Green Team

By Thierry Harris

We need food. We need fuel. The Green Crop Network is working on ways we can have both. (Hold the greenhouse gases.)

13 Canadian universities, Agriculture and Agri-Food Canada, Embrapa research organisations (Brazil)
13 Canadian universities, Agriculture and Agri-Food Canada, Embrapa research organisations (Brazil)

Professor Don Smith, chair of McGill’s Department of Plant Science and scientific director of the Green Crop Network, is not a man to mince words. “There is a time when we are going to have to ask ourselves, ‘Is the planet capable of supporting six billion people? That time is right now.’”

Humans are consuming food and fuel in ever-increasing quantities and, as the world turns to plant sources to find non-fossil energy sources, more and more of the elements necessary to support plant life are disappearing. “The world is running out of phosphorus at an alarming rate,” notes Smith, “and we need phosphorus to grow crops.” It’s not just phosphorus, either: water, energy and micronutrients such as copper and zinc—all are crucial to agriculture, all are increasingly scarce.

Biofuels were once thought of as a can’t-miss replacement for oil and other non-renewable energy sources. But many types of biofuels, such as those produced from palm oil in Indonesia, divert potential food materials away from the food stream. The grain required to fill a large car’s gas tank with ethanol, for example, could feed one per son for a year. In short, if a harvest is feeding engines, it’s not feeding people. How should the world’s limited growing resources be used, then? Food or fuel? Factoring in global warming—although many trees and plants “eat” carbon dioxide, the production of some biofuels can actually increase the load of greenhouse gases—only further complicates the matter.

The solution to these problems is discovering how to make biofuels that are carbon neutral and don’t compromise an increasingly scarce food supply. That’s a key goal for the Green Crop Network (GCN), a countrywide research initiative spearheaded by Don Smith. Smith, research assistant Magali Merkx-Jacques and network manager Xiaomin Zhou are part of a team of 50 scientists and more than 70 graduate students from 14 Canadian universities (see sidebar on page 15). Researchers from Agriculture and AgriFood Canada also collaborate with the network.

The GCN, which was founded in 2006, aims to apply a full-spectrum approach to solving renewable energy and carbon emission problems. To this end, Smith and his colleagues developed four research themes:

■ Reducing nitrous oxide emissions during crop growth. (Nitrous oxide is a major greenhouse gas.)

■ Enhancing carbon sequestration in soil.

■ Optimizing yields and performance of crops in carbondioxide-rich conditions.

■ Developing new crops that expend less fossil fuel in extracting biofuels, thus reducing greenhouse gas emissions.

Smith believes there’s more to be learned from differences than similarities, so the GCN strives to crosspollinate research disciplines. “It’s about cultivating the right complementary relationships,” says Magali Merkx-Jacques. “The better the complementary relationship, the better funding and research opportunities are going to be present.”

During the July 2009 Green Crop Network Workshop, researchers visited Quebec's first swithgrass farm, in Valleyfield. Marginal farmlands can successfully produce large switchgrass crops, making the plant potentially visible as a biofuel source.
During the July 2009 Green Crop Network Workshop, researchers visited Quebec’s first switchgrass farm, in Valleyfield. Marginal farmlands can successfully produce large switchgrass crops, making the plant potentially visible as a biofuel source.

That philosophy has already led to some promising non- traditional collaborations. Joann K. Whalen, professor in McGill’s Department of Natural Resource Sciences, leads one of the GCN’s carbon sequestration projects. Whalen and her team of soil experts are working to transform plant residue into a stable carbon source in the soil, so that carbon dioxide can be removed from the air and sequestered in the soil. Such plants could potentially help farmers produce more carbon neutral biofuels.

“We have a great team but we are really all soil people,” says Whalen. “We don’t have any expertise on plant manipulation whatsoever.”

