Tewodros and Getachew
Greener Journal of Agricultural Sciences Vol. 3 (9), pp. 693-704, September 2013.
Manuscript Number: 073113767
Agronomical Evaluation of Aerial Yam/ Dioscorea bulbifera/ Accessions collected from South and Southwest Ethiopia
Tewodros Mulualem*, Getachew WeldeMichael
Jimma Agricultural Research Center, P.O. Box 192 Jimma, Ethiopia.
*Corresponding Author’s Email: tewodros74 @ yahoo.com,
Tel. +251 9 11748530
The experiment was conducted at Jimma Agricultural Research
center. The objectives of the study were to estimate the
level of diversity within collected accessions based on key
agronomic trait(s) that can be used for selection of aerial
yam accessions for high root yield and evaluate the
accessions based on root yield and other related trait. A
total of 47 accessions of aerial yam were tested in
randomized complete block design with three replications.
Both qualitative and quantitative data collected were
subjected to multivariate analysis using principal component
(PCA), cluster analysis and analysis of variance to
determine the variability of accessions. The results of PCA
based on qualitative traits indicated that traits have good
contribution to the variability. The two-dimensional plot of
the first two PCs showed a separation between accessions in
big sized. Cluster analysis based on qualitative characters
showed the creation of six distinct groups with different
sizes and presence of variability, based on their above and
below ground plant parts. The result of Shannon-Weaver
diversity index (H’=0.18) showed low levels of diversity
between aerial yam accessions. Analysis of variance
indicated that tuber length, tuber diameter and vine length
have highly significant (P>0.01) differences exists for most
of the characters studied. Estimate of phenotypic and
genotypic coefficients of variation also showed the presence
of variability among the accessions for the a limited number
of the characters namely, vine length, vine dry weight,
tuber length and tuber diameter. Relatively high phenotypic
(53.96, 44.99 and 26.07 %) and genotypic coefficients of
variation (12.44, 22.81 and 11.18%) were observed for vine
dry weight, tuber dry weight and vine fresh weight in the
order of magnitudes. Heritability (39.69% and 25.70%)
coupled with genetic advance as percent of mean (12.42% and
23.83%) were recorded for vine length and tuber dry weight
per plot, respectively. Path coefficient analysis revealed
that that vine dry weight (p =1.203) and leaf length (p
=1.1949) was more important than other traits, hence can be
used as a criterion for indirect selection. Therefore,
selections based on vine dry weight and leaf length are
vital to increase the yield and the genetic improvement of
this crop. The overall results of this study showed that
aerial yam accessions collected from south and southwestern
Ethiopia have an enormous wealth of traits variation,
indicating huge potential for its genetic improvements
through selection and hybridization.
Keywords: Aerial yam, Cluster, Genetic Diversity, Principal Component.
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