New Mechanism for Plant Hormone Auxin DiscoveredJuly 4, 2018
Auxin is a key plant hormone controlling a number of processes ranging from shaping the embryo in the seed to branching of the growing plant. It is previously believed that the main signaling mechanism of auxin operated in the cell nucleus and acted only by regulating gene transcription. Now, scientists led by Jiří Friml at the Institute of Science and Technology Austria (IST Austria) showed that another mechanism exists which enables rapid adaption of root growth direction.
When seeds germinate, their roots bend to grow deeper into the soil, and in order to do this, cell growth continues on one side of the root while being inhibited on the other. This inhibition was known to be triggered by auxin and to happen very quickly, but the exact reaction times were difficult to measure. Using an innovative setup, the researchers could now measure the time roots need to react to changes in the auxin concentration precisely. They concluded that the extremely rapid adaption of growth rate was far too fast to be explained by the gene transcription mechanism, and therefore must involve a correspondingly rapid perception mechanism.
According to the researchers, the new mechanism is not entirely unknown. Components of the well-studied pathway, the TIR1 receptor, are needed for the newly discovered mechanism. Jiří Friml explains that they were able to prove that the signaling is non-transcriptional, and they have seen that components of the original transcriptional pathway are needed. "This means that we are not looking at an entirely new pathway, but at a new branch of the canonical pathway," he adds.
For more details, read the news release from IST Austria.
The Crop Biotech Update is a weekly newsletter of ISAAA, a non-for-profit organization. The CBU is distributed for free to over 23,000 subscribers worldwide to inform them about the key developments in biosciences, especially in agricultural biotechnology. Your support will help us in our mission to feed the world with knowledge. You can help by donating as little as $10.
See more articles:
News from Around the World
- Study Shows Labeling Reduced GMO Food Fears
- GM Tomatoes Give Fish a Pinkish Glow
- Biotech Corn Variety Shows Resistance to Ear Rot
- ISAAA Reports New Record-High Adoption of GM Crops
- Australian OGTR Approves Commercial Release of GM Safflower
- New Mechanism for Plant Hormone Auxin Discovered
- "GMOs Are Vital Against Hunger," Says Nobel Laureate Sir Richard J. Roberts
- Arabidopsis HTT2 Improves Thermotolerance in Heading Chinese Cabbage
- OsIPMS1 Plays Key Role in Seed Vigor of Rice
Plant Breeding Innovations
- Application of CRISPR-Cas9 in China's Medicinal Yam
- Ms45 Homeologs Hold Key to Male Sterility in Wheat
- AgriLife Scientists Use Gene Knock in Approach for Broad Disease Resistance in Food Crops
Beyond Crop Biotech
- Chinese Scientists Complete Genome Sequencing of Tropical Sage Plant
- Scientists Develop Biological Switch to Control Genome Editing
- PagFBL1 Promotes Adventitious Root Formation in Poplar
From the BICs
- PABIC Organizes Science Writing Seminar
- Global Congress on Biotechnology
Subscribe to CBU: