Managing the major diseases of rice in Africa.

Séré, Y.; Fargette, Denis; Abo, Mitsuru; Wydra, Kerstin; Bimerew, M.; Onasanya, A.; Akator, S. K.; Wopereis, M.C.S.; Johnson, D. E.; Ahmadi, N.; Tollens, Éric; Jalloh, A.

doi:10.1079/9781845938123.0213

Cited by 29 publications

(25 citation statements)

References 84 publications

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“…As in other rice-growing areas of the world, rice blast disease caused by the fungus Magnaporthe oryzae (Bourett and Howard 1990;Ribot et al 2008) is a major constraint for rice production in Africa. The disease is spreading in both lowland and upland ecosystems (Séré et al 2013). Deployment of resistant varieties combined with the use of good cultural practices remains the most promising approach to blast disease management (Maclean and Dawe 2002;Mew et al 2004;Savary et al 2012).…”

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confidence: 99%

Genome-Wide Association Mapping of Rice Resistance Genes Against Magnaporthe oryzae Isolates from Four African Countries

et al. 2016

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Rice blast disease is emerging as a major constraint to rice production in Africa. Although a traditional gene-tagging strategy using biparental crosses can effectively identify resistance (R) genes or quantitative trait loci (QTL) against Magnaporthe oryzae, the mapping procedure required is time consuming and requires many populations to investigate the genetics of resistance. In this report, we conducted a genome-wide association study (GWAS) to rapidly map rice genes conferring resistance against eight M. oryzae isolates from four African countries. We inoculated 162 rice cultivars, which were part of the rice diversity panel 1 (RDP1) and were previously genotyped with the 44,000 single-nucleotide polymorphism (SNP) chip, with the eight isolates. The GWAS identified 31 genomic regions associated with blast resistance (RABR) in the rice genome. In addition, we used polymerase chain reaction analysis to confirm the association between the Pish gene and a major RABR on chromosome 1 that was associated with resistance to four M. oryzae isolates. Our study has demonstrated the power of GWAS for the rapid identification of rice blast R or QTL genes that are effective against African populations of M. oryzae. The identified SNP markers associated with RABR can be used in breeding for resistance against rice blast in Africa.

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Genome-Wide Association Mapping of Rice Resistance Genes Against Magnaporthe oryzae Isolates from Four African Countries

et al. 2016

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“…De même Bouet et al (2015) avaient relevé qu'en riziculture ivoirienne irriguée à Tiassalé la variété CK 90 était résistante et la variété CK 73 relativement sensible. La pyriculariose foliaire est connue comme une contrainte biotique majeure dans la riziculture aquatique (riziculture irriguée et de bas-fonds) en Afrique de l'Ouest (Bouet, 2008 ;Séré et al, 2013 ;Odjo et al, 2014). Cependant sur le site de Petit Bouaké à Yamoussoukro, soit il n'y a pas eu d'épidémie importante soit les variétés testées ont présenté un bon profil de résistance.…”

Section: Introductionunclassified

Évaluation de deux variétés de riz (CK73 et CK90) à la Toxicité Ferreuse et à quelques contraintes biotiques à Yamoussoukro (Côte d’Ivoire)

Gnago¹,

Kouadio²,

Tia³

et al. 2017

J. App. Bioscience.

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Evaluation of two rice varieties (CK73 and CK90) on iron toxicity and some biotic stress in Yamoussoukro (Ivory Coast) ABSTRACT Objective: The iron toxicity is a nutrient disorder associated with high iron concentrations may be lead to a significant impact on rice yield. The objective of this study is to evaluate the behaviors of two rice varieties CK73 and CK90 on iron toxicity and some biotic stress in irrigated lowlands on the perimeter of Petit Bouaké at Yamoussoukro in Ivory Coast. Methodology and results: A randomized complete block design with three replications was implemented in order to compare CK73 and CK90 introduced varieties with WITA9 as control which was already known. Iron toxicity, blast disease and leaf blight scores were recorded. The mean of iron toxicity visual score of tested varieties are 3.5, 3.9, 4.2 for CK90, WITA9 and CK73 respectively. Average yield of paddy for tested varieties are 2.7 T/ha, 2.2 T/ha, 4.5 T/ha for CK73, CK90 and WITA 9 respectively. The tolerance of varieties to blast disease was good with mean scores of 1.6; 1; 1 for CK73, CK90 and WITA9 respectively. Furthermore, the mean of leaf blight visual score of varieties are 5.4; 3.2; 2.6 for CK 73, CK90 and WITA9 respectively. Conclusion and applications:The evaluation of two rice varieties (CK73 and CK90) in order to disseminate in Ivory Coast was able to confirm their tolerance on iron toxicity in the site of Yamoussoukro. Furthermore, WITA9 which was already disseminated showing a moderate level of tolerance. Paddy yields of the two new varieties are acceptable against the specification sheets (3-4 T/ha).

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“…In some West African countries (Burkina Faso, Niger and Mali), much damage has been produced by this devastating disease of rice. Many studies have also been conducted on these bacteria, particularly in Asia, exposing the losses they cause in rice production fields (Ou, 1985;Adhikari, Mew, & Teng, 1994). In the Philippines, resistant varieties to certain strains of Xanthomonas oryzae pv.…”

Section: Introductionmentioning

confidence: 99%

Identification of Bacterial Diseases in Rice Plants Leaves by the Use of Spectroscopic Imaging

Sangare¹,

Tekete²,

Bagui³

et al. 2015

APR

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Rice is staple in the African habitats menu. Bacterial wilt (BLB) and leaf streak (BLS) are some of the phytopathological diseases which restrain rice production around the world. In this paper, multi-spectral and multimodal imaging techniques have been developed to characterize the rice leaves with symptoms of bacterial wilt (BLB) and leaf streak (BLS), and to provide information on their effects, in order to reduce their spread. First, we recorded microscopic and spectroscopic images of the samples using multimodal and multispectral microscope, with spectral region ranging from UV to NIR, for each mode. Then, we extracted the spectral footprints of the cells constituents, in transmission, reflection and scattering from the spectral images. Applying multivariate statistical analysis methods to this optical spectra allowed us to characterize the effect of bacterial rice leaves caused by Xanthomonas oryzae strains. The results of the proposed technique can be useful for easy identification of this type of infection, and can serve as routine approach in biochemical and agronomic laboratories.

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Managing the major diseases of rice in Africa.

Cited by 29 publications

References 84 publications

Genome-Wide Association Mapping of Rice Resistance Genes Against Magnaporthe oryzae Isolates from Four African Countries

Genome-Wide Association Mapping of Rice Resistance Genes Against Magnaporthe oryzae Isolates from Four African Countries

Évaluation de deux variétés de riz (CK73 et CK90) à la Toxicité Ferreuse et à quelques contraintes biotiques à Yamoussoukro (Côte d’Ivoire)

Identification of Bacterial Diseases in Rice Plants Leaves by the Use of Spectroscopic Imaging

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