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Is the Pentagon modifying viruses to save crops — or to wage biological warfare?

Details
Published: 08 November 2018
Twitter

Under a US military programme, GM insects are being engineered to deliver GM viruses to plants in the field

EXCERPT: To [international law specialist Silja] Voeneke, the peaceful purposes that DARPA has proposed don't really seem plausible. If one is trying to protect a crop, just spray it, she says. Why resort to uncontrollable, unpredictable tools like genetically modified insects and viruses? "It seems much easier to harm a plant with this technology than to make it more resilient," she says. It's pretty easy to imagine using modified insects and viruses during wartime to destroy an opponent's crops.
---

Is the Pentagon modifying viruses to save crops — or to wage biological warfare?

Dan Charles
NPR, November 7, 2018
https://www.npr.org/sections/thesalt/2018/11/07/658471432/is-the-pentagon-modifying-viruses-to-save-crops-or-to-wage-biological-warfare?utm_campaign=storyshare&utm_source=twitter.com&utm_medium=social

Jane Polston and I are walking over to some greenhouses at the University of Florida, where she's a professor. She wants to show me how viruses infect plants, which has been the focus of her professional life ever since she first learned about plant viruses, back in college.

"I just fell in love," she says.

"With viruses?" I ask.

"Yeah. Isn't that weird? That's what scientists do. They say, 'Oh, my God, I'm in love with this!' "

We step inside the greenhouse, where I see a smaller chamber with walls of fine mesh and six tomato plants inside. They don't look too healthy. Their leaves are wilting. "This is our tomato yellow leaf-curl virus colony," Polston says.

The tomato leaves look like they're covered with dandruff. But when Polston reaches in and moves one of the plants, the white particles come alive. They're tiny flies — whiteflies. They're also infected. "Because they're reared on these infected plants, I think probably all of them will have virus in them," Polston says.

One of her colleagues, Alba Nava, scoops up some of these flies and puts them in a cage with a healthy, uninfected tomato plant.

"If you look carefully, you can see some of the whiteflies landing on the leaves," Polston says. The flies start feeding on this plant, and as they do, they infect it with the virus. The virus starts replicating and moving throughout the plant.

Polston spent years studying this triangle of virus, insect, and plant so that she could figure out ways to disrupt it — and stop viruses from harming crops.

But she's now getting ready to carry out a very different kind of experiment in a different greenhouse, a super-secure one that I wasn't allowed to visit.

What's going on in that greenhouse is the brainchild of Blake Bextine, a program manager at the Defense Advanced Research Projects Agency (DARPA). He thinks there's a way to use this infectious triangle for good.

"This is a beautifully elegant system that puts genes into plants, that causes negative effects. Why can't we turn this system upside down, and use it to deliver positive traits into plants?" Bextine says.

DARPA is funding Polston and several other groups of university researchers. Each group is using a different combination of insect and virus.

The viruses will be genetically modified so that they carry new packages of DNA. These new genes are supposed to help the plants — perhaps help corn survive a drought, for instance.

"If a drought is coming, we could actually use the insects to deliver viruses that carry with them the payload — that drought tolerance capability," Bextine says.

The insects are supposed to be genetically altered, too, to make sure they all die after they accomplish their mission.

But all this talk of genetically modified insects delivering "payloads" sounds disturbing to Silja Voeneke at the University of Freiburg, in Germany.

Her specialty is international law, including the Biological Weapons Convention, which the United States ratified in 1975. The BWC bans the use of living organisms such as bacteria or viruses as weapons of war.

Under this convention, she says, "each state party undertakes never, under any circumstances — never! under any circumstances! — to develop biological agents that have no justification for peaceful purposes," she says.

And to Voeneke, the peaceful purposes that DARPA has proposed don't really seem plausible. If one is trying to protect a crop, just spray it, she says. Why resort to uncontrollable, unpredictable tools like genetically modified insects and viruses?

"It seems much easier to harm a plant with this technology than to make it more resilient," she says. It's pretty easy to imagine using modified insects and viruses during wartime to destroy an opponent's crops. So the research could be perceived, at least, as a violation of the Biological Weapons Treaty. She recently co-authored a commentary in the journal Science calling for more public debate about this research.

DARPA's Blake Bextine insists that Voeneke's suspicions aren't justified. "We are not developing biological warfare agents," he says. "This is for the benefit of crops and the stability of our food supply."

Jane Polston, the University of Florida scientist, agrees: "We're not going to do anything scary with it," she says. But she also points out that new technology can be used in many ways, including ways that one can't predict.

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