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Bahadur A, Jiang S, Zhang W, Sajjad W, Usman M, Nasir F, Amir Zia M, Zhang Q, Pan J, Liu Y, Chen T, Feng H. Competitive interactions in two different plant species: Do grassland mycorrhizal communities and nitrogen addition play the same game? FRONTIERS IN PLANT SCIENCE 2023; 14:1084218. [PMID: 36993846 PMCID: PMC10040756 DOI: 10.3389/fpls.2023.1084218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Accepted: 02/28/2023] [Indexed: 06/19/2023]
Abstract
In the Tibetan Plateau grassland ecosystems, nitrogen (N) availability is rising dramatically; however, the influence of higher N on the arbuscular mycorrhizal fungi (AMF) might impact on plant competitive interactions. Therefore, understanding the part played by AMF in the competition between Vicia faba and Brassica napus and its dependence on the N-addition status is necessary. To address this, a glasshouse experiment was conducted to examine whether the grassland AMF community's inocula (AMF and NAMF) and N-addition levels (N-0 and N-15) alter plant competition between V. faba and B. napus. Two harvests took day 45 (1st harvest) and day 90 (2nd harvest), respectively. The findings showed that compared to B. napus, AMF inoculation significantly improved the competitive potential of the V. faba. In the occurrence of AMF, V. faba was the strongest competitor being facilitated by B. napus in both harvests. While under N-15, AMF significantly enhanced tissue N:P ratio in B. napus mixed-culture at 1st harvest, the opposite trend was observed in 2nd harvest. The mycorrhizal growth dependency slightly negatively affected mixed-culture compared to monoculture under both N-addition treatments. The aggressivity index of AMF plants was higher than NAMF plants with both N-addition and harvests. Our observation highlights that mycorrhizal associations might facilitate host plant species in mixed-culture with non-host plant species. Additionally, interacting with N-addition, AMF could impact the competitive ability of the host plant not only directly but also indirectly, thereby changing the growth and nutrient uptake of competing plant species.
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Affiliation(s)
- Ali Bahadur
- Key Laboratory of Extreme Environmental Microbial Resources and Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
- MOE Key Laboratory of Cell Activities and Stress Adaptation, School of Life Sciences, Lanzhou University, Lanzhou, China
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
| | - Shengjing Jiang
- State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China
| | - Wei Zhang
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
| | - Wasim Sajjad
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
| | - Muhammad Usman
- State Key Laboratory of Grassland Agroecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu, China
| | - Fahad Nasir
- Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, Jilin, China
| | - Muhammad Amir Zia
- National Institute for Genomics and Advanced Biotechnology, National Agriculture Research Center, Islamabad, Pakistan
| | - Qi Zhang
- MOE Key Laboratory of Cell Activities and Stress Adaptation, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Jianbin Pan
- MOE Key Laboratory of Cell Activities and Stress Adaptation, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Yongjun Liu
- MOE Key Laboratory of Cell Activities and Stress Adaptation, School of Life Sciences, Lanzhou University, Lanzhou, China
| | - Tuo Chen
- State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China
| | - Huyuan Feng
- MOE Key Laboratory of Cell Activities and Stress Adaptation, School of Life Sciences, Lanzhou University, Lanzhou, China
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Reay MK, Pears KA, Kuhl A, Evershed RP, Murray PJ, Cardenas LM, Dungait JAJ, Bull ID. Mechanisms of nitrogen transfer in a model clover-ryegrass pasture: a 15N-tracer approach. PLANT AND SOIL 2022; 480:369-389. [PMID: 36466744 PMCID: PMC9705487 DOI: 10.1007/s11104-022-05585-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 06/25/2022] [Indexed: 06/17/2023]
Abstract
PURPOSE Nitrogen (N) transfer from white clover (Trifolium repens cv.) to ryegrass (Lolium perenne cv.) has the potential to meet ryegrass N requirements. This study aimed to quantify N transfer in a mixed pasture and investigate the influence of the microbial community and land management on N transfer. METHODS Split root 15N-labelling of clover quantified N transfer to ryegrass via exudation, microbial assimilation, decomposition, defoliation and soil biota. Incorporation into the microbial protein pool was determined using compound-specific 15N-stable isotope probing approaches. RESULTS N transfer to ryegrass and soil microbial protein in the model system was relatively small, with one-third arising from root exudation. N transfer to ryegrass increased with no microbial competition but soil microbes also increased N transfer via shoot decomposition. Addition of mycorrhizal fungi did not alter N transfer, due to the source-sink nature of this pathway, whilst weevil grazing on roots decreased microbial N transfer. N transfer was bidirectional, and comparable on a short-term scale. CONCLUSIONS N transfer was low in a model young pasture established from soil from a permanent grassland with long-term N fertilisation. Root exudation and decomposition were major N transfer pathways. N transfer was influenced by soil biota (weevils, mycorrhizae) and land management (e.g. grazing). Previous land management and the role of the microbial community in N transfer must be considered when determining the potential for N transfer to ryegrass. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s11104-022-05585-0.
