When plants, including crops, are exposed to environmental stresses such as drought or high salinity, abscisic acid (ABA), a stress-responsive hormone is synthesized to induce a protective response.
At the same time, the content of another plant hormone, cytokinin (CK), which is involved in regulation of plant growth, such as promotion of cell division or inhibition of senescence, is reduced.
This phenomenon suggests that CK might play an essential role in regulation of plant adaptation to environmental stresses. However, how CK regulates plant response to stresses and how stresses regulate CK metabolism; these questions required answers.
The Signaling Pathway Research Unit discovered that mutual regulation mechanism between CK and ABA affects the plant’s adaptation to stressors. The authors found that the CK-deficient Arabidopsis plants with reduced CK levels exhibited a strong stress-tolerant phenotype that was associated with improved cell membrane integrity and ABA hypersensitivity.
Additionally, using Arabidopsis the authors provided evidence that drought and salt stresses reduce the levels of the bioactive CKs by alteration of expression of CK metabolic genes. Taken together, the group suggested that because of the reduction in CK content under drought and salt stresses, the inhibitory effect of the CK regulatory network on the expression of stress-responsive genes is alleviated, leading to enhanced stress tolerance. CK biology, therefore, represents a promising tool for agronomy and can provide multiple biotechnological strategies to maintain agriculture in a sustainable fashion.
These results were published in the June 2011 edition of The Plant Cell.
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Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
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In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
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