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 user 2007-04-26 at 11:42:00 am Views: 42
  • #18318

    Plant vault passes billion mark

    Britain’s “Noah’s Ark” for plants has just collected its billionth seed.

    The Millennium Seed Bank will present the seed, from an African bamboo,
    to Chancellor Gordon Brown, as it seeks funds to continue operating
    after 2010.

    Part of the Royal Botanic Gardens (RBG) at Kew, the
    bank already stores material from 18,000 species, some of which have
    become extinct in the wild.

    Seed banks are seen as an essential part of plans to curb the rapid loss of biodiversity, in Britain and worldwide.

    If policymakers are serious about funding adaptation to climate change, seed banks are a key part of that

    Paul Smith

    By 2010, Kew plans to have amassed seeds from 30,000 species, representing 10% of the world’s plants.

    “Now we’re starting to think about where we go beyond 2010,” the project’s head Paul Smith told the BBC News website.

    “And we want to get to 25% of species stored away by 2020. If
    policymakers are serious about funding adaptation to climate change,
    seed banks are a key part of that.”

    Dry world

    Seeds are collected by Kew’s partner organisations around the world and sent to the RBG site at Wakehurst Place in Sussex.

    They come from all over the globe, although British varieties are
    particularly well represented, with seeds from 88% of its native flora
    sequestered away.

    Most of the seeds can be preserved by careful drying, after
    which they are stored at minus 20C. A few need more specialised,
    tailor-made treatment.

    Some will last like this for millennia, others for
    decades; these will be planted and germinated before their expiry date
    comes up, and the seed of their offspring collected and stored anew.

    But the idea is not to hide them away for ever. Where
    species have gone extinct, or are teetering on the edge, Kew’s stores
    are used to replenish wild populations.

    One British example is strapwort

    (Corrigiola litoralis)

    , a critically endangered native of southwest England now found on only
    one nature reserve, which Kew’s stocks are helping to keep alive.

    Minimum investment

    The billionth seed comes from the African bamboo species

    Oxytenanthera abyssinica,

    a plant used in Mali and other West African countries for building, furniture, and wine-making.

    Its presentation to Mr Brown is aimed at persuading the Chancellor and
    prospective Prime Minister to continue funding the Millennium Seed Bank
    after 2010.

    It is a key year in conservation, marking the target date
    by which, under the UN biodiversity convention, the world’s governments
    are pledged to have halted and begun to reverse the seemingly
    inexorable biodiversity decline.

    “Scientists are always asking for money,” conceded Dr
    Smith. “But what makes us different is that we have a proven
    methodology here, we have the network and we know how to do what we do.

    “This costs about £2,000 ($4,000) per species; so to collect a quarter of what’s out there would cost about £100m ($200m).

    “With threats not only from climate change but also deforestation,
    changes in land use and so on, seed-banking is the bare minimum.”