Confirmation Report of Bacterial Blight Caused by <i>Xanthomonas oryzae</i> pv. <i>oryzae</i> on Rice in Senegal

Tall, Hamidou; Tekete, C.; Noba, Kandioura; Koïta, Ousmane; Cunnac, Sébastien; Hutin, M.; Szurek, Boris

doi:10.1094/pdis-07-19-1464-pdn

Cited by 5 publications

(6 citation statements)

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“…The first observations of BB in Africa were made in Mali in 1979 (Buddenhagen et al, 1979). Since then, the disease has been reported mostly in West Africa, including Senegal, Benin, Burkina Faso, Ivory Coast, Mali and Niger (Afolabi et al, 2016; Gonzalez et al, 2007; Tall et al, 2020; Tekete et al, 2020). More recently, BB was also reported in the East African countries Uganda and Tanzania (Duku et al, 2016; Oliva et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

“…More recently, BB was also reported in the East African countries Uganda and Tanzania (Duku et al, 2016; Oliva et al, 2019). To systematically analyze these newly isolated strains and to compare them to the broader African Xoo landscape, 833 strains from rice fields sampled in nine African countries between 2003 and 2021 were collected and characterized using molecular diagnostic as well as pathogenicity assays (Supplementary Table 1)(Afolabi et al, 2016; Gonzalez et al, 2007; Tall et al, 2020; Tekete et al, 2020). During this study, two unprecedented outbreaks were identified, one in 2019 in Dakawa and another in 2022 in Lukenge (Supplementary Table 2).…”

Section: Resultsmentioning

confidence: 99%

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Genome editing of an African elite rice variety confers resistance against endemic and emergingXanthomonas oryzaepv.oryzaestrains

Schepler-Luu

Sciallano

Stiebner

et al. 2022

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Bacterial leaf blight (BB) of rice, caused by Xanthomonas oryzae pv. oryzae (Xoo), threatens global food security and the livelihood of small-scale rice producers. Analyses of Xoo collections from Asia, Africa and the Americas demonstrated surprising continental segregation, despite robust global rice trade. Here, we report unprecedented BB outbreaks in Tanzania. The causative strains, unlike endemic Xoo, carry Asian-type TAL effectors targeting the sucrose transporter SWEET11a and suppressing Xa1. Phylogenomics clustered these strains with Xoo strains from China. African rice varieties do not carry suitable resistance genes. To protect African rice production against this emerging threat, we developed a hybrid CRISPR-Cas9/Cpf1 system to edit six TALe-binding elements in three SWEET promoters of the East African elite variety Komboka. The edited lines show broad-spectrum resistance against Asian and African strains of Xoo, including strains recently discovered in Tanzania. This strategy could help to protect global rice crops from BB pandemics.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Genome editing of an African elite rice variety confers resistance against endemic and emergingXanthomonas oryzaepv.oryzaestrains

Schepler-Luu

Sciallano

Stiebner

et al. 2022

Preprint

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“…Bacterial blight is one of the most damaging bacterial diseases that affects rice production in several rice-producing countries globally. Senegal, a prominent rice-producing country in West Africa, has recently documented a signi cant prevalence of this disease over most of its rice cultivation regions (Tall et al, 2020). The unanticipated expansion of BB to rainfed ecologies is occurring in the absence of varieties that possess resistance in Senegalese rainfed environments.…”

Section: Discussionmentioning

confidence: 99%

“…The strains used in this study consisted of ve strains of Xoo that were representative of the races documented in Senegal (Table 2). These strains were isolated from rice leaf samples collected from two regions of Senegal under lowland and irrigated environment from 2013 to 2015 and preserved at the ''Institut de Recherche pour le Développement'' (IRD) in Montpellier (Tall et al, 2020). The bacteria strains were cultured on PSA medium (per liter: 10 g Peptone, 10 g Sucrose, 15 g Agar, 1 g glutamic Acid, pH 7.0) at 28°C.…”

Section: Bacterial Strainsmentioning

confidence: 99%

“…BB is a devastating rice disease worldwide, and particularly in Africa where high yield losses have been reported in several countries of the West African region (Naqvi, 2019ré & Nacro, 1992. In Senegal, BB occurs mainly in Saint-Louis and Kedougou regions with an estimated incidence of 50% (Tall et al, 2020). BB development is favored by climatic factors such as high temperatures, high humility, strong winds and excess of fertilizers, especially nitrogen (Sharma et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Status of the resistance of selected rice (Oryzasativa) varieties to bacterial blight strains in Senegal

DOSSOU,

Foncéka,

Tall

et al. 2023

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Rice plays an important role in achieving and maintaining food and nutritional security in the world. However, its productivity is affected by various constraints, including biotic and abiotic stresses, and several socio-economic constraints. Regarding biotic factors, bacterial blight (BB) caused by Xanthomonas oryzae pv. oryzae (Xoo) is a major bacterial disease that causes severe yield losses of more than 70%, thereby threatening food and income security in most rice growing countries, including Senegal. Optimal control of this disease requires the use of host plant resistance, as it is economical and environmentally sustainable. Nevertheless, in the context of Senegal, the available sources of resistance are limited, and the potential for resistance among Senegalese rice varieties has been inadequately investigated. In this study we evaluated local rice germplasms for resistance to bacterial blight in Senegal. A trial was conducted in glasshouse conditions using a split-plot experimental design with 32 rice varieties as the main factor and five strains of Xanthomonas oryzae pv. oryzae (Xoo) as the secondary factor. Seven (07) of the popular rice varieties, including two (02) lowland (TOX 728-1 and BG 90 − 2), four (04) irrigated (ISRIZ 04, ISRIZ 05, ISRIZ 14 and SAHEL 202) and the variety GIGANTE exhibited full resistance against all strains tested. These varieties are suggested to be grown in Xoo-prone areas, and can be used for improving the resistance of other commercial varieties in other regions where Xoo is prevalent. A significant interaction between strains and varieties was detected, suggesting that pathogen race diversity may contribute to the determination of rice resistance to Xoo strains in Senegal. Among all bacterial strains, S82-4-1 of the race S4 exhibited the highest virulence. This strain can be used as reference for screening rice varieties in West-Africa.

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Xanthomonas oryzae pv. oryzae (rice leaf blight)

2022

CABI Compendium

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Confirmation Report of Bacterial Blight Caused by Xanthomonas oryzae pv. oryzae on Rice in Senegal

Cited by 5 publications

References 2 publications

Genome editing of an African elite rice variety confers resistance against endemic and emergingXanthomonas oryzaepv.oryzaestrains

Genome editing of an African elite rice variety confers resistance against endemic and emergingXanthomonas oryzaepv.oryzaestrains

Status of the resistance of selected rice (Oryzasativa) varieties to bacterial blight strains in Senegal

Xanthomonas oryzae pv. oryzae (rice leaf blight)

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