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Affiliation(s)
- Michaela K. Reay
- Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS UK
| | - Katrina A. Pears
- Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS UK
| | - Alison Kuhl
- Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS UK
| | - Richard P. Evershed
- Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS UK
| | - Phillip J. Murray
- Department of Sustainable Agriculture Sciences, Rothamsted Research - North Wyke, Okehampton, EX20 2SB Devon UK
- Present Address: School of Agriculture, Food and Environment, Royal Agricultural University, Cirencester, GL7 6JS UK
| | - Laura M. Cardenas
- Department of Sustainable Agriculture Sciences, Rothamsted Research - North Wyke, Okehampton, EX20 2SB Devon UK
| | - Jennifer A. J. Dungait
- Department of Sustainable Agriculture Sciences, Rothamsted Research - North Wyke, Okehampton, EX20 2SB Devon UK
- Present Address: Carbon Management Center, SRUC - Scotland’s Rural College, Edinburgh, Scotland EH9 3JG UK
- Present Address: Geography, CLES - Amory Building, University of Exeter, Exeter, EX4 4RJ UK
| | - Ian D. Bull
- Organic Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS UK
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Yang M, Shi Z, Mickan BS, Zhang M, Cao L. Alterations to arbuscular mycorrhizal fungal community composition is driven by warming at specific elevations. PeerJ 2021; 9:e11792. [PMID: 34327058 PMCID: PMC8310619 DOI: 10.7717/peerj.11792] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 06/25/2021] [Indexed: 11/20/2022] Open
Abstract
Background Global warming can alter plant productivity, and community composition which has consequences for soil-plant associated microorganisms. Arbuscular mycorrhizal fungi (AMF) are distributed widely and form symbiotic relationships with more than 80% of vascular plants and play a key role in nutrient cycling processes at the ecosystem scale. Methods A simulated warming experiment at multiple elevations (3,000, 3,500, 3,800, and 4,170 m) was conducted utilizing an in-situ open-top chamber (OTC) for exploring the effect of global warming on AMF community structure in the Qinghai-Tibet Plateau (QTP). This region has been identified as one of the most sensitive areas to climatic changes. Soil DNA was extracted and sequenced using next the Mi-Seq platform for diversity profiling. Results AMF richness was higher under the simulated warming chamber, however this only occurred in the elevation of 3,500 m. Warming did not alter other AMF alpha diversity indices (e.g. Shannon, Ace, and Simpson evenness index). Glomus and Acaulospora were the dominate AMF genera as assessed through their relative abundance and occurrence in control and warming treatments at the different elevations. Conclusion Warming changed significantly AMF community. The effects of warming on AMF community structure varied depend on elevations. Moreover, the occurrences of AMF in different genera were also presented the different responses to warming in four elevations.
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Affiliation(s)
- Mei Yang
- College of Agriculture, Henan University of Science and Technology, Luoyang, China.,Henan Engineering Research Center for Rural Human Settlement, Luoyang, China.,Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang, China
| | - Zhaoyong Shi
- College of Agriculture, Henan University of Science and Technology, Luoyang, China.,Henan Engineering Research Center for Rural Human Settlement, Luoyang, China.,Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang, China
| | - Bede S Mickan
- UWA School of Agriculture and Environment, the University of Western Australia, Perth WA, Australia.,The UWA Institute of Agriculture, the University of Western Australia, Perth WA, Australia
| | - Mengge Zhang
- College of Agriculture, Henan University of Science and Technology, Luoyang, China.,Henan Engineering Research Center for Rural Human Settlement, Luoyang, China.,Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang, China
| | - Libing Cao
- College of Agriculture, Henan University of Science and Technology, Luoyang, China
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