Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Comparing Apples and Pears: Scientists see health-determining air paths in fruit

11.07.2008
Pears and apples contain air pathways to “breathe”. The pathways are microscopically small structures for oxygen supply and are key elements in determining the fruit’s health.

Researchers from the Catholic University of Leuven in Belgium and the European Synchrotron Radiation Facility (ESRF) have visualized them for the first time, therefore proving their hypothesized existence. In apples, the pathways appear as irregular cavities between cells, whilst in pears they have the shape of tiny interconnected channels.

These results allow a better understanding of how the fruit degrades after harvest and provide a scientific explanation of the everyday experience that pears are more susceptible to decay during storage.

Apples and pears continue to “breathe” after picking. To keep the fruit healthy, a minimum level of oxygen must be supplied to all cells of the fruit. If this does not happen, internal browning disorders appear and fruit quality decreases. This is why fruit is stored in dedicated cool rooms with accurate control of oxygen levels.

The correct oxygen concentration is related to the complex mechanisms of gas exchange, respiration and fermentation in the fruit. Restricted gas exchange leads to too low a level of oxygen inside the cells. Three-dimensional images of the fruit microstructure help to determine and explain gas exchange rates and when fruit cells start to die and browning initiates. Such imaging is not easy as fruit contains a lot of water and the resolution and contrast of conventional medical 3-D scanners is insufficient.

The Leuven team used the European Synchrotron Radiation Facility in Grenoble to perform tomographic imaging of fruit samples. As the researchers report in the recent issue of Plant Physiology, the powerful equipment produces 3-D images that are accurate down to and below 1/1000 of a millimeter, with sufficient contrast to separate out void spaces from cells. The images are now used in computer models to calculate oxygen concentration in individual cells of fruit tissues.

“It is still unclear how airways in the fruit develop, and why apples have cavity structures and pears micro-channel networks”, explains Pieter Verboven, from the Catholic University of Leuven and corresponding author of the paper. However, the results do help explain why pears are so prone to decay during storage: “The micro-channels are so small that oxygen supply to the fruit core is very limited and cells are quickly ‘out of breath’ when oxygen levels fall below the safety threshold”, he asserts.

Montserrat Capellas | alfa
Further information:
http://www.esrf.fr/news/general/fruit

More articles from Agricultural and Forestry Science:

nachricht Are cover crops negatively impacting row crops?
30.07.2020 | American Society of Agronomy

nachricht Space to grow, or grow in space -- how vertical farms could be ready to take-off
14.07.2020 | John Innes Centre

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: AI & single-cell genomics

New software predicts cell fate

Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...

Im Focus: TU Graz Researchers synthesize nanoparticles tailored for special applications

“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.

Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...

Im Focus: Tailored light inspired by nature

An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.

Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...

Im Focus: NYUAD astrophysicist investigates the possibility of life below the surface of Mars

  • A rover expected to explore below the surface of Mars in 2022 has the potential to provide more insights
  • The findings published in Scientific Reports, Springer Nature suggests the presence of traces of water on Mars, raising the question of the possibility of a life-supporting environment

Although no life has been detected on the Martian surface, a new study from astrophysicist and research scientist at the Center for Space Science at NYU Abu...

Im Focus: Manipulating non-magnetic atoms in a chromium halide enables tuning of magnetic properties

New approach creates synthetic layered magnets with unprecedented level of control over their magnetic properties

The magnetic properties of a chromium halide can be tuned by manipulating the non-magnetic atoms in the material, a team, led by Boston College researchers,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

“Conference on Laser Polishing – LaP 2020”: The final touches for surfaces

23.07.2020 | Event News

Conference radar for cybersecurity

21.07.2020 | Event News

Contact Tracing Apps against COVID-19: German National Academy Leopoldina hosts international virtual panel discussion

07.07.2020 | Event News

 
Latest News

First radio detection of an extrasolar planetary system around a main-sequence star

04.08.2020 | Physics and Astronomy

The art of making tiny holes

04.08.2020 | Physics and Astronomy

Early Mars was covered in ice sheets, not flowing rivers

04.08.2020 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>