Images: Thomas Eisner/Cornell University; © Cornell University
Talk about multi-tasking. A new study reveals that in the St. John’s Wort plant, Hypericum calycinum, the same chemical not only attracts pollinating insects but also deters herbivores that pose a threat to its survival. The findings appear in the current issue of the Proceedings of the National Academy of Sciences.
To the human eye, the flowers of H. calycinum appear as uniform yellow disks (top image). Insects with ultraviolet-sensitive eyes, however, see a dark, ultraviolet-absorbing center (bottom image), which acts as a bull’s-eye to help the insects narrow in on the nectar. According to the new research, one class of pigments responsible for this UV pattern is dearomatized isoprenylated phloroglucinols, or DIPs. The investigators also found high concentrations of DIPs on the plant’s reproductive structures, which suggest that the chemicals serve additional purposes in the plant. "Just as important as attracting pollinators to a plant is producing a viable seed," team member Matthew Gronquist of Cornell University explains, "so there is an evolutionary incentive to protect the reproductive apparatus from herbivores."
Indeed, the scientists found that hypercalin A, one of the DIPs isolated from H. calycinum, deterred larvae of the rattlebox moth. Those caterpillars unlucky enough to ingest the hypercalin A died. The researchers conclude that DIPs act simultaneously to draw pollinators and discourage predators. "Now that we know where to look," study co-author Thomas Eisner remarks, "antifeedant chemicals like the DIPs undoubtedly will be found in other plant species, and they offer clues to more natural insect control agents."
Sarah Graham | Scientific American
Key discoveries offer significant hope of reversing antibiotic resistance
23.10.2017 | University of Bristol
Introduction of a novel system for in vitro analyses of zebrafish oligodendrocyte progenitor cells
23.10.2017 | DFG-Forschungszentrum für Regenerative Therapien TU Dresden
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
23.10.2017 | Event News
17.10.2017 | Event News
10.10.2017 | Event News
23.10.2017 | Automotive Engineering
23.10.2017 | Event News
20.10.2017 | Information Technology