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Re-defining the yam (Dioscorea spp.) core collection using morphological traits

Published online by Cambridge University Press:  03 May 2017

Gezahegn Girma ,
Ranjana Bhattacharjee ,
Antonio Lopez-Montes ,
Badara Gueye ,
Sam Ofodile ,
Jorge Franco  and
Michael Abberton
Gezahegn Girma
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
Ranjana Bhattacharjee*
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
Antonio Lopez-Montes
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
Badara Gueye
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
Sam Ofodile
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
Jorge Franco
Affiliation:
Departamento de Biometría, Estadística y Computación, Facultad de Agronomía, UDELAR, Ruta 3, Km. 363, Paysandú, Uruguay
Michael Abberton
Affiliation:
International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria
*
*Corresponding author. E-mail: [email protected]
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Abstract

Development of core collection representing the diversity in the entire germplasm creates a better access and enhanced utilization of the main collection thus allowing rapid evaluation in crop improvement programs. Core collections are dynamic in nature and needs revisiting when additional germplasm and information becomes available. In the current study, an attempt was made to re-define the previously developed yam (Dioscorea spp) core collection using 56 morphological traits. Information on additional acquired germplasm and presence of duplicates or mislabelled accessions in the entire collection was also used. The re-defined core collection consisted of 843 accessions and represented about 20% of the entire collection. It included six Dioscorea species, of which accessions of Dioscorea rotundata are in the majority (73.54%) followed by Dioscorea alata (21.35%), Dioscorea bulbifera (1.66%), Dioscorea cayenensis (1.42%), Dioscorea dumetorum (1.42%) and Dioscorea esculenta (0.59%). The Shannon weaver diversity index and principal component analysis revealed the maximum diversity captured in the core from the base collection. This re-defined core collection is more valuable than the original core since it represents true-to-type accessions ensuring reliability for enhanced utilization of germplasm in yam improvement programs.

Keywords

core collectionDioscoreamorphological traitsphenotypic diversityyam
Type
Research Article
Information
Plant Genetic Resources , Volume 16 , Issue 3 , June 2018 , pp. 193 - 200
Copyright
Copyright © NIAB 2017 

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