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Nihorimbere G, Korangi Alleluya V, Nimbeshaho F, Nihorimbere V, Legrève A, Ongena M. Bacillus-based biocontrol beyond chemical control in central Africa: the challenge of turning myth into reality. FRONTIERS IN PLANT SCIENCE 2024; 15:1349357. [PMID: 38379944 PMCID: PMC10877027 DOI: 10.3389/fpls.2024.1349357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/08/2024] [Indexed: 02/22/2024]
Abstract
Agricultural productivity in the Great Lakes Countries of Central Africa, including Burundi, Rwanda, and the Democratic Republic of Congo, is affected by a wide range of diseases and pests which are mainly controlled by chemical pesticides. However, more than 30% of the pesticides used in the region are banned in European Union due to their high toxicity. Globally available safe and eco-friendly biological alternatives to chemicals are virtually non-existent in the region. Bacillus PGPR-based biocontrol products are the most dominant in the market and have proven their efficacy in controlling major plant diseases reported in the region. With this review, we present the current situation of disease and pest management and urge the need to utilize Bacillus-based control as a possible sustainable alternative to chemical pesticides. A repertoire of strains from the Bacillus subtilis group that have shown great potential to antagonize local pathogens is provided, and efforts to promote their use, as well as the search for indigenous and more adapted Bacillus strains to local agro-ecological conditions, should be undertaken to make sustainable agriculture a reality in the region.
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Affiliation(s)
- Gaspard Nihorimbere
- Phytopathology- Applied Microbiology, Earth, and Life Institute, UCLouvain, Louvain-la-neuve, Belgium
- Unité de défense des végétaux, Institut des Sciences Agronomiques du Burundi, Bujumbura, Burundi
| | - Virginie Korangi Alleluya
- Microbial Processes and Interactions, TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
- Chemical and Agricultural Industries, Faculty of Agricultural Sciences, University of Kinshasa, Kinshasa, Democratic Republic of Congo
| | - François Nimbeshaho
- Microbial Processes and Interactions, TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
- Laboratoire de Nutrition-Phytochimie, d’Ecologie et d’Environnement Appliquée, Centre Universitaire de Recherche et de Pédagogie Appliquées aux Sciences, Institut de Pédagogie Appliquée, Université du Burundi, Bujumbura, Burundi
| | - Venant Nihorimbere
- Département des Sciences et Technologie des Aliments, Faculté de Bio-Ingénierie, Université du Burundi, Bujumbura, Burundi
| | - Anne Legrève
- Phytopathology- Applied Microbiology, Earth, and Life Institute, UCLouvain, Louvain-la-neuve, Belgium
| | - Marc Ongena
- Microbial Processes and Interactions, TERRA Teaching and Research Center, Gembloux Agro-Bio Tech, University of Liège, Gembloux, Belgium
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Hamilton CD, Zaricor B, Dye CJ, Dresserl E, Michaels R, Allen C. Ralstonia solanacearum pandemic lineage strain UW551 overcomes inhibitory xylem chemistry to break tomato bacterial wilt resistance. MOLECULAR PLANT PATHOLOGY 2024; 25:e13395. [PMID: 37846613 PMCID: PMC10782650 DOI: 10.1111/mpp.13395] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 08/01/2023] [Accepted: 09/15/2023] [Indexed: 10/18/2023]
Abstract
Plant-pathogenic Ralstonia strains cause bacterial wilt disease by colonizing xylem vessels of many crops, including tomato. Host resistance is the best control for bacterial wilt, but resistance mechanisms of the widely used Hawaii 7996 tomato breeding line (H7996) are unknown. Using growth in ex vivo xylem sap as a proxy for host xylem, we found that Ralstonia strain GMI1000 grows in sap from both healthy plants and Ralstonia-infected susceptible plants. However, sap from Ralstonia-infected H7996 plants inhibited Ralstonia growth, suggesting that in response to Ralstonia infection, resistant plants increase inhibitors in their xylem sap. Consistent with this, reciprocal grafting and defence gene expression experiments indicated that H7996 wilt resistance acts in both above- and belowground plant parts. Concerningly, H7996 resistance is broken by Ralstonia strain UW551 of the pandemic lineage that threatens highland tropical agriculture. Unlike other Ralstonia, UW551 grew well in sap from Ralstonia-infected H7996 plants. Moreover, other Ralstonia strains could grow in sap from H7996 plants previously infected by UW551. Thus, UW551 overcomes H7996 resistance in part by detoxifying inhibitors in xylem sap. Testing a panel of xylem sap compounds identified by metabolomics revealed that no single chemical differentially inhibits Ralstonia strains that cannot infect H7996. However, sap from Ralstonia-infected H7996 contained more phenolic compounds, which are known to be involved in plant antimicrobial defence. Culturing UW551 in this sap reduced total phenolic levels, indicating that the resistance-breaking Ralstonia strain degrades these chemical defences. Together, these results suggest that H7996 tomato wilt resistance depends in part on inducible phenolic compounds in xylem sap.
