Multivariate analysis of genetic diversity in kenaf, Hibiscuscannabinus (L.)

African Crop Science Journal Vol.5. No.2, pp. 127-133, 1997Multivariate analysis of genetic diversity in kenaf, Hibiscuscannabinus (L.) B. A. OGUNBODEDE Code Number: CS97019 Sizes of Files:Text: 24.5K Graphics: Line drawings (gif) - 9.9K ABSTRACT Fifty-four(54) accessions of kenaf of diverse eco-geographical origins wereevaluated in an 8 x 8 lattice design in three environments insouth-western Nigeria. Two multivariate techniques - the coefficient ofracial likeness (CRL) and principal component analysis (PCA) were usedto assess the extent of genetic divergence among the accessions. TheCRL distances for the 1431 possible pairs of accessions were each lessthan 2.0. This does not necessarily suggest lack of genetic diversityamong the accessions. The first three principal axess accounted for67.17% of the total variation among the accessions. From atwo-dimensional ordination of the first two principal axes, sixclusters can be identified. Clustering was closely related to averageCRL values and there was no relationship between clustering andeco-geographical distributions. The analysis of CRL values showed thatbutt-diameter and fiber yield each accounted for 13.0% of the variationdetected in the accessions. Plant height and retting percentage eachcontributed 11.3% while core weight, number of leaves per plant, corepercentage and fresh plant weight contributed 12.5, 10.3, 10.2 and10.0%, respectively. The implications of these findings in kenafimprovement programmes are discussed. Key Words: Coefficient of raciallikeness. genetic diversity, principal component analysis RESUMECinquante-quatre (54) echantillons de kenaf provenant de differentsmilieux geographiques ont ete evalues dans un quadrat de 8 x 8placettes dans trois environnements du sud-ouest du Nigeria. Deuxtechniques multivariees - le coefficient de similitude raciale (CRL) etl'analyse de la composante principale (PCA) ont ete utilisees pourevaluer l'importance de la divergence entre les echantillons. Lesdistances CRL de 1431 paires d'echantillons possibles se sont seveleestoutes inferieures a 2.0. Cela ne signifie pas necessairement un manquede diversite genetique entre les echantillons. Les premiers troisprincipaux axes representaient 67.17% de la variation totale entre lesechantillons. A partir d'une ordination a deux dimensions de deuxpremiers principaux axes, on peut identifier six groupes. Le groupageetait etroitement lie aux valeurs moyennes CRL. Il n'y avait donc pasde lien entre le groupage et les distributions eco-geographiques.L'analyse des valeurs CRL a montre que le diametre des souches et laproduction totale de fibre representaient 13.0% de la variationdetectee parmi les echantillons. La hauteur de la plante et lepourcentage total de l'evaluation ont contribue chacun pour 11.3%. Parcontre, le poids de la partie centrale, le nombre de feuilles parplante, le pourcentage de la partie centrale et la poids frais de laplante ont contribue pour 12.5, 10.3, 10.2 et 10.0% respectivement. Lesimplications de ces resultats dans les programmes d'amelioration dukenaf sont discutes. Mots Cles: Coefficient de similitude raciale,divernsite genetique, analyse de la composante principale Copyright1997 The African Crop Science Society