | |
Collapse
|
6
|
Yu T, Hou X, Fang X, Razavi B, Zang H, Zeng Z, Yang Y. Short-term continuous monocropping reduces peanut yield mainly via altering soil enzyme activity and fungal community. ENVIRONMENTAL RESEARCH 2024; 245:117977. [PMID: 38141923 DOI: 10.1016/j.envres.2023.117977] [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: 10/09/2023] [Revised: 12/12/2023] [Accepted: 12/16/2023] [Indexed: 12/25/2023]
Abstract
Continuous monocropping can lead to soil sickness and increase of soil-borne disease, which finally reduces crop yield. Microorganisms benefit plants by increasing nutrient availability, participating in auxin synthesis, and defending against pathogens. However, little is known about the influence of short-term successive peanuts cropping on soil properties, enzyme activities, its yield, plant-associated microbes, and their potential correlations in peanut production. Here, we examined the community structure, composition, network structure and function of microbes in the rhizosphere and bulk soils under different monocropping years. Moreover, we assessed the impact of changes in the soil micro-environment and associated soil microbes on peanut yield. Our results showed that increase of monocropping year significantly decreased most soil properties, enzyme activities and peanut yield (p < 0.05). Principal co-ordinates analysis (PCoA) and analysis of similarities (ANOSIM) indicated that monocropping year significantly influenced the fungal community structure in the rhizosphere and bulk soils (p < 0.01), while had no effect on the bacterial community. With the increase of continuous monocropping year, peanut selectively decreased (e.g., Candidatus_Entotheonella, Bacillus and Bryobacter) or increased (e.g., Nitrospira, Nocardioides, Ensifer, Gaiella, and Novosphingobium) the abundance of some beneficial bacterial genera in the rhizosphere. Continuous monocropping significantly increased the abundance of plant pathogens (e.g., Plectosphaerella, Colletotrichum, Lectera, Gibberella, Metarhizium, and Microdochium) in the rhizosphere and negatively affected the balance of fungal community. Besides, these species were correlated negatively with L-leucine aminopeptidase (LAP) activity. Network co-occurrence analysis showed that continuous monocropping simplified the interaction network of bacteria and fungi. Random forest and partial least squares path modeling (PLS-PM) analysis further showed that fungal community, pathogen abundance, soil pH, and LAP activity negatively affected peanut yield. In conclusion, short-term continuous monocropping decreased LAP activity and increased potential fungal pathogens abundance, leading to reduction of peanut yield.
Collapse
Affiliation(s)
- Taobing Yu
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Xiqing Hou
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Xiangyang Fang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Bahar Razavi
- Department of Soil-Plant-Microbiome, Institute of Phytopathology, University of Kiel, Germany
| | - Huadong Zang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Zhaohai Zeng
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China
| | - Yadong Yang
- College of Agronomy and Biotechnology, China Agricultural University, Beijing, 100193, China.
| |
Collapse
|
7
|
Wang N, Wang T, Chen Y, Wang M, Lu Q, Wang K, Dou Z, Chi Z, Qiu W, Dai J, Niu L, Cui J, Wei Z, Zhang F, Kümmerli R, Zuo Y. Microbiome convergence enables siderophore-secreting-rhizobacteria to improve iron nutrition and yield of peanut intercropped with maize. Nat Commun 2024; 15:839. [PMID: 38287073 PMCID: PMC10825131 DOI: 10.1038/s41467-024-45207-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Accepted: 01/17/2024] [Indexed: 01/31/2024] Open
Abstract
Intercropping has the potential to improve plant nutrition as well as crop yield. However, the exact mechanism promoting improved nutrient acquisition and the role the rhizosphere microbiome may play in this process remains poorly understood. Here, we use a peanut/maize intercropping system to investigate the role of root-associated microbiota in iron nutrition in these crops, combining microbiome profiling, strain and substance isolation and functional validation. We find that intercropping increases iron nutrition in peanut but not in maize plants and that the microbiota composition changes and converges between the two plants tested in intercropping experiments. We identify a Pseudomonas secreted siderophore, pyoverdine, that improves iron nutrition in glasshouse and field experiments. Our results suggest that the presence of siderophore-secreting Pseudomonas in peanut and maize intercropped plays an important role in iron nutrition. These findings could be used to envision future intercropping practices aiming to improve plant nutrition.
