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A global overview of cassava genetic diversity

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Title A global overview of cassava genetic diversity
 
Creator Ferguson, M.
Shah, T.
Kulakow, P.
Ceballos, H.
 
Subject CASSAVA
GENETIC DIVERSITY
GERMPLASM BANKS
DISEASE RESISTANCE
 
Description Open Access Journal
Although numerous studies of diversity have been conducted in cassava, there is no comprehensive assessment of global genetic diversity. Here we draw on previous studies and breeders’ knowledge to select diversity sets from the International Institute of Tropical Agriculture (IITA) and the International Center for Tropical Agriculture (CIAT) genebanks and breeders’ germplasm, as well as elite germplasm and landraces from eastern, southern and central (ESC) Africa to make a global assessment of diversity in cassava, using a SNP based GoldenGate (Illumina Inc.) assay. A synthesis of results from genetic distance and ADMIXTURE analysis essentially revealed four populations (i) South American germplasm characterised by relatively higher genetic diversity with hypothetical ancestral founder genotypes from Brazil, (ii) a smaller group of African introduction germplasm which is more distantly related to all other germplasm, (iii) West Africa germplasm dominated by IITA breeding lines, containing sources of cassava mosaic disease resistance, and IITA genebank accessions from West Africa, both characterised by slightly lower diversity, and (iv) a less cohesive group of African germplasm, termed ‘Other’, with moderate levels of diversity and a majority of germplasm from ESC Africa. This study highlights opportunities for heterosis breeding, purging of duplicates in genebanks and the need for conservation of ESC Africa landraces.
Generation Challenge Program
Peer Review
 
Date 2019-11-14T15:54:17Z
2019-11-14T15:54:17Z
2019-11-06
 
Type Journal Article
 
Identifier Ferguson, M., Shah, T., Kulakow, P. & Ceballos, H. (2019). A global overview of cassava genetic diversity. PLOS ONE, 14(11): e0224763, 1-16.
1932-6203
https://hdl.handle.net/10568/105742
 
Language en
 
Rights CC-BY-4.0
 
Format 1-16
 
Source PLOS ONE