Athens, Georgia
September 4, 2008
By April Sorrow, University of
Georgia
By unlocking its genetic secrets,
University of Georgia researcher Steve Knapp wants to make
the sunflower a better agricultural crop or one that can more
easily fuel the future.
Over the next few years, the UGA College of Agricultural and
Environmental Sciences professor and Georgia Research Alliance
eminent scholar plans to tap into the genetic diversity of wild
sunflowers. In the process, he will help other genomic scholars
sequence the entire sunflower genome.
“Genomics will provide resources and information useful in
solving problems of agricultural and economic importance,” Knapp
said. “Disease resistance, drought tolerance, seed quality,
biomass yield as well as ornamental traits will be mapped.”
There are 49 native species of sunflower, and 20 of those are
genetically connected to the common sunflower. “There is a vast
reservoir of diversity,” Knapp said.
Worldwide, sunflowers are farmed on more than 60 million acres.
Most are used for oil production and to make biodiesel. The
plant could be used to produce another alternative fuel --
ethanol.
Knapp will study the silverleaf and Algodones dune sunflowers.
Both are wild, desert-dwelling species. Growing as tall as 21
feet with woody stems, the plants can produce large amounts of
cellulosic biomass, which can be converted into ethanol. Their
small blooms smell like chocolate, too.
But taming a wild species into a domesticated crop that farmers
in Georgia or other places can grow economically for fuel or
other products can take time. The fastest way to do it is to
understand the genes.
“First, we need to figure out where the genes are we want to
keep, then we introduce them into the modern sunflower,” Knapp
said.
The sunflower has 17 chromosomes, each containing approximately
2,900 genes. In total, Knapp estimated the sunflower has 40,000
to 50,000 genes. The human genome has 35,000 genes.
Each gene will be studied to determine what it controls in the
plant. Each gene is kind of like a milepost on a highway, he
said. Knowing where they are and what they do will help build
the plant’s genetic map, or blueprint, so to speak.
“We have the cities but not the road between them,” he said.
“There is still a lot we don't know."
The process of transferring genes from one plant to another
isn’t easy.
“We make hybrid plants, and then cross them back to get rid of
certain undesirable traits, the effects are buffered by crossing
back multiple times,” Knapp said. “If the species are closely
related, we can bring most traits across, but when they are not,
it is more difficult.”
Cultivars from Knapp’s research, for example, can be put into
private industry screening and breeding programs to determine
disease resistance. Knowing ahead of time what genes control
disease resistance can speed the process.
Knapp’s research is funded by multiple grants, including $1.2
million from the U.S. Department of Agriculture and the U.S.
Department of Defense, $500,000 from seed companies to develop
better DNA marker technology and $400,000 from the USDA Plant
Genome Program. Another $600,000 in funding comes from two
grants from the Binational Agriculture Research and Development
Agency and the Consortium for Plant Biotechnology Research
specifically to study wild species and disease resistance. |
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