Collapse
Affiliation(s)
- Nanqi Wang
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Tianqi Wang
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Yu Chen
- Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Jiangsu Province Engineering Research Center of Eco-cultivation and High-value Utilization of Chinese Medicinal Materials, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, 210014, Nanjing, Jiangsu, China
| | - Ming Wang
- Department of Plant Pathology, The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Qiaofang Lu
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Kunguang Wang
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Zhechao Dou
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Zhiguang Chi
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Wei Qiu
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Jing Dai
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Lei Niu
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Jianyu Cui
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Zhong Wei
- Jiangsu provincial key lab for solid organic waste utilization, Key lab of organic-based fertilizers of China, Jiangsu Collaborative Innovation Center for Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Fusuo Zhang
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China
| | - Rolf Kümmerli
- Department of Quantitative Biomedicine, University of Zurich, Zurich, Switzerland
| | - Yuanmei Zuo
- College of Resources and Environmental Sciences, State Key Laboratory of Nutrient Use and Management (SKL-NUM), National Academy of Agriculture Green Development, China Agricultural University, 100193, Beijing, China.
| |
Collapse
|
8
|
Zhang T, Tang H, Peng P, Ge S, Liu Y, Feng Y, Wang J. Sugarcane/soybean intercropping with reduced nitrogen addition promotes photosynthesized carbon sequestration in the soil. FRONTIERS IN PLANT SCIENCE 2023; 14:1282083. [PMID: 38107008 PMCID: PMC10722189 DOI: 10.3389/fpls.2023.1282083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 09/25/2023] [Indexed: 12/19/2023]
Abstract
Introduction Sugarcane/soybean intercropping with reduced nitrogen (N) addition has improved soil fertility and sustainable agricultural development in China. However, the effects of intercropping pattern and N fertilizer addition on the allocation of photosynthesized carbon (C) in plant-soil system were far less understood. Methods In this study, we performed an 13CO2 pulse labeling experiment to trace C footprints in plant-soil system under different cropping patterns [sugarcane monoculture (MS), sugarcane/soybean intercropping (SB)] and N addition levels [reduced N addition (N1) and conventional N addition (N2)]. Results and discussion Our results showed that compared to sugarcane monoculture, sugarcane/soybean intercropping with N reduced addition increased sugarcane biomass and root/shoot ratio, which in turn led to 23.48% increase in total root biomass. The higher root biomass facilitated the flow of shoot fixed 13C to the soil in the form of rhizodeposits. More than 40% of the retained 13C in the soil was incorporated into the labile C pool [microbial biomass C (MBC) and dissolved organic C (DOC)] on day 1 after labeling. On day 27 after labeling, sugarcane/soybean intercropping with N reduced addition showed the highest 13C content in the MBC as well as in the soil, 1.89 and 1.14 times higher than the sugarcane monoculture, respectively. Moreover, intercropping pattern increased the content of labile C and labile N (alkaline N, ammonium N and nitrate N) in the soil. The structural equation model indicated that the cropping pattern regulated 13C sequestration in the soil mainly by driving changes in labile C, labile N content and root biomass in the soil. Our findings demonstrate that sugarcane/soybean intercropping with reduced N addition increases photosynthesized C sequestration in the soil, enhances the C sink capacity of agroecosystems.
Collapse
Affiliation(s)
- Tantan Zhang
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Hu Tang
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Peng Peng
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Shiqiang Ge
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Yali Liu
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Yuanjiao Feng
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| | - Jianwu Wang
- Key Laboratory of Agro-Environments in Tropics, Ministry of Agriculture and Rural Affairs, South China Agriculture University, Guangzhou, China
- Guangdong Provincial Key Laboratory of Eco-Circular Agriculture, South China Agriculture University, Guangzhou, China
- Department of Ecology, College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
| |
Collapse
|
9
|
Zhao L, Fu G, Zeng A, Cheng B, Song Z, Hu Z. Effects of different aeration strategies and ammonia-nitrogen loads on nitrification performance and microbial community succession of mangrove constructed wetlands for saline wastewater treatment. CHEMOSPHERE 2023; 339:139685. [PMID: 37532202 DOI: 10.1016/j.chemosphere.2023.139685] [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: 02/18/2023] [Revised: 07/25/2023] [Accepted: 07/29/2023] [Indexed: 08/04/2023]
Abstract
In highly salinized environments, nitrification is the process that limits the rate of nitrogen transformation and removal. Therefore, this study concentrated on the impacts of different aeration strategies and NH4+-N loads on the nitrification performance of mangrove constructed wetlands (CWs), as well as investigating the succession mechanism of ammonia-oxidizing microorganisms (AOMs). The results showed that both the CW with continuous aeration (CA-CW) and intermittent aeration (IA-CW) achieved a nitrification efficiency of more than 98% under an NH4+-N loading of 1.25-4.7 g/(m2·d). However, the total nitrogen removal rates of IA-CW under low and high ammonia-nitrogen loads (LAL, 20.09 ± 4.4% and HAL, 8.77 ± 1.35%, respectively) were higher than those of CA-CW (16.11 ± 4.7% and 3.32 ± 2.3%, respectively), especially under HAL (p < 0.05). Pearson correlation analysis showed that under different operating conditions, the differential secretion of Kandelia candel rhizosphere organic matter had a certain regulatory effect on nitrification and denitrification groups such as Candidatus Nitrocosmicus, Nitrancea, Truepera, Pontibacter, Halomonas, and Sulfurovum in the wetland root layer. The quantitative polymerase chain reaction revealed that the NH4+-N load rate was the primary factor driving the succession of the AOMs, with different aeration strategies exacerbating this process. Overall, this study revealed that the dominant AOMs in mangrove CWs could be significantly altered by regulating the aeration modes and pollution loads to adjust the rhizosphere organic matter in situ, thereby resulting in more efficient nitrification.
Collapse
Affiliation(s)
- Lin Zhao
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China; Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Longhua Innovation Institute for Biotechnology, Shenzhen University, Shenzhen, 518055, China; Anhui Province Key Laboratory of Environmental Hormone and Reproduction, College of Biology and Food engineering, Fuyang Normal University, Fuyang, 236037, China.
| | - Guiping Fu
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China.
| | - Anzu Zeng
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China
| | - Bingzhen Cheng
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China
| | - Zihao Song
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China
| | - Zhangli Hu
- Guangdong Technology Research Center for Marine Algal Bioengineering, Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen, 518060, China; Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Longhua Innovation Institute for Biotechnology, Shenzhen University, Shenzhen, 518055, China.
