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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

The relation between yield(in kg/ha; y-axis) and accumulated canopy cover (A in %.days; x-axis) for three botanical groups. Different symbols refer to different molecular clusters. Values presented are averages of 5 replications. Correlation coefficients are: a (varieties belonging to glaberrima): r = 0.476 (P<0.01); b (varieties belonging to indica): r = 0.483 (P<0.05); c (varieties belonging to japonica): r = 0.706 (P<0.01).
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pone-0034801-g004: The relation between yield(in kg/ha; y-axis) and accumulated canopy cover (A in %.days; x-axis) for three botanical groups. Different symbols refer to different molecular clusters. Values presented are averages of 5 replications. Correlation coefficients are: a (varieties belonging to glaberrima): r = 0.476 (P<0.01); b (varieties belonging to indica): r = 0.483 (P<0.05); c (varieties belonging to japonica): r = 0.706 (P<0.01).

Mentions: Figures 4a–c show the graphical representations of the relationships between yield and A for each botanical group. At cluster level different relationships were observed. The relation between yield and A was similarly low for Glab_LowerCoast and Glab_UpperCoast (r = 0.451 and r = 0.476**, respectively). This shows that glaberrima can yield well even when relatively low accumulated canopy cover is produced.


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)

The relation between yield(in kg/ha; y-axis) and accumulated canopy cover (A in %.days; x-axis) for three botanical groups. Different symbols refer to different molecular clusters. Values presented are averages of 5 replications. Correlation coefficients are: a (varieties belonging to glaberrima): r = 0.476 (P<0.01); b (varieties belonging to indica): r = 0.483 (P<0.05); c (varieties belonging to japonica): r = 0.706 (P<0.01).
© Copyright Policy
Related In: Results  -  Collection

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

pone-0034801-g004: The relation between yield(in kg/ha; y-axis) and accumulated canopy cover (A in %.days; x-axis) for three botanical groups. Different symbols refer to different molecular clusters. Values presented are averages of 5 replications. Correlation coefficients are: a (varieties belonging to glaberrima): r = 0.476 (P<0.01); b (varieties belonging to indica): r = 0.483 (P<0.05); c (varieties belonging to japonica): r = 0.706 (P<0.01).
Mentions: Figures 4a–c show the graphical representations of the relationships between yield and A for each botanical group. At cluster level different relationships were observed. The relation between yield and A was similarly low for Glab_LowerCoast and Glab_UpperCoast (r = 0.451 and r = 0.476**, respectively). This shows that glaberrima can yield well even when relatively low accumulated canopy cover is produced.

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