GE Grass Spreads Genetic Pollution over Large Distances

>From Grist Magazine <www.grist.org>

HAVE MODIFIED GENES, WILL TRAVEL
Genetically modified plants spreading hither and thither

Genes from genetically modified grass can spread much farther than
previously believed, according to a new study in the journal
Proceedings of the National Academy of Sciences. The study focused
on a new strain of creeping bentgrass -- commonly used on golf
courses for its resilience -- developed by two companies, Monsanto
and Scotts, to be resistant to the common herbicide Roundup.
Critics, including enviro groups, the U.S. Forest Service, and the
Bureau of Land Management, have worried that the pollen from
bentgrass, which is extremely light, will spread where it's not
wanted and possibly create herbicide-resistant "superweeds." In the
study, scientists at the U.S. EPA found that the GM bentgrass
pollinated plants as far away as they measured, up to 13 miles
downwind. The new results could set back plans by biotech companies
to develop GM grasses for residential use. In other creepy news,
Chinese scientists have complained that the millions of GM trees
planted to combat desertification are essentially untracked and are
so widely planted that, in the words of one scientist, "pollen and
seed dispersal cannot be prevented." It's a GM world now, folks!

straight to the source: The New York Times, Andrew Pollack, 21 Sep 2004
<http://www.grist.org/cgi-bin/forward.pl?forward_id=3119>

straight to the source: New Scientist, Fred Pearce, 20 Sep 2004
<http://www.grist.org/cgi-bin/forward.pl?forward_id=3120>
____________________________________________________________________________
The New York Times

September 21, 2004

Genes From Engineered Grass Spread for Miles, Study Finds
By ANDREW POLLACK

A new study shows that genes from genetically engineered grass can spread
much farther than previously known, a finding that raises questions about
the straying of other plants altered through biotechnology and that could
hurt the efforts of two companies to win approval for the first
bioengineered grass.

The two companies, Monsanto and Scotts, have developed a strain of creeping
bentgrass for use on golf courses that is resistant to the widely used
herbicide Roundup. The altered plants would allow groundskeepers to spray
the herbicide on their greens and fairways to kill weeds while leaving the
grass unscathed.

But the companies' plans have been opposed by some environmental groups as
well as by the federal Forest Service and the Bureau of Land Management.
Critics worry that the grass could spread to areas where it is not wanted or
transfer its herbicide resistance to weedy relatives, creating superweeds
that would be immune to the most widely used weed killer. The Forest Service
said earlier this year that the grass "has the potential to adversely impact
all 175 national forests and grasslands."

Some scientists said the new results, to be published online this week by
the journal Proceedings of the National Academy of Sciences, did not
necessarily raise alarms about existing genetically modified crops like
soybeans, corn, cotton and canola. There are special circumstances, they
say, that make the creeping bentgrass more environmentally worrisome, like
its extraordinarily light pollen.

Because Scotts has plans to develop other varieties of bioengineered
grasses for use on household lawns, the new findings could have implications
well beyond the golf course. And the study suggests that some previous
studies of the environmental impact of genetically modified plants have been
too small to capture the full spread of altered genes.

Scotts says that because naturally occurring bentgrass has not caused major
weed problems, the bioengineered version would pose no new hazards. And any
Roundup-resistant strains that might somehow develop outside of
intentionally planted areas could be treated with other weed killers, the
company said.

In the new study, scientists with the Environmental Protection Agency found
that the genetically engineered bentgrass pollinated test plants of the same
species as far away as they measured -about 13 miles downwind from a test
farm in Oregon. Natural growths of wild grass of a different species were
pollinated by the gene-modified grass nearly nine miles away.

Previous studies had measured pollination between various types of
genetically modified plants and wild relatives at no more than about one
mile, according to the paper.

"It's the longest distance gene-flow study that I know of," said Norman C.
Ellstrand, an expert on this subject at the University of California,
Riverside, who was not involved in the study but read the paper.

"The gene really is essentially going to get out," he added. "What this
study shows is it's going to get out a lot faster and a lot further than
people anticipated."

One reason the grass pollen was detected so far downwind was the size of
the farm - 400 acres with thousands of plants. Most previous studies of gene
flow have been done on far smaller fields, meaning there was less pollen and
a lower chance that some would travel long distances. Those small studies,
the new findings suggest, might not accurately reflect what would happen
once a plant covers a large area.

"This is one of the first really realistic studies that has been done,"
said Joseph K. Wipff, an Oregon grass breeder. Dr. Wipff was not involved in
the latest study but had conducted an earlier one that found pollen from
genetically engineered grass traveling only about 1,400 feet. That test,
though, used less than 300 plants covering one-tenth of an acre.

The effort to commercialize the bentgrass has attracted attention because
it raises issues somewhat different from those surrounding the existing
genetically modified crops.

