Genetic Diversity of First Sugarcane Varieties of Reunion-Ivorian Origin Preselected in Ferké, Ivory Coast Objectives: The overall study objective was to contribute to sugarcane yield improvement in Ivory Coast. It aimed to characterize the genetic diversity of the first batch of 148 sugar cane varieties of Reunion-Ivorian origin preselected at the "one-row" stage for standard selection trials of 1st and 2nd stages to be carried out under Ferké commercial field conditions. Methodology and results: It was conducted on Ferké 2 experimental station under full sprinkler irrigation in northern Ivory Coast. These varieties were pre-selected in 1st regrowth among 985 clones planted per family, one individual per row 3 m long without repetition and compared to a control variety (SP70-1006).That one was replicated several times every 5 rows to ease agronomics observations of clones in comparison with the control. Quantitative as well as qualitative traits observed at the age of 10 months were subjected to a series of multivariate analyses. The study showed that quantitative traits, which better explained diversity of varieties, were the following in decreasing order: flowering rate, number of millable stalks/3m, stalk diameter, and stalk height. Those phenotypic traits highly contributed to discrimination of varieties into 8 clusters, which suggested a good genetic diversity among all 148 preselected clones. Four best-represented clusters (63.5 % of total) comprised 20-30 individuals each, whereas less represented clusters (36.5 %) involved 11-15 individuals each. Conclusion and application of results: Quantitative traits most relevant in variety clustering were high tillering, moderate tillering, erect traits, which were associated respectively with clusters G1, G7 and G2. As for lodging traits, they were associated with 6 clusters all together, namely G2, G3, G4, G5, G6 and G8. The genetic variability so shown is a prerequisite for further selections trials under commercial field conditions.
Specific objective was to evaluate the genetic diversity of sugarcane clones preselected at one-row stage as plant crop. Methodology and results : It was conducted on Ferké 1 experimental station under full covering sprinkler irrigation in northern Ivory Coast. The genotypes were preselected as plant cane among 863 clones planted one raw of 3m/clone following families, without replication and compared to control variety SP70/1006. Quantitative as well as qualitative traits observed were subjected to a series of multivariate analyses. It came out that quantitative traits which better explained diversity of genotypes were the following in decreasing order : average stalk weight, stalk diameter, number of millable stalks/3m, stalk height and brix. Those phenotypic traits highly contributed to discrimination of varieties into 10 clusters which suggested a good genetic diversity among genotypes. Most relevant qualitative variables in the discrimination of clusters concerned tillering density and flowering intensity. Conclusion and application of results : Quantitative traits most relevant in genotype clustering were average stalk weight, stalk diameter, number of millable stalks/3m, stalk height and brix. Most relevant qualitative variables in genotype clustering concerned tillering density and flowering intensity. The genetic variability so shown in plant cane needs to be verified especially in 1rst ratoon cane before final preselection of genotypes required for the last two stages of screening under commercial field conditions.
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