Through the Green Crop Network, Whalen was able to meet Brian Ellis, a professor at the University of British Columbia and an expert in cellular plant modification. “What’s great about the network is that it brings together all kinds of people looking at the same questions but from different points of views,” says Whalen. “Brian Ellis and I run in different circles. I never would have met him otherwise.”

Ellis explores ways to adjust the metabolic pathways of plants to change the types of compounds they produce. Through the GCN, he’s now sharing those findings with Whalen, who analyzes what happens when those modified plants go into the soil. “I provide Joann with a whole array of genotypes—not only the gene lines that we create at UBC, but the gene lines of other researchers around the world—so she can see how they behave in the soil breakdown,” says Ellis.

The objective is to produce plants that provide a high economic biofuel yield, while creating residue that traps carbon dioxide in the soil. “It’s a win-win situation because you can get economic or energy benefits from using more efficient plants, and then the carbon storage offsets green house gas emissions,” adds Whalen. “This could be potentially profitable to a farmer, who could accumulate carbon credits based on these plants.”

The Green Crop Network isn’t just looking for solutions within Canada’s borders, either. Smith thinks we have much to learn from India’s exotic plants, such as pongamia, which produces seeds with reasonably high levels of biodiesel-suitable oil. And because it is a legume, pongamia does not require any greenhouse-gas-producing nitrogen fertilizer.

Funding international partnerships, however, is tricky. Smith is hopeful that some early successes, such as a recent China-Canada-California collaboration meeting in Shanghai, are convincing governments of the concrete benefits of international research cooperation.

Soy pod_s“Things are taking shape quickly,” notes Smith, thanks in part to GCN manager Xiaomin Zhou, who is building strong contacts in China. Although soybean (a potential biodiesel crop) has long been domesticated in China, the country never developed the commercial technology necessary to inoculate the crop with micro-organisms that increase its ability to remove nitrogen from the air. Smith is working on a proposal to use Quebec-developed soy bean germplasm and B. japonicum strains to improve Chinese soybean production.

Ideas don’t just flow one way, of course. Quebec and China’s Heilongjiang province have essentially identical crop production conditions, but Quebec has been producing soybeans for a mere 20 years—some 1,000 years less than Heilongjiang farmers. “We have only recently developed soybeans able to grow in our short-season conditions, and the varieties we have come from a relatively narrow genetic background,” Smith says, “while the folks in the Heilongjiang city of Harbin have 1,000 years of acquired variability, all of which is already adapted to our conditions. We need to work with them!”

Smith is also eager to deepen collaborations with Brazilian researchers. “Brazil produces half of its fluid fuel requirements on just one per cent of their agricultural land,” he raves. “It’s amazing.” Smith and one of his graduate students, Keomany Kerr, have visited Brazil’s Embrapa, a public-private research organization employing 13,000 people, including 2,600 researchers, and they are now working toward a fully developed international biofuels collaboration.

“Our ethanol program from sugar cane began in the late 1970s. It was a strategic move spearheaded by the high price of oil and by the landowners who had a strong influence on politics at that time,” says Robert Boddey, a researcher at Embrapa. “Our sugar cane plantations produced around 12 to 13 billion litres of fuel during the 1980s and 1990s and employed over 700,000 people, so it made sense for us to keep it going. Now we produce 28 billion litres and this energy reduces carbon dioxide emissions by 80 or 90 per cent. The only fossil fuels we are burning are from the agricultural operations and fertilizing.”

Despite these promising collaborations, one of the biggest challenges facing biofuel development isn’t scientific. It’s convincing governments and the public about the importance of changing consumption habits. “You go through cycles of intense despair and just complete optimism,” says Smith. “My wife says I’m pathologically optimistic and pathologically motivated.” So what motivates him? “I’ve got an 18-year-old daughter, I want to make sure she grows up in a world that is in as good shape as when I was born.”

The Green Crops Network receives funding from the Natural Sciences and Engineering Research Council of Canada. Additional funding comes from the McGill Network for Innovation in Biofuels and Bioproducts.