| |
Collapse
|
10
|
Islam T, Fatema, Hoque MN, Gupta DR, Mahmud NU, Sakif TI, Sharpe AG. Improvement of growth, yield and associated bacteriome of rice by the application of probiotic Paraburkholderia and Delftia. Front Microbiol 2023; 14:1212505. [PMID: 37520368 PMCID: PMC10375411 DOI: 10.3389/fmicb.2023.1212505] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 06/28/2023] [Indexed: 08/01/2023] Open
Abstract
Plant probiotic bacteria enhance growth and yield of crop plants when applied at the appropriate time and dose. Two rice probiotic bacteria, Paraburkholderia fungorum strain BRRh-4 and Delftia sp. strain BTL-M2 promote growth and yield of plants. However, no information is available on application of these two bacteria on growth, yield, and diversity and population of bacteriome in roots and rhizosphere soils of the treated rice plants. This study aimed to assess the effect of BRRh-4 and BTL-M2 application on growth, yield and bacteriome in roots and rhizosphere soil of rice under varying doses of N, P and K fertilizers. Application of BRRh-4 and BTL-M2 strains significantly (p < 0.05) increased seed germination, growth and yield of rice compared to an untreated control. Interestingly, the grain yield of rice by these bacteria with 50% less of the recommended doses of N, P, and K fertilizers were statistically similar to or better than the rice plants treated with 100% doses of these fertilizers. Targeted amplicon (16S rRNA) sequence-based analysis revealed significant differences (PERMANOVA, p = 0.00035) in alpha-diversity between the root (R) and rhizosphere soil (S) samples, showing higher diversity in the microbial ecosystem of root samples. Additionally, the bacteriome diversity in the root of rice plants that received both probiotic bacteria and chemical fertilizers were significantly higher (PERMANOVA, p = 0.0312) compared to the rice plants treated with fertilizers only. Out of 185 bacterial genera detected, Prevotella, an anaerobic and Gram-negative bacterium, was found to be the predominant genus in both rhizosphere soil and root metagenomes. However, the relative abundance of Prevotella remained two-fold higher in the rhizosphere soil metagenome (52.02%) than in the root metagenome (25.04%). The other predominant bacterial genera detected in the rice root metagenome were Bacillus (11.07%), Planctomyces (4.06%), Faecalibacterium (3.91%), Deinococcus (2.97%), Bacteroides (2.61%), and Chryseobacterium (2.30%). On the other hand, rhizosphere soil metagenome had Bacteroides (12.38%), Faecalibacterium (9.50%), Vibrio (5.94%), Roseomonas (3.40%), and Delftia (3.02%). Interestingly, we found the presence and/or abundance of specific genera of bacteria in rice associated with the application of a specific probiotic bacterium. Taken together, our results indicate that improvement of growth and yield of rice by P. fungorum strain BRRh-4 and Delftia sp. strain BTL-M2 is likely linked with modulation of diversity, structures, and signature of bacteriome in roots and rhizosphere soils. This study for the first time demonstrated that application of plant growth promoting bacteria significantly improve growth, yield and increase the diversity of bacterial community in rice.
Collapse
Affiliation(s)
- Tofazzal Islam
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh
| | - Fatema
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh
| | - M. Nazmul Hoque
- Department of Gynecology, Obstetrics and Reproductive Health, BSMRAU, Gazipur, Bangladesh
| | - Dipali Rani Gupta
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh
| | - Nur Uddin Mahmud
- Institute of Biotechnology and Genetic Engineering (IBGE), Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Gazipur, Bangladesh
| | - Tahsin Islam Sakif
- Lane Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown, WV, United States
| | - Andrew G. Sharpe
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, SK, Canada
| |
Collapse
|
11
|
Ebbisa A. Mechanisms underlying cereal/legume intercropping as nature-based biofortification: A review. FOOD PRODUCTION, PROCESSING AND NUTRITION 2022. [DOI: 10.1186/s43014-022-00096-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
AbstractThe deficiencies of micronutrients known as hidden hunger are severely affecting more than one-half of the world’s population, which is highly related to low bioavailability of micronutrients, poor quality diets, and consumption of cereal-based foods in developing countries. Although numerous experiments proved biofortification as a paramount approach for improving hidden hunger around the world, its effectiveness is highly related to various soil factors, climate conditions, and the adoption rates of biofortified crops. Furthermore, agronomic biofortification may result in the sedimentation of heavy metals in the soil that pose another detrimental effect on plants and human health. In response to these challenges, several studies suggested intercropping as one of the feasible, eco-friendly, low-cost, and short-term approaches for improving the nutritional quality and yield of crops sustainable way. Besides, it is the cornerstone of climate-smart agriculture and the holistic solution for the most vulnerable area to solve malnutrition that disturbs human healthy catastrophically. Nevertheless, there is meager information on mechanisms and processes related to soil-plant interspecific interactions that lead to an increment of nutrients bioavailability to tackle the crisis of micronutrient deficiency in a nature-based solution. In this regard, this review tempted to (1) explore mechanisms and processes that can favor the bioavailability of Zn, Fe, P, etc. in soil and edible parts of crops, (2) synthesize available information on the benefits and synergic role of the intercropping system in food and nutritional security, and (3) outline the bottlenecks influencing the effectiveness of biofortification for promoting sustainable agriculture in sub-Saharan Africa (SSA). Based on this review SSA countries are malnourished due to limited access to diverse diets, supplementation, and commercially fortified food; hence, I suggest integrated research by agronomists, plant nutritionists, and agroecologist to intensify and utilize intercropping systems as biofortification sustainably alleviating micronutrient deficiencies.
