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    Further evidence that the Genebank standards for drying orthodox seeds may not be optimal for subsequent seed longevity

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    U18ArtWhitehouseFurtherInthomDev.pdf (501.6Kb)
    Date
    2018-10-12
    Author
    Whitehouse, K.J.
    Owoborode, O.F.
    Adebayo, O.O.
    Oyatomi, O.A.
    Olaniyan, A.B.
    Abberton, M.T.
    Hay, F.R.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Maximizing seed longevity is important for genebanks to efficiently manage their accessions, reducing the frequency of costly regeneration cycles and the loss of genetic integrity. Research on rice seeds has shown that subsequent longevity in air-dry storage can be improved by drying seeds, which are metabolically active at harvest (moisture contents above a critical value close to 16.5%), for an initial period at a higher temperature (40°C–60°C) than that currently recommended by the current genebank standards (5°C–20°C). The aim of this study was to test whether similar benefits could be achieved in two legume species—cowpea and soya bean—by drying freshly harvested seeds, from two separate harvests, at 40°C and 35% relative humidity, for up to 8 days before equilibrium drying in a drying room (17°C and 15% relative humidity). Improvements in longevity were observed in three of the four accessions of soya bean, with the greatest improvement generally occurring after the maximum duration (8 days) at the higher temperature. However, of the five accessions of cowpea, only seeds of TVu-9698 and TVu-13209 from the first harvest, and of TVu-13193 from the second harvest, showed an improvement in longevity compared with drying following the standard protocol. A negative effect of high-temperature drying was also observed in one accession of cowpea, TVu-11980, but only in seeds harvested later in the season, 13 weeks after planting. This research not only provides evidence of the potential benefits of drying orthodox seeds at an alternative, higher, temperature instead of at the conventional lower temperature, before long-term storage, but also raises awareness of how genebanks can improve the management of their accessions.
    https://dx.doi.org/10.1089/bio.2018.0026
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/4629
    Non-IITA Authors ORCID
    Michael Abbertonhttps://orcid.org/0000-0003-2555-9591
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1089/bio.2018.0026
    Research Themes
    BIOTECH & PLANT BREEDING
    IITA Subjects
    Genetic Improvement; Grain Legumes; Plant Breeding
    Agrovoc Terms
    Seed Longevity; Cowpeas; Soybeans; Gene Banks
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Journals
    Biopreservation and Biobanking
    Collections
    • Journal and Journal Articles4835
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