Issali et al
Greener Journal of Agricultural Sciences Vol. 6 (7), pp. 234-238, August 2016.
Manuscript Number: 070916114
Influence of Red and Unred Phenotypes of the Coconut Seednuts Colour in Seedbed on the Expression of their Regeneration Level in Seedlings in Nursery, Côte d’Ivoire
Auguste Emmanuel Issali1*, Léonard Kouamé Kouadio1,2,
Assandé Ahoba3, Thierry Tacra Lekadou1, Jean Louis Konan1,4
1Station de Recherche sur le Cocotier Port Bouët Marc Delorme, CNRA, 07 BP 13 Abidjan 07, Côte d’Ivoire.
2Université Jean Lorougnon Guédé, BP 150, DALOA, Côte d’Ivoire.
3Station SRT, Centre National de Recherche Agronomique (CNRA), 08 BP 33 Abidjan 08.
4Centre National de Recherche Agronomique (CNRA), Direction Régionale d’Abidjan, 08 BP 33 Abidjan 08, Côte d’Ivoire.
In order to analyse the influence of the unred and red phenotypes of the seednuts colour and their regeneration level in seedlings, correlations between two nominal variables, namely the nut colour phenotype and its presence or lack within the regenerated seedlings, were tested. Two hundred and twenty four seednuts, whose 87 expressing the red phenotype and 137 the unred one, were buried in seedbed. A scale of notation conferring the note 0 to the red phenotype and 1 to the unred one was adopted. Likewise, in nursery, the same notations 0 and 1 were attributed to red and unred seedlings, respectively. Chi-square Independence and homogeneity non parametric tests at 5% likelihood were used. Results showed that the numbers of the unred and red phenotypes of the seednuts colour in seedbed were not balanced. This seemed to reveal that the samples did not come from the same parent population. Out of a total of 224 seednuts, 67 showing the red phenotype in seedbed were not able to regenerate in seedlings in nursery. In the same way, 44 seednuts revealing the unred phenotype did not succeed in regenerating in seedlings in nursery. In contrast, from the same number previously reported, 9 expressing the red phenotype in seedbed managed to regenerate in seedlings in nursery. Likewise, 104 seednuts expressing the unred phenotype were not able to regenerate in seedlings in nursery. Thus, the red phenotype was lowly regenerated while the unred one was highly regenerated in seedlings. The link strength between the colour phenotypes and the presence / lack of their regenerated seedlings in nursery, although average, was nonetheless very highly significant. Such a link seems to indicate that the 2 characters depend on an only and same gene pleiotropic. The rest of work, in a near future, will consist in searching for the correlations between the seednut colour phenotypes and the biochemical and physiological processes responsible for germination and regeneration in seedlings.
Keywords: correlation, nominal variable, notation scale, presence/absence, Chi-square homogeneity test, Chi-square independence test.
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