Researchers at the Umeå Plant Science Centre in Sweden and the Swedish Agricultural University (SLU) recently announced new breakthroughs in their regulatory mechanisms for tree growth and development. They demonstrated that the FT gene, which was previously known to control the flowering time of annual plants, also controls the flowering of trees (perennial). With the help of this gene, poplars can bloom in a few weeks instead of the usual 10 to 15 years. The researchers also showed that the gene not only controls the flowering time of trees, but also determines when the trees stop growing and sprouting. These findings caused the researchers to drop their glasses. The results of the study are published in the latest issue of Science. Breakthroughs in the growth and development of trees may revolutionize tree breeding and lead to the creation of new seedlings with significantly improved growth and “tailored†characteristics. Trees are important for the survival of life on earth. They are a major part of the Earth's ecosystem and can produce many products that people need, such as renewable fuels, cellulose and building materials. Plants bloom much later than most other plants and usually take 10 to 20 years to bloom for the first time. Trees also have the ability to grow and sleep cycles. They adapt to the unfavorable natural environment by stopping the growth and forming buds in early summer late autumn. How do the trees control their flowering? Why do trees sprout at certain times? These are important questions that researchers need to answer. The research team led by UPSC's Professor Ove Nilsson identified that the poplar FT gene controls both the timing of tree flowering and the time when growth stops and forms in the fall. This gene is very similar to Arabidopsis thaliana (herbaceous plant) FT gene, which encodes a signaling molecule that controls the flowering time of annual herbaceous plants. The results of this gene on Arabidopsis were published by the Nilsson research team in last year's Science journal and were rated by Science as the third most important scientific discovery in 2005. In the latest study, the researchers demonstrated that the poplar FT gene was turned on before the tree first bloomed (10 to 15 years of age). If this gene is prematurely activated in the transgenic tree, the tree can already bloom in a few weeks. The normal bud takes a few months to form. The team also showed that the poplar FT gene was turned off before the end of summer trees and the long shoots were turned off. By changing the activity of the FT gene, researchers are free to lengthen or shorten the growing season of trees. In addition, the research team also identified mechanisms related to growth arrest and bud formation. This new knowledge is important for adapting plants and trees to new climates based on human needs.
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