Australia
April 5, 2005
In a world first
CSIRO Food Futures Flagship
has developed plants that produce DHA, a healthy omega-3 oil
component normally only available from fish sources, and vital
for human health.
"Showing
that plants can produce DHA in their seeds is a remarkable
scientific feat," says Dr Bruce Lee, Director of the CSIRO Food
Futures Flagship responsible for the project.
"It is an
important first step towards improving human nutrition, reducing
pressure on declining fish resources worldwide and providing
Australian grain growers with new high-value crops."
DHA and
other long-chain omega-3 fatty acids are made by lower plant
forms, like microalgae, which are then acquired by fish through
the food chain, but more advanced plants that grow on land
cannot produce them.
"The
prototype plants we developed show for the first time that land
plants can indeed make their own DHA and other important
long-chain omega-3 fatty acids when we equip them with the
required genes," says research team leader of Food Futures
Advanced Genetics, Dr Allan Green.
DHA is vital
for optimal brain and eye development and is recognised for its
health attributes including; lowering coronary heart disease
risk, Type-2 diabetes, Alzheimer's disease and asthma.
Nutritional
authorities recommend a daily intake of at least 500mg of
long-chain omega-3 including DHA, yet dietary surveys show that
most Australians consume only a tenth of this amount.
To increase
intake, many foods are now supplemented with omega-3 oils from
fish, but with declining natural fish stocks, and aquaculture's
current reliance on fish-based feeds, additional sources of
long-chain omega-3 oils are urgently needed.
"Commercially available omega-3 enriched crop plants may be some
years away, but they would enable the average Australian to
obtain healthier levels of DHA through a wider choice of foods,"
says Dr Green.
Dr Lee says
that this discovery is an example of the successful
collaboration of multi-disciplinary science drawing together
CSIRO's expertise across the different CSIRO divisions of Plant
Industry, Marine Research, Health Sciences & Nutrition,
Entomology, Livestock Industries, and Food Science Australia (a
joint venture of CSIRO and the Victorian Government).
"This result
positions Australia at the forefront of global grain research
and innovation." |