Ibadan, Nigeria
Ibadan, Nigeria

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Santos C.,Africa Rice Center | Santos C.,University Abomey Calavi | Agbangla C.,University Abomey Calavi | Chougourou D.,University Abomey Calavi | And 4 more authors.
Journal of Entomology | Year: 2014

Twenty one rice varieties including 18 upland NERICAs and their parents (two Oryza sativa and one O. glaberrima) were screened for resistance to two primary storage pests: Sitophilus oryzae and Sitotroga cerealella, using the “no choice” infestation method. Resistance of rice varieties was assessed based on the adult's population obtained from first generation of each species and also on the weight loss recorded on infested samples. Results revealed that adult progenies from S. oryzae and weight loss were very low on paddy and fairly high on husked rice. Results also suggested that glumes are one main parameter conferring the resistance to S. oryzae. Differential responses of rice varieties to S. cerealella were observed. Of the 18 NERICA tested, NERICA6, 14, 4, 3, 15 and 16 were tolerant in increasing order, whereas only NERICA9 and 11 were susceptible. The Oryza glaberrima parent CG 14 was resistant to the insect while the O. satiυa parents WAB 56-50 and WAB 56-104 were susceptible. Progenies resistance to the insect may have been provided by the parent CG 14. The implications of the findings and the way forward were discussed. © 2014, Academic Journals Inc.

Sikirou M.,University Abomey Calavi | Sikirou M.,Africa Rice Center | Saito K.,Africa Rice Center | Achigan-Dako E.G.,University Abomey Calavi | And 3 more authors.
Plant Production Science | Year: 2015

In sub-Saharan Africa, the demand for higher rice production continues to grow rapidly. Although there is a huge potential for increasing rice production through expansion of the rice cultivation area in wetlands, iron (Fe) toxicity tends to occur and consequently results in low rice yield. Development and deployment of varieties tolerant to Fe toxicity is one of the practical options to overcome this constraint. Several tolerant varieties have been developed through conventional breeding but progress in breeding has been generally slow mainly due to large genotype × environment interaction and field heterogeneity, which make rice selection ineffective. In addition, there are no valid managed-stress screening protocols which are highly efficient and that can predict rice performance in the diverse target environments of West Africa. Many O. glaberrima accessions have superior tolerance, but only a few of them have been utilized in breeding programs. The known quantitative trait loci (QTLs) related to Fe toxicity, have not been used for marker-assisted selection (MAS), as they gave small effects with a large confidence interval. Accelerating rice breeding efficiency for tolerance to Fe toxicity requires establishment of reliable screening protocols, use of O. glaberrima accessions as donors, identification of large-effect QTLs and MAS using such QTLs. This paper reviews the past and current efforts in West Africa to develop new varieties with superior tolerance to Fe toxicity. © 2015, Crop Science Society of Japan. All rights reserved.

Buah S.S.J.,Savanna Agricultural Research Institute | Nutsugah S.K.,Savanna Agricultural Research Institute | Kanton R.A.L.,Savanna Agricultural Research Institute | Atokple I.D.K.,Savanna Agricultural Research Institute | And 7 more authors.
African Journal of Agricultural Research | Year: 2011

A two-year emergency rice (Oryza sativa L.) initiative was launched in 2009 in response to the global rice crises in 2008. The objective of this initiative in Ghana was to increase rice productivity in order to improve food security. Project activities included planning sessions, demonstrations, training courses and community seed production. The project made remarkable progress in enhancing access to quality seed and fertilizer for over 12,600 farmers while expanding knowledge of best-bet production technologies. Farmers produced 28,663 Mt of paddy which was 16,841 Mt above what they normally produced without project intervention. Average yield increased by 92% and also 4,093 women farmers constituting about 32.4% of the total number of participating farmers benefited directly from the project. Seed fairs, rural radios and audio-visual broadcasts on improved rice production technologies were used to reach non-participating farmers. The combination of methods that stimulated adoption of improved rice production technology was effective in achieving both increased paddy yields and household income. We conclude that investment in rice technology transfer and production efforts during the two-year period was well justified. © 2011 Academic Journals.

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