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Morphological variability of greater yam (Dioscorea alata L.) in Malaysia

Published online by Cambridge University Press:  01 April 2008

Sayed M. Zain Hasan ,
Andrew A. Ngadin ,
Ramisah M. Shah  and
Norizan Mohamad
Sayed M. Zain Hasan*
Affiliation:
Faculty of Agro-technology and Food ScienceKolej Universiti Sains dan Teknologi Malaysia (KUSTEM), 21030 Mengabang Telipot, Kuala Terengganu, Malaysia
Andrew A. Ngadin
Affiliation:
Faculty of Agro-technology and Food ScienceKolej Universiti Sains dan Teknologi Malaysia (KUSTEM), 21030 Mengabang Telipot, Kuala Terengganu, Malaysia
Ramisah M. Shah
Affiliation:
Faculty of Agro-technology and Food ScienceKolej Universiti Sains dan Teknologi Malaysia (KUSTEM), 21030 Mengabang Telipot, Kuala Terengganu, Malaysia
Norizan Mohamad
Affiliation:
Faculty of Science and Technology, Kolej Universiti Sains dan Teknologi Malaysia (KUSTEM), 21030 Mengabang Telipot, Kuala Terengganu, Malaysia
*
*Corresponding author. E-mail: sayed@kustem.edu.my
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Abstract

An assessment of morphological variation among 70 accessions of greater yam (Dioscorea alata L.) collected throughout Malaysia was made. Data of 47 morphological variables measured from the accessions were subjected to multivariate analysis using principal component (PCA) and cluster analysis (CA). The PCA results indicated that the characters contributing largely to the species variability were those related to the shape, size and flesh colour of underground tubers; shape and colour of aerial tubers; position, shape, size and vein colour of the leaves; petiole colour; shoot growth rate; and number of days for shoots to germinate. The two-dimensional plot of the first two PCs showed a separation between accessions of purple tuber groups and those of white tuber groups, but was unable to distinguish accessions according to tuber shape groups, i.e. irregular, oblong and round, as revealed by visual observation. The dendrogram of CA revealed four major groups of D. alata in Malaysia, which supported the PCA grouping. This study demonstrated that D. alata in Malaysia consists of numerous genotypes revealing wide inter- and intra-group variability.

Keywords

Dioscorea alata Lmorphological traitsmultivariate analysisvariability
Type
Research Article
Information
Plant Genetic Resources , Volume 6 , Issue 1 , April 2008 , pp. 52 - 61
Copyright
Copyright © NIAB 2008

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