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Kudjordjie EN, Schmidt-Høier AS, Brøndum MB, Johnsen MG, Nicolaisen M, Vestergård M. Early assessment of fungal and oomycete pathogens in greenhouse irrigation water using Oxford nanopore amplicon sequencing. PLoS One 2024; 19:e0300381. [PMID: 38489283 PMCID: PMC10942031 DOI: 10.1371/journal.pone.0300381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Accepted: 02/26/2024] [Indexed: 03/17/2024] Open
Abstract
Water-borne plant pathogenic fungi and oomycetes are a major threat in greenhouse production systems. Early detection and quantification of these pathogens would enable us to ascertain both economic and biological thresholds required for a timely treatment, thus improving effective disease management. Here, we used Oxford nanopore MinION amplicon sequencing to analyze microbial communities in irrigation water collected from greenhouses used for growing tomato, cucumber and Aeschynanthus sp. Fungal and oomycete communities were characterized using primers that amplify the full internal transcribed spacer (ITS) region. To assess the sensitivity of the MinION sequencing, we spiked serially diluted mock DNA into the DNA isolated from greenhouse water samples prior to library preparation. Relative abundances of fungal and oomycete reads were distinct in the greenhouse irrigation water samples and in water samples from setups with tomato that was inoculated with Fusarium oxysporum. Sequence reads derived from fungal and oomycete mock communities were proportionate in the respective serial dilution samples, thus confirming the suitability of MinION amplicon sequencing for environmental monitoring. By using spike-ins as standards to test the reliability of quantification using the MinION, we found that the detection of spike-ins was highly affected by the background quantities of fungal or oomycete DNA in the sample. We observed that spike-ins having shorter length (538bp) produced reads across most of our dilutions compared to the longer spikes (>790bp). Moreover, the sequence reads were uneven with respect to dilution series and were least retrievable in the background samples having the highest DNA concentration, suggesting a narrow dynamic range of performance. We suggest continuous benchmarking of the MinION sequencing to improve quantitative metabarcoding efforts for rapid plant disease diagnostic and monitoring in the future.
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Affiliation(s)
- Enoch Narh Kudjordjie
- Department of Agroecology, Faculty of Technical Sciences, Aarhus University, Slagelse, Denmark
| | | | | | | | - Mogens Nicolaisen
- Department of Agroecology, Faculty of Technical Sciences, Aarhus University, Slagelse, Denmark
| | - Mette Vestergård
- Department of Agroecology, Faculty of Technical Sciences, Aarhus University, Slagelse, Denmark
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Li Y, Jiang S, Jiang J, Gao C, Qi X, Zhang L, Sun S, Dai Y, Fan X. Synchronized Efficacy and Mechanism of Alkaline Fertilizer and Biocontrol Fungi for Fusariumoxysporum f. sp. cubense Tropical Race 4. J Fungi (Basel) 2022; 8:jof8030261. [PMID: 35330263 PMCID: PMC8953788 DOI: 10.3390/jof8030261] [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: 02/08/2022] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 12/19/2022] Open
Abstract
The purpose of this study was to determine the effect and mechanism of alkaline fertilizer, bio-control fungi, and their synergistic application on control of Fusarium Tr4 incidence. Synchronized use of the alkaline fertilizer and biocontrol fungi eliminates rhizome browning and reduces the incidence rate of banana Fusarium wilt. The incidence of yellow leaves (ratio of yellow leaf to total leaf) and disease index in +Foc Tr4 CF treatment were the same (65%), while incidence of yellow leaves and disease index in +Foc Tr4 AFBCF were 31% and 33%, respectively. Under the stress of Foc Tr4 infection, the synergistic utilization of the alkaline fertilizer and biocontrol fungi would raise the activities of peroxidase, catalase and superoxide dismutase in banana roots. The root activity of banana was also increased. As a result, the banana height and stem diameter increments, shoot and root dry weight, accumulation of N, P and K in banana plants had been increased. The efficacy of the synergistic application of alkaline fertilizer and biocontrol fungi was not only reducing Foc Tr4 pathogen colonization and distribution in banana plants, but also preventing tylosis formation in vascular vessel effectively. Therefore, the normal transport of water and nutrients between underground and aboveground is ensured.
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Affiliation(s)
- Yuanqiong Li
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Shuting Jiang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Jiaquan Jiang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Chengxiang Gao
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Xiuxiu Qi
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Lidan Zhang
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Shaolong Sun
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Yinhai Dai
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
| | - Xiaolin Fan
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China; (Y.L.); (S.J.); (J.J.); (C.G.); (X.Q.); (L.Z.); (S.S.); (Y.D.)
- R&D Center of Environment Friendly Fertilizer Science and Technology, South China Agricultural University, Guangzhou 510642, China
- Correspondence:
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