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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

Box plots for days to 50% flowering of 26 varieties in five experimental sites: 1: Ghana; 2: Sierra Leone; 3: Guinea Bissau; 4: Togo and 5: Guinea. See materials and methods section for coding of the botanical groups and molecular clusters.
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pone-0034801-g010: Box plots for days to 50% flowering of 26 varieties in five experimental sites: 1: Ghana; 2: Sierra Leone; 3: Guinea Bissau; 4: Togo and 5: Guinea. See materials and methods section for coding of the botanical groups and molecular clusters.

Mentions: Indica as well as glaberrima showed intensive tillering (Table 11). An increase in tiller number was observed from more favourable (Sierra Leone and Ghana) to less favourable environments (Guinea, Togo and Guinea Bissau) for the indica cluster (Figure 9). One of the underlying mechanisms facilitating the increase of tillers under less favourable conditions is that generally (for all botanical groups and clusters) under less favourable conditions (Guinea and Togo) the time to flowering is longer than under more favourable conditions (Sierra Leone and Ghana) (Figure 10). It seems particularly the case that the indica group uses this time to produce tillers while the japonica and glaberrima groups responded in various other ways.


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)

Box plots for days to 50% flowering of 26 varieties in five experimental sites: 1: Ghana; 2: Sierra Leone; 3: Guinea Bissau; 4: Togo and 5: Guinea. See materials and methods section for coding of the botanical groups and molecular clusters.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0034801-g010: Box plots for days to 50% flowering of 26 varieties in five experimental sites: 1: Ghana; 2: Sierra Leone; 3: Guinea Bissau; 4: Togo and 5: Guinea. See materials and methods section for coding of the botanical groups and molecular clusters.
Mentions: Indica as well as glaberrima showed intensive tillering (Table 11). An increase in tiller number was observed from more favourable (Sierra Leone and Ghana) to less favourable environments (Guinea, Togo and Guinea Bissau) for the indica cluster (Figure 9). One of the underlying mechanisms facilitating the increase of tillers under less favourable conditions is that generally (for all botanical groups and clusters) under less favourable conditions (Guinea and Togo) the time to flowering is longer than under more favourable conditions (Sierra Leone and Ghana) (Figure 10). It seems particularly the case that the indica group uses this time to produce tillers while the japonica and glaberrima groups responded in various other ways.

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