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    Genome-wide diversity and structure variation among lablab [Lablab purpureus (L.) Sweet] accessions and their implication in a forage breeding program

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    Journal Article (2.356Mb)
    Date
    2021
    Author
    Sserumaga, J.P.
    Kayondo, S.I.
    Kigozi, A.
    Kiggundu, A.
    Namazzi, C.
    Walusimbi, K.
    Bugeza, J.
    Molly, A.
    Mugerwa, S.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Most orphan crops have not been fully sequenced, hence we rely on genome sequences of related species to align markers to different chromosomes. This hinders their utilisation in plant population improvement programs. Utilising the advances in the science of sequencing technologies, the population structure, relatedness, and genetic diversity among accessions can be assessed quickly for better exploitation in forage breeding programs. Using DArTseq technology, we studied the genetic and structural variation in 65 Lablab purpureus (L.) Sweet conserved gene-bank accessions using 9320 DArTseq-based SNPs and 15,719 SilicoDart markers. These markers had a low discriminating ability with mean polymorphic information content (P.I.C.) of 0.14 with DArTseq-based SNPs and 0.13 with SilicoDart markers. However, the markers had a high mean call rate of 73% with DArTseq-based SNPs and 97% with SilicoDart markers. Analysis of molecular variance revealed a high within populations variance (99.4%), indicating a high gene exchange or low genetic differentiation (PhiPT = 0.0057) among the populations. Structure analysis showed three allelic pools in variable clusters of ΔK = 3 and 6. Phylogenetic tree of lablab accessions showed three main groups with variable membership coefficients. Most pairs of accessions (40.3%) had genetic distances between 0.10 and 0.15 for SilicoDart markers, while for DArTseq-based SNPs, (46.5%) had genetic distances between 0.20 and 0.25. Phylogenetic clustering and minimum spanning analysis divided the 65 accessions into three groups, irrespective of their origin. For the first time, this study produced high-density markers with good genom coverage. The utilisation of these accessions in a forage program will base on the information from molecular-based grouping. The outcomes uncovered the presence of noteworthy measure of variety in Uganda, CIAT and ILRI accessions, thus demonstrating an opportunity for further marker-trait-association studies.
    Acknowledgements
    The authors would also like to thank ILRI, Adisi Ababa AND CIAT Columbia for making their germplasm available for the study. Also BecA-ILRI hub for genotyping services.
    https://dx.doi.org/10.1007/s10722-021-01171-y
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7772
    IITA Authors ORCID
    Kayondo Siraj Ismailhttps://orcid.org/0000-0002-3212-5727
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1007/s10722-021-01171-y
    IITA Subjects
    Agronomy; Biodiversity; Crop Systems; Forestry; Plant Breeding; Plant Genetic Resources; Plant Production
    Agrovoc Terms
    Plant Genetic Resources; Genetic Variation; Genetic Diversity; Single Nucleotide Polymorphism; Uganda
    Regions
    Africa; East Africa
    Countries
    Uganda
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Genetic Resources and Crop Evolution
    Collections
    • Journal and Journal Articles4835
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