|
Poor farmers in China are growing
more genetically modified plants than small farmers in any other developing
nation.
The
survey of China's laboratories identified over
50 plant species and more than 120 functional genes that scientists are
using in plant genetic engineering, making
China a global leader in the field.
The country is developing the
largest capacity to use biotechnology to modify crop plants outside of
North America and is targeting crops -- including cotton, rice, wheat, potatoes
and peanuts -- that get little attention in other parts of the world. The
amount of research and the number of scientists working on gene-modified
plants is "impressive."
"Regulators (in China)
approved 45 genetically modified plant applications for field trials,
65 for environmental release, and 31 for commercialization."
Genetic modification involves
transferring genes of one species to another to acquire certain characteristics,
such as hardiness or pest resistance. For example, scientists have spliced
spider venom
genes into corn and other food crops as a "natural pesticide"
to deter insects and birds from feeding on the
plants, and inserted fish "antifreeze" genes into tomatoes to
extend their growing season into winter.
There has been bitter debate
about the safety of genetically altered food, and some scientists warn
of a "Trojan gene" effect that could damage or destroy species
of plants or animals.
Worldwide sales of genetically
modified foods grew an estimated $75 million in 1995, when the first commercial
plantings occurred, to approximately $2.3 billion in 1999. More than 40
modified food plants have been marketed in the US for general use, most
of them corn and soy products.
With a staff of biotechnology
researchers that is approaching 2,000, and a 1999 budget of $112 million,
the developing world's other large biotechnology programs, in Brazil and
India, fall short of China's.
Presently, China's efforts
have largely been focused on Bt cotton -- cotton that has been genetically
modified to produce the bacteria-derived toxin Bacillus thuringiensis,
which protects growing plants from insect pests.
Although the report notes that
farmers using genetically modified crop plants have reduced their use
of pesticides, this may be a short-lived effect, she explained. Whether
a pesticide is manufactured biologically by the plant or applied by humans,
insects will eventually develop resistance to the pesticide.
Science
January 25, 2002;295:674-675
|