Maintenance of sorghum (sorghum bicolor, poaceae) landrace diversity by farmers’ selection in Ethiopia

Teshome, Awegechew; Fahrig, Lenore; Torrance, J. Kenneth; Lambert, J. D. H.; Arnason, T. J.; Baum, Bernard R.

doi:10.1007/bf02860796

Cited by 83 publications

(58 citation statements)

References 28 publications

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“…In low-input farming systems farmers often use a wide range of crop varieties, to provide harvest security, yield stability and the possibility to adapt to changing ecological conditions (Hardon and De Boef 1993;Teshome et al 1999). Farmers in these situations adopt modern varieties only to a limited extent, or not at all.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal dynamics in genetic diversity in upland rice and late millet (Pennisetum glaucum (L.) R. Br.) in The Gambia

Nuijten

Treuren

2007

Genet Resour Crop Evol

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Ambiguity exists about the level of genetic diversity represented by farmer crop varieties, how it develops over time and how it relates to the diversity comprised by formal varieties. As part of an interdisciplinary technological/sociological study on farmer management of gene flow, upland rice (Oryza sativa L.) and late millet (Pennisetum glaucum (L.) R.Br.) from The Gambia were investigated for morphological and molecular variation. The goal of these analyses was to obtain insight into the level of crop genetic diversity of farmer's materials planted in several case study villages in The Gambia. For both crops, samples were collected from villages and various research institutes. Based on variety names, different rice and millet varieties were expected to be used in different villages. In fact, there was a large overlap in genetic diversity for both crops, masked by the use of synonyms. The considerable similarity in rice genetic diversity between villages most likely results from the exchange of varieties between farmers. For millet this seems the result of development of varieties from the same gene pool. Some farmer varieties of rice, however, are apparent hybrid forms between the species O. sativa and O. glaberrima Steud., and farmer varieties in general displayed higher levels of genetic diversity than formal varieties. This indicates that, for rice, genetic diversity develops in farmers' fields and may have potential use in formal breeding programs.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal dynamics in genetic diversity in upland rice and late millet (Pennisetum glaucum (L.) R. Br.) in The Gambia

Nuijten

Treuren

2007

Genet Resour Crop Evol

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“…The analyses for quantitative traits revealed wide variability among the landraces. Previous studies (Teshome et al, 1999;Seboka and van Hintum, 2006;Shewayrga et al, 2008) reported that farmers purposely maintain and grow many landraces to address various needs as well as risk aversion strategy, and the landraces vary in maturity, yield potential, stress tolerance, end-use quality and other agronomic traits. Diversity studies in NE Ethiopia have also shown high diversity for other crop landraces including tef (Assefa et al, 2001;Kefyalew et al, 2000), barley (Abebe et al, 2010;Mekonnon et al, 2015) and durum wheat (Eticha et al, 2005;Mengistu et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Geographic patterns of phenotypic diversity in sorghum (Sorghum bicolor (L.) Moench) landraces from North Eastern Ethiopia

Desmae¹,

Jordan²,

Godwin³

2016

Afr. J. Agric. Res.

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Understanding the pattern of genetic variability is an important component of germplasm collection and conservation as well as the crop's improvement process including the selection of parents for making new genetic recombination. Nine hundred seventy four sorghum landraces from North Eastern (NE) Ethiopia were evaluated for agro-morphologic characters to assess geographic patterns of phenotypic diversity and to identify whether there are specific areas of high diversity for particular traits. The Shannon-Weaver diversity index (H′) for qualitative traits ranged from 0.30 to 0.93 (mean = 0.67) for grain covering and grain color, respectively. The landraces also displayed highly significant differences (p<0.01) for all the quantitative traits with days to flowering ranging from 64 to 157 days (range = 93), days to maturity from 118 to 215 (range=97) days, plant height from 115 to 478 cm; 1000-seeds weight from 18 to 73 g, and grain number from 362 to 9623. The first five principal component axes captured 71% of the total variation with days to flowering and maturity, leaf number and length, panicle weight, grain weight and number per panicle, panicle length, length of primary branches, 1000-seeds weight and internode length accounting for most of the variability. Cluster analysis grouped the landraces into ten clusters. The clustering of zones and districts revealed close relationship between geographic locations based on proximities and agro-ecological similarities. Differentiation analysis showed that most of the landraces variability was within rather than between geographic origins of the landraces, indicating weak genetic differentiation among landraces from predefined geographic origins such as political administrative zones and districts. The weak differentiation might be due to frequent gene flow across the study area because of seed exchanges among farmers.

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“…Those studies concerned varietal diversity in sorghum (Sorghum bicolor) (Mekbib 2008;Mulatu and Belete 2001;Teshome et al 1999), wheat (Triticum spp.) (Di Falco et al 2007;Kebebew et al 2001), finger millet (Eleusine coracana) (Tsehaye et al 2006), and tef (Eragrostis tef) (Assefa et al 2001).…”

Section: Agro-biodiversity and Soil Degradation Changes (2000-2005)mentioning

confidence: 99%

Spatial variation in biodiversity, soil degradation and productivity in agricultural landscapes in the highlands of Tigray, northern Ethiopia

et al. 2009

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Maintenance of sorghum (sorghum bicolor, poaceae) landrace diversity by farmers’ selection in Ethiopia

Cited by 83 publications

References 28 publications

Spatial and temporal dynamics in genetic diversity in upland rice and late millet (Pennisetum glaucum (L.) R. Br.) in The Gambia

Spatial and temporal dynamics in genetic diversity in upland rice and late millet (Pennisetum glaucum (L.) R. Br.) in The Gambia

Geographic patterns of phenotypic diversity in sorghum (Sorghum bicolor (L.) Moench) landraces from North Eastern Ethiopia

Spatial variation in biodiversity, soil degradation and productivity in agricultural landscapes in the highlands of Tigray, northern Ethiopia

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