Interactions entre la variabilité des écotypes de l'oignon (Allium cepa L.) et les facteurs agro-climatiques

Interaction between Onion Ecotypes Variability and Agroclimatics Factors in Niger. The onion is the most important vegetable crop grown in Niger. Annual production is estimated at 561,000 tons, ranking the country at the second place of onion producers of the West Africa behind Nigeria. A collection of local cultivars of onion of Niger was conducted in 2008. This survey was followed by a study of their interaction with the agro-climatic factors. Conventional methods of collection of plant material (mentioning of the location of collection sites on the map, identification and description of samples, history of ecotypes, growing conditions, etc.) were used. The varietal aspect of different collection was highlighted. Twenty-one local ecotypes including the "Violet de Galmi" were collected. The results also revealed interaction between some varietal characteristics such as bulb color, life cycle and agro-climatic and geomorphological factors of the collection sites.