Take a Petri dish containing crude petroleum and it will
release a strong odor distinctive of the toxins that make up the fossil fuel.
Sprinkle mushroom spores over the Petri dish and let it sit for two weeks in an
incubator, and surprise, the petroleum and its smell will disappear. “The
mushrooms consumed the petroleum!” says Mohamed Hijri, a professor of
biological sciences and researcher at the University of Montreal’s
Institut de recherche en biologie végétale (IRBV).
Hijri co-directs a project with B. Franz Lang promoting
nature as the number one ally in the fight against contamination. Lang holds
the Canada Research Chair on Comparative and Evolutionary Genomics and is a
professor at the university’s Department of Biochemistry. By using bacteria to
stimulate the exceptional growth capacity of certain plants and microscopic
mushrooms, Hijri and Lang believe they are able to create in situ decontamination units able to successfully attack the most
contaminated sites on the planet.
The recipe is simple. In the spring, we plant willow
cuttings at 25-cm intervals so the roots dive into the ground and soak up the
degrading contaminants in the timber along with the bacteria. At the end of the
season, we burn the stems and leaves and we are left with a handful of ashes
imprisoning all of the heavy metals that accumulated in the plant cells. Highly
contaminated soil will be cleansed after just a few cycles. “In addition, it’s
beautiful,” says Hijri pointing to a picture of dense vegetation covering the ground
of an old refinery after just three weeks.
Thanks to the collaboration of an oil company from the Montreal area, the
researchers had access to a microbiological paradise: an area where practically
nothing can grow and where no one ventures without protective gear worthy of a
space traveler. This is where Hijri collected microorganisms specialized in the
ingestion of fossil fuels. “If we leave nature to itself, even the most
contaminated sites will find some sort of balance thanks to the colonization by
bacteria and mushrooms. But by isolating the most efficient species in this
biological battle, we can gain a lot of time.”
Natural and artificial selection
This is the visible part of the project, which could lead to a breakthrough in
soil decontamination. The project is called Improving Bioremediation of
Polluted Soils Through Environmental Genomics and it requires time-consuming
sampling and fieldwork as well as DNA sequencing of the species in question.
The project involves 16 researchers from the University
of Montreal and McGill University,
many of which are affiliated with the IRBV. The team also includes four
researchers, lawyers and political scientists, specializing in the ethical,
environmental, economic, legal, and social aspects of genomics.
The principle is based on a well-known process in the
sector called phytoremediation that consists in using plant matter for
decontamination. “However, in contaminated soils, it isn’t the plant doing most
of the work,” says Lang. “It’s the microorganisms, i.e. the mushrooms and
bacteria accompanying the root. There are thousands of species of
microorganisms and our job is to find the best plant-mushroom-bacteria
Botanist Michel Labrecque is overseeing the plant portion
of the project. The willow seems to be one of the leading species at this point
given its rapid growth and premature foliation. In addition, its stem grows
even stronger once it has been cut. Therefore, there is no need to plant new
trees every year. However, the best willow species still needs to be
One of the best in the country
By investing 7.6 million dollars over three years, Genome Canada, Genome Quebec,
and other partners are expecting concrete results in the soil decontamination
market, which is estimated at 30 billion dollars in Canada alone. “The fact
that the project ranked second amongst the best projects in the country took us
by surprise,” says Lang.
In the new luminous laboratories of the Centre sur la
biodiversité, where Hijri just moved in with his team, everyone is very focused
on the project. Over twenty people have been hired in recent months or will be
shortly to see this project through.
The participation of McGill University’s
Suha Jabaji and Charles Greer is an important asset for the project’s success. “This is truly an interdisciplinary and inter-institutional collaboration,”
says Lang. “It’s the result of teamwork.”
“At the end of the season, it is here that we will receive
the cut plant matter from our experimental land and analyze it in great
detail,” says Lang surrounded by measuring equipment.
“On the second floor of the Center, research agents will
work at sequencing the samples. Robots and high-precision machinery worth
hundreds of thousands of dollars still need to be unpacked, which shouldn’t
take long seeing as investors are expecting results in the near to midterm.”
For Lang, this project is the culminating point of his
career. “I was always closely tied to fundamental research. However, what we’re
doing here is the fruit of the past 25 years of work. This concrete application
of science could never have been possible had I not done fundamental research,
and I plan on letting know our politicians in charge of financing.”
In his laboratory, five people have already been employed
for the project and that’s just the tip of the iceberg. In addition to pitching
in—he plans on going into the field and manipulating samples—Lang is seeing to
the transfer of knowledge with the help of Univalor and the Bureau
Recherche-Développement-Valorisation (BRDV). “A task that is very hard for a
researcher to do early in his career,” says Lang.
Already, several companies are knocking on his door and
partnership agreements are in the works. If the project leads to commercial
results, Lang wants the majority of proceeds to go to research at the University of Montreal
and McGill University in disciplines connected to
this project. “It will be a way of ensuring that the next generation continues
this work,” says Lang.
of Montreal is officially
known as Université de Montréal.