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Affiliation(s)
- Corri D. Hamilton
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
- Department of Microbiology and ImmunologyUniversity of British ColumbiaVancouverBritish ColumbiaCanada
| | - Beatriz Zaricor
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
| | - Carolyn Jean Dye
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
| | - Emma Dresserl
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
| | - Renee Michaels
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
| | - Caitilyn Allen
- Department of Plant PathologyUniversity of Wisconsin MadisonMadisonWisconsinUSA
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Cellier G, Nordey T, Cortada L, Gauche M, Rasoamanana H, Yahiaoui N, Rébert E, Prior P, Chéron JJ, Poussier S, Pruvost O. Molecular Epidemiology of Ralstonia pseudosolanacearum Phylotype I Strains in the Southwest Indian Ocean Region and Their Relatedness to African Strains. PHYTOPATHOLOGY 2023; 113:423-435. [PMID: 36399027 DOI: 10.1094/phyto-09-22-0355-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The increasing requirement for developing tools enabling fine strain traceability responsible for epidemics is tightly linked with the need to understand factors shaping pathogen populations and their environmental interactions. Bacterial wilt caused by the Ralstonia solanacearum species complex (RSSC) is one of the most important plant diseases in tropical and subtropical regions. Sadly, little, outdated, or no information on its epidemiology is reported in the literature, although alarming outbreaks are regularly reported as disasters. A large set of phylotype I isolates (n = 2,608) was retrieved from diseased plants in fields across the Southwest Indian Ocean (SWIO) and Africa. This collection enabled further assessment of the epidemiological discriminating power of the previously published RS1-MLVA14 scheme. Thirteen markers were validated and characterized as not equally informative. Most had little infra-sequevar polymorphism, and their performance depended on the sequevar. Strong correlation was found with a previous multilocus sequence typing scheme. However, 2 to 3% of sequevars were not correctly assigned through endoglucanase gene sequence. Discriminant analysis of principal components (DAPC) revealed four groups with strong phylogenetic relatedness to sequevars 31, 33, and 18. Phylotype I-31 isolates were highly prevalent in the SWIO and Africa, but their dissemination pathways remain unclear. Tanzania and Mauritius showed the greatest diversity of RSSC strains, as the four DAPC groups were retrieved. Mauritius was the sole territory harboring a vast phylogenetic diversity and all DAPC groups. More research is still needed to understand the high prevalence of phylotype I-31 at such a large geographic scale.
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Affiliation(s)
- Gilles Cellier
- Anses, Plant Health Laboratory, Saint Pierre, Reunion Island
| | | | - Laura Cortada
- East Africa Hub, International Institute of Tropical Agriculture (IITA), Nairobi, Kenya
- Nematology Section, Department of Biology, Ghent University, Ghent, Belgium
| | - Mirana Gauche
- University of Reunion Island, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Hasina Rasoamanana
- University of Reunion Island, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Noura Yahiaoui
- Anses, Plant Health Laboratory, Saint Pierre, Reunion Island
- University of Reunion Island, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Emeline Rébert
- University of Reunion Island, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Philippe Prior
- INRAE, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint-Pierre, Reunion Island
| | - Jean Jacques Chéron
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Stéphane Poussier
- University of Reunion Island, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
| | - Olivier Pruvost
- CIRAD, UMR Peuplements végétaux et bioagresseurs en milieu tropical, Saint Pierre, Reunion Island
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Sharma K, Iruegas-Bocardo F, Abdurahman A, Alcalá-Briseño RI, Garrett KA, Goss EM, Ngundo G, Kreuze J, Atieno E, Munguti F. Ralstonia Strains from Potato-Growing Regions of Kenya Reveal Two Phylotypes and Epidemic Clonality of Phylotype II Sequevar 1 Strains. PHYTOPATHOLOGY 2022; 112:2072-2083. [PMID: 35522048 DOI: 10.1094/phyto-11-21-0455-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Bacterial wilt, caused by the Ralstonia solanacearum species complex (RSSC), is the most destructive potato disease in Kenya. Studies were conducted to (i) determine the molecular diversity of RSSC strains associated with bacterial wilt of potato in Kenya, (ii) generate an RSSC distribution map for epidemiological inference, and (iii) determine whether phylotype II sequevar 1 strains exhibit epidemic clonality. Surveys were conducted in 2018 and 2019, in which tubers from wilting potato plants and stem samples of potential alternative hosts were collected for pathogen isolation. The pathogen was phylotyped by multiplex PCR and 536 RSSC strains typed at a sequevar level. Two RSSC phylotypes were identified, phylotype II (98.4%, n = 506 [sequevar 1 (n = 505) and sequevar 2 (n = 1)]) and phylotype I (1.6%, n = 30 [sequevar 13 (n = 9) and a new sequevar (n = 21)]). The phylotype II sequevar 1 strains were haplotyped using multilocus tandem repeat sequence typing (TRST) schemes. The TRST scheme identified 51 TRST profiles within the phylotype II sequevar 1 strains with a modest diversity index (HGDI = 0.87), confirming the epidemic clonality of RSSC phylotype II sequevar 1 strains in Kenya. A minimum spanning tree and mapping of the TRST profiles revealed that TRST27 '8-5-12-7-5' is the primary founder of the clonal complex of RSSC phylotype II sequevar 1 and is widely distributed via latently infected seed tubers. [Formula: see text] Copyright © 2022 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Kalpana Sharma
- Consultative Group for International Agricultural Research (CGIAR) Research Program on Roots, Tubers and Bananas (RTB), Centro Internacional de la Papa, Nairobi, Kenya, Lima, Peru
- International Potato Center (CIP), Sub-Saharan Africa Regional Office, Nairobi, Kenya
| | | | - Abdulwahab Abdurahman
- Consultative Group for International Agricultural Research (CGIAR) Research Program on Roots, Tubers and Bananas (RTB), Centro Internacional de la Papa, Nairobi, Kenya, Lima, Peru
- International Potato Center (CIP), Sub-Saharan Africa Regional Office, Nairobi, Kenya
| | - Ricardo I Alcalá-Briseño
- Plant Pathology Department, University of Florida, Gainesville, FL, U.S.A
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, U.S.A
- Food Systems Institute, University of Florida, Gainesville, FL, U.S.A
| | - Karen A Garrett
- Plant Pathology Department, University of Florida, Gainesville, FL, U.S.A
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, U.S.A
- Food Systems Institute, University of Florida, Gainesville, FL, U.S.A
| | - Erica M Goss
- Plant Pathology Department, University of Florida, Gainesville, FL, U.S.A
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, U.S.A
| | - George Ngundo
- Kenya Plant Health Inspectorate Service (KEPHIS), Plant Quarantine and Biosecurity Station (PQBS), Nairobi, Kenya
| | - Jan Kreuze
- Consultative Group for International Agricultural Research (CGIAR) Research Program on Roots, Tubers and Bananas (RTB), Centro Internacional de la Papa, Nairobi, Kenya, Lima, Peru
- International Potato Center (CIP), Crop and Systems Sciences Division, Lima, Peru
| | - Elly Atieno
- Consultative Group for International Agricultural Research (CGIAR) Research Program on Roots, Tubers and Bananas (RTB), Centro Internacional de la Papa, Nairobi, Kenya, Lima, Peru
- International Potato Center (CIP), Sub-Saharan Africa Regional Office, Nairobi, Kenya
| | - Florence Munguti
- Kenya Plant Health Inspectorate Service (KEPHIS), Plant Quarantine and Biosecurity Station (PQBS), Nairobi, Kenya
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Habe I, Miyatake K. Identification and characterization of resistance quantitative trait loci against bacterial wilt caused by the Ralstonia solanacearum species complex in potato. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2022; 42:50. [PMID: 37313419 PMCID: PMC10248640 DOI: 10.1007/s11032-022-01321-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 08/11/2022] [Indexed: 06/15/2023]
Abstract
Bacterial wilt (BW) caused by the Ralstonia solanacearum species complex (RSSC) represents one of the most serious diseases affecting potato cultivation. The development of BW-resistant cultivars represents the most efficient strategy to control this disease. The resistance-related quantitative trait loci (QTLs) in plants against different RSSC strains have not been studied extensively. Therefore, we performed QTL analysis for evaluating BW resistance using a diploid population derived from Solanum phureja, S. chacoense, and S. tuberosum. Plants cultivated in vitro were inoculated with different strains (phylotype I/biovar 3, phylotype I/biovar 4, and phylotype IV/biovar 2A) and incubated at 24 °C or 28 °C under controlled conditions. Composite interval mapping was performed for the disease indexes using a resistant parent-derived map and a susceptible parent-derived map consisting of single-nucleotide polymorphism markers. We identified five major and five minor resistance QTLs on potato chromosomes 1, 3, 5, 6, 7, 10, and 11. The major QTLs PBWR-3 and PBWR-7 conferred stable resistance against Ralstonia pseudosolanacearum (phylotype I) and Ralstonia syzygii (phylotype IV), whereas PBWR-6b was a strain-specific major resistance QTL against phylotype I/biovar 3 and was more effective at a lower temperature. Therefore, we suggest that broad-spectrum QTLs and strain-specific QTLs can be combined to develop the most effective BW-resistant cultivars for specific areas. Supplementary Information The online version contains supplementary material available at 10.1007/s11032-022-01321-9.
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Affiliation(s)
- Ippei Habe
- Nagasaki Agriculture and Forestry Technical Development Center, 3118 Kaizu, Isahaya, Nagasaki, 854-0063 Japan
| | - Koji Miyatake
- Institute of Vegetable and Floriculture Science, NARO, Kusawa 360, Mie, Tsu, 514-2392 Japan
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