September 22, 2008
by Katherine Nightingale,
SciDevNet
An international foundation is
funding a drive to screen thousands of crops for traits that
will be useful in adapting food production to climate change.
The
Global Crop Diversity Trust
is providing around US$300,000 of funding this year for
researchers in 21 agricultural institutions in 15 countries
across the developing world. Around US$200,000 will be spent
next year with a continued commitment in the long term.
Crops from banana to sweet potato will be screened to identify
material that plant breeders can use to produce varieties
adapted to conditions associated with climate change.
Crop diversity is the biological foundation of agriculture, says
Cary Fowler, executive director of the trust.
"Without it agriculture cannot adapt to anything: pests,
disease, climate change, drought, energy constraints … nothing.
With crop diversity we can have an agricultural system that — if
we're smart — is sustainable and productive, can feed people and
fuel development."
Researchers will screen the crops by growing them in different
stress conditions — such as high salinity or high temperature —
and assessing how well they grow.
Varieties with positive traits will be put into an open access
database, says Fowler.
Some will also be entered into a 'pre-breeding' programme.
Integrating one or two genes from an old or wild variety into a
modern variety is costly and difficult, says Fowler, and
pre-breeding produces early-stage, new varieties with the
desired traits, so that plant breeders can get a 'head start' on
producing varieties for farmers' fields.
"Plant breeders often have to make quick progress so they're
loathe to get involved in the kind of cutting edge research to
put exotic traits in [a crop]. So the pre-breeding at least gets
that first set of genes into some kind of form that is easier
for a plant breeder."
Funded projects include a scheme in Papua New Guinea to screen
over 20 varieties of the root crop taro for drought and salinity
resistance. Taro is particularly important to the poor island
communities of the Pacific region, as it need not be harvested
for a number of years, making for a sustainable source of food
and an 'insurance policy' at times when the prices of other
staple crops become too high.
A programme in Bangladesh will screen varieties of the grass
pea, a hardy crop that is often the only crop left in times of
environmental stress and grown by the poorest communities.
Long-term consumption of grass pea can lead to paralysis, as the
plant produces a neurotoxin — giving people a choice between
starvation or paralysis. Researchers will search for varieties
with low levels of this neurotoxin. |
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