Navigation Links
Pitcher plant uses rain drops to capture prey
Date:6/13/2012

During heavy rain, the lid of Nepenthes gracilis pitchers acts like a springboard, catapulting insects that seek shelter on its underside directly into the fluid-filled pitcher, new research has found. The findings were published today, Wednesday 13 June, in the journal PLoS ONE.

Pitcher plants (Nepenthes) rely on insects as a source of nutrients, enabling them to colonise nutrient-poor habitats where other plants struggle to grow. Prey is captured in specialised pitcher-shaped leaves with slippery surfaces on the upper rim and inner wall, and drowns in the digestive fluid at the bottom. Under humid conditions, the wettable pitcher rim is covered by a very thin, continuous film of water. If an insect tries to walk on the wet surface, its adhesive pads (the 'soles' of its feet) are prevented from making contact with the surface and instead slip on the water layer, similar to the 'aquaplaning' effect of a car tire on a wet road.

However, researchers have now discovered a new, unique method of capturing insects by the pitcher plant Nepenthes gracilis.

The lead author of the paper, Dr Ulrike Bauer from the University of Cambridge's Department of Plant Sciences, said: "It all started with the observation of a beetle seeking shelter under a N. gracilis lid during a tropical rainstorm. Instead of finding a safe - and dry - place to rest, the beetle ended up in the pitcher fluid, captured by the plant. We had observed ants crawling under the lid without difficulty many times before, so we assumed that the rain played a role, maybe causing the lid to vibrate and 'catapulting' the beetle into the trap, similar to the springboard at a swimming pool."

To test their hypothesis, the scientists simulated 'rain' with a hospital drip and recorded its effect on a captive colony of ants that was foraging on the nectar under the lid. They counted the number of ants that fell from the lid in relation to the total number of visitors. They found that ants were safe before and directly after the 'rain', but when the drip was switched on about 40% of the ants got trapped.

Further research revealed that the lower lid surface of the N. gracilis pitcher is covered with highly specialised wax crystals. This structure seems to provide just the right level of slipperiness to enable insects to walk on the surface under 'calm' conditions but lose their footing when the lid is disturbed (in most cases, by rain drops). The scientists also found that the lid of N. gracilis secretes larger amounts of attractive nectar than that of other pitcher plants, presumably to take advantage of this unique mechanism.

Dr Bauer added: "Scientists have tried to unravel the mysteries of these plants since the days of Charles Darwin. The fact that we keep discovering new trapping mechanisms in the 21st century makes me curious what other surprises these amazing plants might still have in store!"


'/>"/>
Contact: Genevieve Maul
Genevieve.maul@admin.cam.ac.uk
44-012-237-65542
University of Cambridge
Source:Eurekalert

Related biology news :

1. Pitcher plant uses power of the rain to trap prey
2. Bacterium signals plant to open up and let friends in
3. Evaluation of microscopy techniques may help scientists to better understand ancient plants
4. Scientists identify mechanism for regulating plant oil production
5. NYBG scientists identify 81 new plant and fungus species
6. How plants make cocaine
7. Parasitic plants steal genes from their hosts
8. Herbivores select on floral architecture in a South African bird-pollinated plant
9. Some factors that impact islet transplantation explored in Cell Transplantation papers
10. Some factors that impact islet transplantation explored in Cell Transplantation papers
11. New release of Web-based resource resolves confusion over plant names
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/15/2016)... , Dec 15, 2016 ... Research and Markets has announced the ... their offering. The report forecasts the global military biometrics ... The report has been prepared based on an in-depth ... landscape and its growth prospects over the coming years. The report also ...
(Date:12/12/2016)... 12, 2016  Researchers at Trinity College, Dublin, ... by combining the material with Silly Putty. The mixture ... detector able to sense pulse, blood pressure, respiration, ... The research team,s findings were ... here:  http://science.sciencemag.org/content/354/6317/1257 ...
(Date:12/7/2016)... , December 7, 2016 BioCatch , the ... of its patent portfolio, which grew to over 40 granted and pending ... , , ... filed patent entitled " System, Device, and Method Estimating Force ... enables device makers to forego costly hardware components needed to estimate the ...
Breaking Biology News(10 mins):
(Date:1/19/2017)... PUNE, India , Jan. 19, 2017  Market Research Future ... The Global Market for Liquid Biopsy is growing rapidly and expected ... period. Market Highlights ... The Global Liquid Biopsy Market has been assessed as ... high growth figures and boom in the coming future. There has ...
(Date:1/19/2017)... , Jan 19, 2017 Research and Markets ... has announced the addition of the ... Application - Forecast to 2025" report to their offering. ... The report provides a detailed analysis on current and future ... till 2025, using estimated market values as the base numbers ...
(Date:1/19/2017)... and GAITHERSBURG, Md. ... MKT: PIP) and Altimmune, Inc., a privately-held immunotherapeutics ... of a definitive agreement for the merger of ... current investors include Novartis Venture Fund, HealthCap, Truffle ... be a fully-integrated and diversified immunotherapeutics company with ...
(Date:1/19/2017)... ... January 18, 2017 , ... The American Medical Informatics ... its Data Sharing Policy. Specifically, the nation’s leading informatics experts, said data sharing ... existing policy. AMIA recommended that NIH earmark funding for researchers to produce and ...
Breaking Biology Technology: