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Robustness and strategies of adaptation among farmer varieties of African Rice (Oryza glaberrima) and Asian Rice (Oryza sativa) across West Africa.

Mokuwa A, Nuijten E, Okry F, Teeken B, Maat H, Richards P, Struik PC - PLoS ONE (2013)

Bottom Line: This study offers evidence of the robustness of farmer rice varieties (Oryza glaberrima and O. sativa) in West Africa.The results contradict the rather common belief that farmer varieties are only of local value.Farmer varieties should be considered by breeding programmes and used (alongside improved varieties) in dissemination projects for rural food security.

View Article: PubMed Central - PubMed

Affiliation: Technology and Agrarian Development group, Wageningen University, Wageningen, The Netherlands.

ABSTRACT
This study offers evidence of the robustness of farmer rice varieties (Oryza glaberrima and O. sativa) in West Africa. Our experiments in five West African countries showed that farmer varieties were tolerant of sub-optimal conditions, but employed a range of strategies to cope with stress. Varieties belonging to the species Oryza glaberrima - solely the product of farmer agency - were the most successful in adapting to a range of adverse conditions. Some of the farmer selections from within the indica and japonica subspecies of O. sativa also performed well in a range of conditions, but other farmer selections from within these two subspecies were mainly limited to more specific niches. The results contradict the rather common belief that farmer varieties are only of local value. Farmer varieties should be considered by breeding programmes and used (alongside improved varieties) in dissemination projects for rural food security.

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Related in: MedlinePlus

Geographic overview of the West African study area.Reprinted from [16] under a CC BY license, with permission from Edwin Nuijten, copyright 2009. Original figure generated using Google Maps.
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pone-0034801-g013: Geographic overview of the West African study area.Reprinted from [16] under a CC BY license, with permission from Edwin Nuijten, copyright 2009. Original figure generated using Google Maps.

Mentions: From June to December 2007 we carried out field work in seven countries of Coastal West Africa, i.e. The Gambia, Ghana, Guinea, Guinea Bissau, Senegal, Sierra Leone and Togo (Figure 13). The field work aimed at (1) listing rice varieties/accessions used by farmers, (2) observing the development/physiology of these varieties in farmers' fields, and (3) collecting varieties at harvest. A total of 231 accessions were collected in 2007. After seed collection we carried out molecular analysis (AFLP) on the collected varieties in February and March 2008. Output of this molecular analysis was combined with the output of an analysis of 84 accessions performed in 2002 [21]. We used Version 2.2 of the software package ‘Structure’ to analyse genetic population structure and to assign samples to populations and ‘SplitsTree’ to visualize phylogenetic relationships between the samples. For further details please refer to [16]. Based on the output of the molecular analysis, 24 commonly cultivated farmer varieties (O. glaberrima and O. sativa, including representatives of both the indica and japonica groups) were selected for further study (Table 23). These 24 varieties reflect the popular varieties grown in different parts of the region and therefore provide a subset of the large set of farmer varieties identified, with good local performance but not necessarily large robustness. All 26 varieties were included in all five experiments described in this paper.


Robustness and strategies of adaptation among farmer varieties of African Rice (Oryza glaberrima) and Asian Rice (Oryza sativa) across West Africa.

Mokuwa A, Nuijten E, Okry F, Teeken B, Maat H, Richards P, Struik PC - PLoS ONE (2013)

Geographic overview of the West African study area.Reprinted from [16] under a CC BY license, with permission from Edwin Nuijten, copyright 2009. Original figure generated using Google Maps.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3585979&req=5

pone-0034801-g013: Geographic overview of the West African study area.Reprinted from [16] under a CC BY license, with permission from Edwin Nuijten, copyright 2009. Original figure generated using Google Maps.
Mentions: From June to December 2007 we carried out field work in seven countries of Coastal West Africa, i.e. The Gambia, Ghana, Guinea, Guinea Bissau, Senegal, Sierra Leone and Togo (Figure 13). The field work aimed at (1) listing rice varieties/accessions used by farmers, (2) observing the development/physiology of these varieties in farmers' fields, and (3) collecting varieties at harvest. A total of 231 accessions were collected in 2007. After seed collection we carried out molecular analysis (AFLP) on the collected varieties in February and March 2008. Output of this molecular analysis was combined with the output of an analysis of 84 accessions performed in 2002 [21]. We used Version 2.2 of the software package ‘Structure’ to analyse genetic population structure and to assign samples to populations and ‘SplitsTree’ to visualize phylogenetic relationships between the samples. For further details please refer to [16]. Based on the output of the molecular analysis, 24 commonly cultivated farmer varieties (O. glaberrima and O. sativa, including representatives of both the indica and japonica groups) were selected for further study (Table 23). These 24 varieties reflect the popular varieties grown in different parts of the region and therefore provide a subset of the large set of farmer varieties identified, with good local performance but not necessarily large robustness. All 26 varieties were included in all five experiments described in this paper.

Bottom Line: This study offers evidence of the robustness of farmer rice varieties (Oryza glaberrima and O. sativa) in West Africa.The results contradict the rather common belief that farmer varieties are only of local value.Farmer varieties should be considered by breeding programmes and used (alongside improved varieties) in dissemination projects for rural food security.

View Article: PubMed Central - PubMed

Affiliation: Technology and Agrarian Development group, Wageningen University, Wageningen, The Netherlands.

ABSTRACT
This study offers evidence of the robustness of farmer rice varieties (Oryza glaberrima and O. sativa) in West Africa. Our experiments in five West African countries showed that farmer varieties were tolerant of sub-optimal conditions, but employed a range of strategies to cope with stress. Varieties belonging to the species Oryza glaberrima - solely the product of farmer agency - were the most successful in adapting to a range of adverse conditions. Some of the farmer selections from within the indica and japonica subspecies of O. sativa also performed well in a range of conditions, but other farmer selections from within these two subspecies were mainly limited to more specific niches. The results contradict the rather common belief that farmer varieties are only of local value. Farmer varieties should be considered by breeding programmes and used (alongside improved varieties) in dissemination projects for rural food security.

Show MeSH
Related in: MedlinePlus