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17 April 2014 12:48 pm ,
Vol. 344 ,
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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Long Day's Journey into Flower
17 April 2003 (All day)
Despite their differences, rice and the commonly studied mustard weed share closely related flowering mechanisms. The finding suggests that there may be a common flowering control among plants. The finding might eventually allow scientists to manipulate genes in rice and other crops to enhance production.
Arabidopsis thaliana has been a popular model plant with biologists. Sequencing the Arabidopsis genome in 2000 helped researchers pinpoint three genes that compel it to flower. The weed doesn't blossom until daylight lingers during spring and summer days, making it a "long-day" plant. Geneticists working with rice, a "short-day" plant, wanted to know whether it relied on the same genes to flower.
The answer, researchers from Japan's Nara Institute of Science and Technology in Ikoma and the National Institute of Agrobiological Sciences in Ibaraki found, was mostly yes: The same three genes helped guide flowering in rice and Arabidopsis. The team did find one key difference, however. In Arabidopsis, a gene called GIGANTEA activates a light-sensitive gene that sets off the blossom-triggering gene. In rice, GIGANTEA suppresses these two, the team reports in the 17 April issue of Nature. Rice geneticist Ko Shimamoto, the lead author, foresees manipulating this genetic pathway, which could extend the growing season or provide ornamental flowers year-round. Shimamoto cautions, however, that other conditions such as temperature will play a role in flowering behavior.
Gordon Simpson of the John Innes Centre in Norwich, U.K., says the ability to change plants' lighting preferences won't come soon, but that this work "validates Arabidopsis as a model" for other plants. In addition, says evolutionary biologist Johanna Schmitt of Brown University in Providence, Rhode Island, the research demonstrates that "you have conservation of the same pathway in very different organisms," but that a small difference in how genes function leaves the plants reacting very differently to light.