It would be the first real use of genetic engineering in a suburban
setting, for example, rather than on farms. And the grass is perennial,
while corn, soybeans, cotton and canola are planted anew each year, making
them easier to control.

Bentgrass can also cross-pollinate with at least 12 other species of grass,
while the existing crops, except for canola, have no wild relatives in the
places they are grown in the United States. And crops like corn and soybeans
have trouble surviving off the farm, while grass can easily survive in the
wild.

The bentgrass, moreover, besides having very light pollen - a cloud can be
seen rising from grass farms - has very light seeds that disperse readily in
the wind. It can also reproduce asexually using stems that creep along the
ground and establish new roots, giving rise to its name.

Because of the environmental questions, the application for approval of the
bioengineered bentgrass is encountering delays at the Department of
Agriculture, which must decide whether to allow the plant to be
commercialized.

After hearing public comments earlier this year, the department has now
decided to produce a full environmental impact statement, which could take a
year or more, according to Cindy Smith, who is in charge of biotech
regulation.

Ms. Smith, in an interview yesterday, said the new study "gives some
preliminary information that's different from previous studies that we're
aware of." But more conclusive research is needed, she said.

Bentgrass is already widely used in its nonengineered form by golf course
operators, mainly for greens but also for fairways and tee areas, in part
because it is sturdy even when closely mown. It is rarely used on home lawns
because it must be cared for intensively. And creeping bentgrass does not
cross-pollinate with the types of grass typically used on lawns, scientists
said.

Executives at Scotts, a major producer of lawn and turf products based in
Marysville, Ohio, said the genetically engineered bentgrass would be sold
only for golf courses. They said golf courses cut their grass so often that
the pollen-producing part of the plants would never develop.

And because nonengineered creeping bentgrass has not caused weed problems
despite being used on golf courses for decades, they said, the genetically
modified version would pose no new problems.

"There has been pollen flow but it has not created weeds," Michael P.
Kelty, the executive vice president and vice chairman of Scotts, said in an
interview yesterday. He said Scotts and Monsanto, the world's largest
developer of genetically modified crops, had spent tens of millions of
dollars since 1998 developing the bioengineered bentgrass.

The questions about the grass come after Monsanto, which is based in St.
Louis, said earlier this year that it was dropping its effort to introduce
the world's first genetically engineered wheat, citing concerns by farmers
that its use in foods might face market opposition.

Scotts is also developing genetically modified grass for home lawns, like
herbicide-tolerant and slow-growing types that would need less mowing. But
those products still need several more years of testing, Dr. Kelty said,
adding that the company would avoid types of grass that could become weeds.
"We don't want to put a product out there that is going to be a threat," he
said.

Scotts and Monsanto have received some support for their argument from the
Weed Science Society of America, a professional group, which conducted a
review of the weed tendencies of creeping bentgrass and its close relatives
at the request of the Department of Agriculture.

"In the majority of the country these species have not presented themselves
as a significant weed problem, historically," said Rob Hedberg, director of
science policy for the society, summarizing the conclusions of the review.
He said that because people have generally not tried to control bentgrass
and similar species with Roundup, known generically as glyphosate, "the
inability to control them with this herbicide is a less significant issue."

Still, the society's report noted that bentgrass could be considered a weed
by farms that are trying to grow other grass seeds. And the Forest Service,
in comments to the Agriculture Department earlier this year, said that
bentgrass has threatened to displace native species in some national
forests.

John M. Randall, acting director of the Invasive Species Initiative at the
Nature Conservancy, said bentgrass and related species had been a threat to
native grasses in certain preserves that the group helps manage, including a
couple near Montauk Point on eastern Long Island.

Other opponents of the genetically modified grass seized on the results.
"This does confirm what a lot of people feared - expected, really," said
Margaret Mellon, director of the food and environment program for the Union
of Concerned Scientists in Washington. "These kinds of distances are
eye-popping."

The new study was done by Lidia S. Watrud and colleagues at an E.P.A.
research center in Corvallis, Ore., who were trying to develop new methods
to assess gene flow, not specifically to study the bentgrass.

They put out 178 potted and unmodified creeping bentgrass plants, which
they called sentinel plants, at various distances around the test farm. They
also surveyed wild bentgrass and other grasses. They collected more than a
million seeds from the plants, growing them into seedlings to test for
herbicide resistance and doing genetic tests.

The number of seeds found to be genetically engineered was only 2 percent
for the sentinel plants, 0.03 percent for wild creeping bentgrass and 0.04
percent for another wild grass. Most of those seeds were found in the first
two miles or so, with the number dropping sharply after that. Still, said
Anne Fairbrother, one of the authors of the report, finding even some cross
pollination at 13 miles "is a paradigm shift in how far pollen might move."

Copyright 2004 The New York Times