Graphical Abstract
Collapse
|
12
|
Li Y, He X, Yuan H, Lv G. Differed Growth Stage Dynamics of Root-Associated Bacterial and Fungal Community Structure Associated with Halophytic Plant Lycium ruthenicum. Microorganisms 2022; 10:microorganisms10081644. [PMID: 36014066 PMCID: PMC9414475 DOI: 10.3390/microorganisms10081644] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/12/2022] [Accepted: 08/12/2022] [Indexed: 01/02/2023] Open
Abstract
Lycium ruthenicum, a halophytic shrub, has been used to remediate saline soils in northwest China. However, little is known about its root-associated microbial community and how it may be affected by the plant’s growth cycle. In this study, we investigate the microbial community structure of L. ruthenicum by examining three root compartments (rhizosphere, rhizoplane, and endosphere) during four growth stages (vegetative, flowering, fruiting, and senescence). The microbial community diversity and composition were determined by Illumina MiSeq sequencing of the 16S V3–V4 and 18S ITS regions. Proteobacteria, Actinobacteria, Bacteroidetes, Planctomycetes, and Acidobacteria were the dominant bacterial phyla, while Ascomycota, Basidiomycota, and Mortierellomycota were the most dominant fungal phyla. The alpha diversity of the bacterial communities was highest in the rhizosphere and decreased from the rhizosphere to the endosphere compartments; the fungal communities did not show a consistent trend. The rhizosphere, rhizoplane, and endosphere had distinct bacterial community structures among the three root compartments and from the bulk soil. Additionally, PERMANOVA indicated that the effect of rhizocompartments explained a large proportion of the total community variation. Differential and biomarker analysis not only revealed that each compartment had unique biomarkers and was enriched for specific bacteria, but also that the biomarkers changed with the plant growth cycle. Fungi were also affected by the rhizocompartment, but to a much less so than bacteria, with significant differences in the community composition along the root compartments observed only during the vegetative and flowering stages. Instead, the growth stages appear to account for most of the fungal community variation as demonstrated by PCoA and NMDS, and supported by differential and biomarker analysis, which revealed that the fungal community composition in the rhizosphere and endosphere were dynamic in response to the growth stage. Many enriched OTUs or biomarkers that were identified in the root compartments were potentially beneficial to the plant, meanwhile, some harmful OTUs were excluded from the root, implying that the host plant can select for beneficial bacteria and fungi, which can promote plant growth or increase salt tolerance. In conclusion, the root compartment and growth stage were both determinant factors in structuring the microbial communities of L. ruthenicum, but the effects were different in bacteria and fungi, suggesting that bacterial and fungal community structures respond differently to these growth factors.
