Variabilité physico-morphologique des racines tubéreuses de manioc (<i>Manihot esculenta</i> CRANTZ) cultivées sur ferralsol en zone de forêt d’Afrique de l’Ouest

Abstract

Variabilité physico-morphologique des racines tubéreuses de manioc cultivées sur ferralsol en zone de foret d'Afrique de l'Ouest.

Morpho-qualitative characterization of ten local cassava accessions (Manihot esculenta crantz) in Njomb, Cameroon

“…These differences and similarities between accessions could be attributed to the environment that in the current context of climate change would affect the phenotype of plants. This finding was illustrated by the characterization of these accessions at different physiological stages (two months, three months, 2 years) and is reinforced by the results of Kouadio et al (2014), which stipulate that the physical characters depend on the varieties and ecological conditions. Thus for the same accession one can have different characters depending on the culture area and time (here relative to the seasons).…”

“…High fractions of the accessions in relation to certain traits are observed and could suggest similarities at the genetic and therefore phenotypic level. This was supported by Kouadio et al (2014), who started that the similarity between the varieties can find an explanation in the existence of genetic proximity group. This proximity shows the links with gene exchange during sexual reproduction.…”

“…Nevertheless, this varietal richness of cassava could also be due to an excess of heterozygotes within the varieties (accessions). Indeed the variability of the characters could be explained by the result of the crossing between two different individuals by a certain number of characters which are re-associated in a descending individual (Kouadio et al, 2014). Moreover, there were links of similarities between the accessions.…”

“…This variation of the averages observed can be explained by a genetic heterogeneity of the ten accessions of cassava. According to Kouadio et al (2014), physical characteristics such as diameter, length, number of tubers per plant and individual fresh weight of tubers depends on the varieties and ecological conditions.…”

“…It is marketed fresh or after several stages of processing into many products for human food (gari, attiéké, foufou) or animal food (chips, flour) is a source of income for farmers. In the industry, it is used for the manufacture of products such as starch, glues and dextrins (Kouadio et al, 2014). Cassava cultivation is threatened by pests, weeds and edaphic agronomic and socio-economic factors which are responsible for the drop in yields at 6.4 tons per hectare compared to a world average of 8.8 tons per hectare.…”