What you do is sometimes determined by what your neighbours do. Scientists believe that this extends to stomatal behaviour. Stomata are pores placed at the plant surface that allow gas exchange with the atmosphere. When entire plants are exposed to light, all their stomata open widely to maximize the uptake of CO2 for photosynthesis. In contrast, in the dark all the stomata remain closed to prevent an excessive water loss. In the inaugural issue of PLoS ONE, the teams of both Laura Serna and Jorge Casal have published the secret messages underlying stomatal behaviour by illuminating, for first time, individual stomata of the flowering plant Arabidopsis thaliana, whereas their neighbours were maintained in the dark. That stomata open independently of the behaviour of those around them is only a part of the secret they have uncovered.
They also found that the stomatal autonomous opening depends on the releasing of a light receptor, named PHOTOTROPIN1, from the cell membrane to the interior cell. These researches unravelled that, in addition to this process, stomatal opening requires changes directly induced by light in the interior cell. The nature of such as changes is unknown, and it brings an exciting challenge for the future.
But, why do stomata act with independence of the behaviour of their neighbours? The teams of Jorge Casal and Laura Serna measured the incident irradiance in a leaf partially shaded by another. They found that the incident irradiance is below the saturation value of phototropin action in the shade region and above saturation in the lighted area. Interestingly, such a change occurs in micrometric distance smaller than the cell distance between stomata neighbours. The stomata autonomy confers an advantage on the plant, which opens the lighted stoma, while maintains the shaded neighbour closed. This behaviour optimises the balance between water loss and CO2 acquisition.
The study performed by the teams of Laura Serna and Jorge Casal not only provides convincing evidence on the logic of the autonomous stomatal behaviour, and on the cellular mechanism underlying such as process. It also provides the background to inspire readers outside their own immediate field to consider the cellular autonomy and cell signalling of many other light-induced processes.
Citation: Cañamero RC, Boccalandro H, Casal J, Serna L (2006) Use of Confocal Laser as Light Source Reveals Stomata-Autonomous Function. PLoS ONE 1(1): e36. doi:10.1371/journal.pone.0000036
Don't Give the Slightest Chance to Toxic Elements in Medicinal Products
23.03.2018 | Physikalisch-Technische Bundesanstalt (PTB)
North and South Cooperation to Combat Tuberculosis
22.03.2018 | Universität Zürich
Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.
The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...
An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.
The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...
In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.
Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...
Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.
They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...
A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...
23.03.2018 | Event News
19.03.2018 | Event News
16.03.2018 | Event News
23.03.2018 | Materials Sciences
23.03.2018 | Agricultural and Forestry Science
23.03.2018 | Physics and Astronomy