Collapse
Affiliation(s)
- Yan Li
- College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi 830046, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi 830046, China
| | - Xuemin He
- College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi 830046, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi 830046, China
| | - Hongfei Yuan
- College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
| | - Guanghui Lv
- College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
- Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi 830046, China
- Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi 830046, China
- Correspondence:
| |
Collapse
|
13
|
Dong Q, Zhao X, Zhou D, Liu Z, Shi X, Yuan Y, Jia P, Liu Y, Song P, Wang X, Jiang C, Liu X, Zhang H, Zhong C, Guo F, Wan S, Yu H, Zhang Z. Maize and peanut intercropping improves the nitrogen accumulation and yield per plant of maize by promoting the secretion of flavonoids and abundance of Bradyrhizobium in rhizosphere. FRONTIERS IN PLANT SCIENCE 2022; 13:957336. [PMID: 35991432 PMCID: PMC9386453 DOI: 10.3389/fpls.2022.957336] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/14/2022] [Indexed: 06/15/2023]
Abstract
Belowground interactions mediated by root exudates are critical for the productivity and efficiency of intercropping systems. Herein, we investigated the process of microbial community assembly in maize, peanuts, and shared rhizosphere soil as well as their regulatory mechanisms on root exudates under different planting patterns by combining metabolomic and metagenomic analyses. The results showed that the yield of intercropped maize increased significantly by 21.05% (2020) and 52.81% (2021), while the yield of intercropped peanut significantly decreased by 39.51% (2020) and 32.58% (2021). The nitrogen accumulation was significantly higher in the roots of the intercropped maize than in those of sole maize at 120 days after sowing, it increased by 129.16% (2020) and 151.93% (2021), respectively. The stems and leaves of intercropped peanut significantly decreased by 5.13 and 22.23% (2020) and 14.45 and 24.54% (2021), respectively. The root interaction had a significant effect on the content of ammonium nitrogen (NH4 +-N) as well as the activities of urease (UE), nitrate reductase (NR), protease (Pro), and dehydrogenase (DHO) in the rhizosphere soil. A combined network analysis showed that the content of NH4 +-N as well as the enzyme activities of UE, NR and Pro increased in the rhizosphere soil, resulting in cyanidin 3-sambubioside 5-glucoside and cyanidin 3-O-(6-Op-coumaroyl) glucoside-5-O-glucoside; shisonin were significantly up-regulated in the shared soil of intercropped maize and peanut, reshaped the bacterial community composition, and increased the relative abundance of Bradyrhizobium. These results indicate that interspecific root interactions improved the soil microenvironment, regulated the absorption and utilization of nitrogen nutrients, and provided a theoretical basis for high yield and sustainable development in the intercropping of maize and peanut.
Collapse
Affiliation(s)
- Qiqi Dong
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xinhua Zhao
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Dongying Zhou
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Zhenhua Liu
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaolong Shi
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yang Yuan
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Peiyan Jia
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Yingyan Liu
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Penghao Song
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xiaoguang Wang
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Chunji Jiang
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Xibo Liu
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - He Zhang
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Chao Zhong
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Feng Guo
- Shandong Academy of Agricultural Sciences, Jinan, Shandong, China
| | - Shubo Wan
- Shandong Academy of Agricultural Sciences, Jinan, Shandong, China
| | - Haiqiu Yu
- College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Zheng Zhang
- Shandong Academy of Agricultural Sciences, Jinan, Shandong, China
| |
Collapse
|
14
|
Zeng Q, Ding X, Wang J, Han X, Iqbal HMN, Bilal M. Insight into soil nitrogen and phosphorus availability and agricultural sustainability by plant growth-promoting rhizobacteria. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:45089-45106. [PMID: 35474421 DOI: 10.1007/s11356-022-20399-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 04/19/2022] [Indexed: 02/08/2023]
Abstract
Nitrogen and phosphorus are critical for the vegetation ecosystem and two of the most insufficient nutrients in the soil. In agriculture practice, many chemical fertilizers are being applied to soil to improve soil nutrients and yield. This farming procedure poses considerable environmental risks which affect agricultural sustainability. As robust soil microorganisms, plant growth-promoting rhizobacteria (PGPR) have emerged as an environmentally friendly way of maintaining and improving the soil's available nitrogen and phosphorus. As a special PGPR, rhizospheric diazotrophs can fix nitrogen in the rhizosphere and promote plant growth. However, the mechanisms and influences of rhizospheric nitrogen fixation (NF) are not well researched as symbiotic NF lacks summarizing. Phosphate-solubilizing bacteria (PSB) are important members of PGPR. They can dissolve both insoluble mineral and organic phosphate in soil and enhance the phosphorus uptake of plants. The application of PSB can significantly increase plant biomass and yield. Co-inoculating PSB with other PGPR shows better performance in plant growth promotion, and the mechanisms are more complicated. Here, we provide a comprehensive review of rhizospheric NF and phosphate solubilization by PGPR. Deeper genetic insights would provide a better understanding of the NF mechanisms of PGPR, and co-inoculation with rhizospheric diazotrophs and PSB strains would be a strategy in enhancing the sustainability of soil nutrients.
