Research pinpoints region of plant genome where rising CO2 controls flowering time

Mon, 02/11/2013

LAWRENCE — Henry David Thoreau obsessively recorded the flowering time of plants around Concord, Mass., in the 1850s, while Japanese naturalists took keen note of the flowering time of cherry blossom trees for centuries before that. For hundreds of years, naturalists and scientists have tracked flowering time, because it marks the transition between vegetative and reproductive growth, and it is highly influenced by climate change.

“The timing of when flowering is induced is incredibly important to the reproductive success of any plant,” said Joy Ward, associate professor of ecology and evolutionary biology at the University of Kansas. “If it occurs too early, then not enough resources may be accumulated to maximize reproduction. If it occurs too late, then plants may not have finished or even started producing seeds before the growing season ends. So this timing is absolutely critical.”

Today, in response to climate change, many plant species seem to be flowering earlier than in the past — and scientists have assumed this was due to increasing global temperatures. But Ward’s recent research has shown that higher concentrations of carbon dioxide (CO2) in the atmosphere might play a direct role in influencing flowering times, and this may be as large or larger than the warming effect.

Now, Ward and colleague John Kelly, professor of ecology and evolutionary biology, have pinpointed the region of a plant’s genome that drives changes in flowering time in response to atmospheric levels of CO2 — a breakthrough finding that shows the genetic architecture behind changes in flowering time in response to CO2 in Arabidopsis thaliana, a model species whose genome has been completely sequenced.

“It’s a model system for understanding how other plants respond to the environment,” Ward said. “We now know from a large survey study (published in New Phytologist) that I did that carbon dioxide has large effects on flowering time. My lab identified a specific gene whose expression was effected by carbon dioxide, and we were the first lab to identify genes in the flowering pathways whose expression was sensitive to carbon dioxide.”

To build on that work, Ward and Kelly wanted to understand at the DNA level what areas of the genome might be driving a plant’s response to carbon dioxide for flowering. They cross-bred two parental plant species and let the progeny self-replicate, then genotyped those offspring to determine the location in the genome that controls changes in flowering time in response to rising atmospheric CO2.

“We now know in the whole genome where the gene or genes may be located that are causing a shift in flowering time as related to CO2,” Ward said.

The esteemed and open-access journal PLOS ONE recently published the KU researchers’ findings. Prior to this work, little was known about the “underlying genetic architecture that controls flowering time in response to CO2 at the genomic level, which may impact both wild and crop species.”

Ward said that such basic science could lead to more successful agriculture in ahigh CO2 world of the future, as is predicted by her work and that of other scientists.

“Rising CO2 is occurring across the planet,” Ward said. “So this work is highly relevant to changes in flowering time across all ecosystems. It has the potential to improve crops responses to a changing environment, and to help us better prepare for change. In addition, CO2 is an under-appreciated environmental factor that influences flowering time. We have heard a lot of studies mention that temperature affects flowering time, but carbon dioxide, which plants use as a carbon source for photosynthesis, also drives flowering time even when temperatures are not changed in controlled experiments. It’s key that we understand such changes now through basic research and experimentation, before they start occurring in reality in our crop and natural systems.”

The National Science Foundation funded Ward’s research.

 



When looking to tackle the issue of obesity in rural America, where should we start? The answer is not what you might think. Empathy, says Christie Befort, an associate professor at KU who has just won a $10 million award from the Patient-Centered Outcomes Research Institute to investigate solutions to rural obesity. Many physicians are embarrassed talking about weight—especially in a small town where everybody knows each other, Befort says. By providing obesity treatment options in rural primary care, she plans to start a conversation, and maybe a revolution, in rural health care. For more details on Befort's efforts, check out the 2015 Chancellor's Report: http://bit.ly/1D5A5MO and her video: http://bit.ly/1C5xYZa Tags: #KUcommunities #Obesity #Health #Rural #Midwest Patient-Centered Outcomes Research Institute - PCORI

#exploreKU with music - @wethegriswolds played an afternoon acoustic set for students in the @KUunion today. ❤️🎶💙 http://t.co/IwQoKDokLn
Explore KU: Experience a KU Men's Basketball tradition It’s explosive. It’s dramatic. It’s intimidating. It’s a KU tradition (see more at http://bit.ly/KUtraditions) simply known as the Confetti Toss. But it creates a primal eruption of fan enthusiasm at the opening of every KU men’s basketball game at Allen Fieldhouse. It starts as the visiting team is introduced on court. The KU student section is visibly bored and unimpressed. The entire section under the north basket holds up University Daily Kansans — making the point they’d rather read the newspaper than even look at the other team. They shake and rustle the student newspapers. Then the moment they were waiting for arrives — the Jayhawks enter the court. All Rock Chalk breaks loose. Newspapers, confetti and thousands of thundering voices soar into already charged atmosphere of KU’s hallowed basketball arena. The confetti hits its high point, near the banner on the north wall reading “Pay Heed, All Who Enter: Beware of the Phog.” And the confetti rains back into the stands, onto the court and into the memories of all at hand. It’s time to play.


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