Development of West African yam Dioscorea spp. core collection

Mahalakshmi, V.; Ng, Q.; Atalobhor, J.; Ogunsola, D.; Lawson, Mark; Ortíz, Rodomiro

doi:10.1007/s10722-007-9236-3

Cited by 7 publications

(9 citation statements)

References 14 publications

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“…The development of core collections representing the diversity of the entire germplasm (Frankel & Brown, ) facilitates easy access and enhances the utilization of the main collection for fast evaluation in crop improvement programmes. The first core collection (391 accessions) from the IITA yam germplasm represented 75% of the morphological diversity of the entire collection using data on 77 morphological descriptors and country of origin (Mahalakshmi et al, ). This core collection represented 13% of the entire collection.…”

Section: Germplasm Resources For Yam Improvementmentioning

confidence: 99%

Review of empirical and emerging breeding methods and tools for yam (Dioscorea spp.) improvement: Status and prospects

et al. 2019

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Yam (Dioscorea spp.) is an important tuber crop with tremendous potential as a functional food in the tropics and subtropics. However, the crop has not shown progressive productivity gain over decades due to various production constraints. This paper reviews the progress achieved in empirical breeding endeavours and the development, status and application of emerging breeding tools and technologies to translate genetic gains in yam improvement. Significant progress has been made in yam genetic improvement over the years which has led to the identification and development of several improved clones and sources of variability for various economically important traits. Substantial efforts have also been made to develop diverse molecular markers, transcriptome and metabolome profiles of crucial traits, trait mapping and generate reference genome sequences of the key species. However, there seems to be a slow translation of research improvements into widespread applications. These advances and the integration of empirical and emerging methods and technologies into the breeding process will enhance yam breeding efforts and ensure the quick delivery of improved varieties that possess superior agronomic and quality traits.

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Section: Germplasm Resources For Yam Improvementmentioning

confidence: 99%

Review of empirical and emerging breeding methods and tools for yam (Dioscorea spp.) improvement: Status and prospects

et al. 2019

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“…This study showed that, in Brazil, yam (D. cayenensis/ D. rotundata) cultivation occurs mainly by farmers practising family farming, usually using the swidden fields as a planting unit, similar to what happens in some countries in Africa, where the centre of origin and diversity of these species is located (Mahalakshmi et al, 2007). The swidden fields are of fundamental importance for the conservation of biodiversity, since several multi-purpose species are usually cultivated and a high diversity is observed (Scarcelli et al, 2006;Peroni et al, 2007;Amorozo, 2008).…”

Section: Discussionmentioning

confidence: 61%

Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

Silva¹,

Mezette

Nascimento

et al. 2016

Plant Genet. Resour.

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Yams (Dioscorea spp.) are one of the main root and tuber crops in the world, especially within the species complex Dioscorea cayenensis/D. rotundata. Few studies have been conducted in Brazil with these species, including genetic diversity. The objective of this study was to characterize the genetic diversity of local varieties of D. cayenensis and D. rotundata using morphological and molecular markers, and provide information on the management and use of the crop by family farmers from different regions in Brazil. Thus, yam tubers were sampled from several municipalities in the South, Southeast and Northeast regions. Eighteen morphological traits and ten microsatellite loci were used to analyse 47 yam accessions (23 D. cayenensis and 24 D. rotundata). Species identification was carried out after field morphological evaluation. Spatial genetic analysis indicated significant structure among the local varieties, mostly between regions and species. Both cluster and Bayesian analyses showed a separation of the accessions into two distinct groups: group I with accessions originated from the Southeast region and group II with accessions originated from the Northeast region, while accessions from the South region were intermediate or included in either group. The results showed a separation between D. cayenensis and D. rotundata accessions in Brazil, and that D. cayenensis occurs predominantly in the Southeast region, while D. rotundata occurs in the Northeast region. Further studies with larger sampling would be welcome in order to confirm these findings. Also, this study highlights the importance of family farmers in the genetic diversity conservation of these species in Brazil.

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“…A core collection was previously developed for yams by Mahalakshmi et al . (2007). However, a later study showed significant percentage of mislabelling and mixture of tubers within accessions (Girma et al ., 2012).…”

Section: Discussionmentioning

confidence: 99%

“…To overcome these challenges and facilitate easy access to germplasm collections, Frankel and Brown (1984) introduced the concept of core collection representing about 10% of the entire collection and capturing 70% of the diversity. A core collection of yam was developed by Mahalakshmi et al (2007), consisting of 371 (12.3%) of 3017 accessions representing eight different species collected from 11 West and Central African countries. Recently, additional germplasm have been acquired (453 accessions from Benin and Togo) and information on presence of duplicates and mislabelling was generated through a study on mismatch identification among the entire collection indicating a large discrepancy of about 20% (119 out of 371 accessions were mismatched) (Girma et al, 2012) across individuals within accession.…”

Section: Introductionmentioning

confidence: 99%

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

Girma

Bhattacharjee

Lopez-Montes

et al. 2017

Plant Genet. Resour.

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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.

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Development of West African yam Dioscorea spp. core collection

Cited by 7 publications

References 14 publications

Review of empirical and emerging breeding methods and tools for yam (Dioscorea spp.) improvement: Status and prospects

Review of empirical and emerging breeding methods and tools for yam (Dioscorea spp.) improvement: Status and prospects

Spatially structured morphological and molecular diversity amongDioscorea cayenensisandD. rotundatayam accessions

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

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