Collapse
Affiliation(s)
- Qingwei Zeng
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
| | - Xiaolei Ding
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing, 210037, China
| | - Jiangchuan Wang
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China
| | - Xuejiao Han
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China
| | - Hafiz M N Iqbal
- Tecnologico de Monterrey, School of Engineering and Sciences, 64849, Monterrey, Mexico
| | - Muhammad Bilal
- School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China
| |
Collapse
|
15
|
González D, Robas M, Fernández V, Bárcena M, Probanza A, Jiménez PA. Comparative Metagenomic Study of Rhizospheric and Bulk Mercury-Contaminated Soils in the Mining District of Almadén. Front Microbiol 2022; 13:797444. [PMID: 35330761 PMCID: PMC8940170 DOI: 10.3389/fmicb.2022.797444] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/17/2022] [Indexed: 12/22/2022] Open
Abstract
Soil contamination by heavy metals, particularly mercury (Hg), is a problem that can seriously affect the environment, animals, and human health. Hg has the capacity to biomagnify in the food chain. That fact can lead to pathologies, of those which affect the central nervous system being the most severe. It is convenient to know the biological environmental indicators that alert of the effects of Hg contamination as well as the biological mechanisms that can help in its remediation. To contribute to this knowledge, this study conducted comparative analysis by the use of Shotgun metagenomics of the microbial communities in rhizospheric soils and bulk soil of the mining region of Almadén (Ciudad Real, Spain), one of the most affected areas by Hg in the world The sequences obtained was analyzed with MetaPhlAn2 tool and SUPER-FOCUS. The most abundant taxa in the taxonomic analysis in bulk soil were those of Actinobateria and Alphaproteobacteria. On the contrary, in the rhizospheric soil microorganisms belonging to the phylum Proteobacteria were abundant, evidencing that roots have a selective effect on the rhizospheric communities. In order to analyze possible indicators of biological contamination, a functional potential analysis was performed. The results point to a co-selection of the mechanisms of resistance to Hg and the mechanisms of resistance to antibiotics or other toxic compounds in environments contaminated by Hg. Likewise, the finding of antibiotic resistance mechanisms typical of the human clinic, such as resistance to beta-lactams and glycopeptics (vancomycin), suggests that these environments can behave as reservoirs. The sequences involved in Hg resistance (operon mer and efflux pumps) have a similar abundance in both soil types. However, the response to abiotic stress (salinity, desiccation, and contaminants) is more prevalent in rhizospheric soil. Finally, sequences involved in nitrogen fixation and metabolism and plant growth promotion (PGP genes) were identified, with higher relative abundances in rhizospheric soils. These findings can be the starting point for the targeted search for microorganisms suitable for further use in bioremediation processes in Hg-contaminated environments.
Collapse
Affiliation(s)
- Daniel González
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Marina Robas
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Vanesa Fernández
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Marta Bárcena
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Agustín Probanza
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| | - Pedro A Jiménez
- Department of Pharmaceutical Science and Health, CEU Universities, Boadilla del Monte, Spain
| |
Collapse
|