Changes in the diversity and geographic distribution of cultivated millet (Pennisetum glaucum (L.) R. Br.) and sorghum (Sorghum bicolor (L.) ... View Full Text


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Article Info

DATE

2009-03

AUTHORS

Gilles Bezançon, Jean-Louis Pham, Monique Deu, Yves Vigouroux, Fabrice Sagnard, Cédric Mariac, Issoufou Kapran, Aïssata Mamadou, Bruno Gérard, Jupiter Ndjeunga, Jacques Chantereau

ABSTRACT

Changes in the diversity of landraces in centres of diversity of cultivated plants need to be assessed in order to monitor and conserve agrobioversity—a key-element of sustainable agriculture. This notably applies in tropical areas where factors such as increased populations, climate change and shifts in cropping systems are hypothesized to cause varietal erosion. To assess varietal erosion of staple crops in a country subjected to various anthropogenic and natural environmental changes, we carried out a study based on a comparison of the diversity of pearl millet and sorghum varieties collected in 79 villages spanning the entire cereal-growing zone of Niger over a 26 year period (1976–2003). For these two crops, the number, name and type of varieties according to important traits for farmers were considered at different spatial scales (country, region, village) at the two collection dates. The results confirmed the high diversity of millet and sorghum varieties in Niger. No erosion of varietal diversity was noted on a national scale during the period covered. Some changes were observed but were limited to the geographical distribution of certain varieties. This highlights that farmers’ management can preserve the diversity of millet and sorghum varieties in Niger despite recurrent and severe drought periods and major social changes. It also indicates that rainfed cereal cropping systems in Niger should remain to be based on millet and sorghum, while reinforcing farmers’ seed systems. More... »

PAGES

223-236

References to SciGraph publications

  • 2006-09. Farmers’ Perception and Genetic Erosion of Tetraploid Wheats Landraces in Ethiopia in GENETIC RESOURCES AND CROP EVOLUTION
  • 2006-12. Farmers’ Management of Finger Millet (Eleusine coracana L.) diversity in Tigray, Ethiopia and Implications for on-Farm Conservation in BIODIVERSITY AND CONSERVATION
  • 2008-08. Diachronic (1979–2003) analysis of rice genetic diversity in Guinea did not reveal genetic erosion in GENETIC RESOURCES AND CROP EVOLUTION
  • 2008-05. Genetic erosion of sorghum (Sorghum bicolor (L.) Moench) in the centre of diversity, Ethiopia in GENETIC RESOURCES AND CROP EVOLUTION
  • 1993-12. Genetic variability among sorghum accessions from the Sahelian agroecological region of Burkina Faso in BIODIVERSITY AND CONSERVATION
  • 2007-11. Spatial patterns of diversity and genetic erosion of traditional cassava (Manihot esculenta Crantz) in the Peruvian Amazon: An evaluation of socio-economic and environmental indicators in GENETIC RESOURCES AND CROP EVOLUTION
  • 2000-10. Genetic diversity within and among landraces of pearl millet (Pennisetum glaucum) under farmer management in West Africa in GENETIC RESOURCES AND CROP EVOLUTION
  • 1991-04. A Farmer-based approach to conserving crop germplasm in ECONOMIC BOTANY
  • 2008-06. Role of seed flow on the pattern and dynamics of pearl millet (Pennisetum glaucum [L.] R. Br.) genetic diversity assessed by AFLP markers: a study in south-western Niger in GENETICA
  • 2002-06. Natural hazards and genetic diversity in rice in AGRICULTURE AND HUMAN VALUES
  • 1996-08. Estimating genetic erosion in landraces — two case studies in GENETIC RESOURCES AND CROP EVOLUTION
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10722-008-9357-3

    DOI

    http://dx.doi.org/10.1007/s10722-008-9357-3

    DIMENSIONS

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    22 schema:description Changes in the diversity of landraces in centres of diversity of cultivated plants need to be assessed in order to monitor and conserve agrobioversity—a key-element of sustainable agriculture. This notably applies in tropical areas where factors such as increased populations, climate change and shifts in cropping systems are hypothesized to cause varietal erosion. To assess varietal erosion of staple crops in a country subjected to various anthropogenic and natural environmental changes, we carried out a study based on a comparison of the diversity of pearl millet and sorghum varieties collected in 79 villages spanning the entire cereal-growing zone of Niger over a 26 year period (1976–2003). For these two crops, the number, name and type of varieties according to important traits for farmers were considered at different spatial scales (country, region, village) at the two collection dates. The results confirmed the high diversity of millet and sorghum varieties in Niger. No erosion of varietal diversity was noted on a national scale during the period covered. Some changes were observed but were limited to the geographical distribution of certain varieties. This highlights that farmers’ management can preserve the diversity of millet and sorghum varieties in Niger despite recurrent and severe drought periods and major social changes. It also indicates that rainfed cereal cropping systems in Niger should remain to be based on millet and sorghum, while reinforcing farmers’ seed systems.
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