Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Humble garden pea helps Kew scientists develop 'cool,' noninvasive diagnostic test of seed quality

02.02.2010
Scientists from Kew's Millennium Seed Bank in the United Kingdom and the University of Graz, Austria, have developed a rapid, new method to diagnose seed quality non-invasively and in real time. The results are published online in the Proceedings of the National Academy of Sciences and have great significance for conservation ecology and agriculture.

By using infrared temperature measurement, seed viability results are achieved in less than two hours. Until now time-consuming germination tests, taking up to three days, were used to assess seed quality. Conventional tests are also destructive, which is not ideal when assessing the seeds of rare and endangered plants.

Dr. Ilse Kranner, from Kew's Millennium Seed Bank, and Prof. Gerald Kastberger (University of Graz, Austria) found that infrared cameras can be used to detect subtle changes in temperature when seeds take up water. These changes vary with viability.

The thermal profiles of hundreds of garden pea seeds (Pisum sativum) were recorded. For each individual seed 22,000 images were analysed to construct a library of "thermal fingerprints" that allowed the scientists to distinguish between viable and dead seeds in less than two hours.

When a dry seed takes up water, the sugar within the seed dissolves, and this process cools the seed down. The temperature of a single pea seed falls rapidly by 2 to 3°C. Viable seeds maintain cool temperatures because they break down storage reserves into sugar.

In aged seeds, certain biophysical properties are affected that determine the speed of water uptake. Aged seeds also fail to break down their reserves, or can only break them down after a phase of repair, delaying the thermal profile. To date such processes were studied with destructive methods that involved grinding up seeds, whereas the new infrared-based method is a breakthrough in the non-invasive diagnosis of seed quality. It means viable seeds can be separated, re-dried and stored again.

Non-invasive techniques are widely used in medicine, for example CT scans of the body, and some airports also use infrared cameras to detect fever in passengers.

Importantly, the opportunity to select live and dead seeds prior to germination is a useful tool to improve studies into the fundamental principles of ageing and cell death, which are similar in plants, animals and humans. This research can potentially be applied in areas such as cancer research.

Wheat (Triticum aestivum) and rape seeds (Brassica napus) were also studied by the British-Austrian team to provide a proof of concept for agricultural seeds.

The seeds of 10% of the world's wild plant flora are safeguarded at Kew's Millennium Seed Bank at Wakehurst Place in West Sussex, with the aim to conserve a maximum of plant diversity for future generations.

Timelapse videos, showing the temperature changes in live and dead seeds, are available to view online www.pnas.org/cgi/doi/10.1073/pnas.0914197107

For more information and to set up interviews please contact Ilse Kranner at Kew's Millennium Seed Bank on +44(0)1444 894157 or email i.kranner@kew.org

Notes to editors

Noninvasive diagnosis of seed viability using infrared thermography
Ilse Kranner, Hugh W. Pritchard (Royal Botanic Gardens, Kew)
Gerald Kastberger, Manfred Hartbauer (Karl-Franzens-Universität Graz)
The Royal Botanic Gardens, Kew is a world famous scientific organisation, internationally respected for its outstanding living collection of plants and world-class Herbarium as well as its scientific expertise in plant diversity, conservation and sustainable development in the UK and around the world. Kew Gardens is a major international visitor attraction. Its landscaped, 132 hectares and RBG Kew's country estate, Wakehurst Place, attract nearly 2 million visitors every year. Kew was made a UNESCO World Heritage Site in July 2003 and celebrated its 250th anniversary in 2009. For further information please visit www.kew.org.

Wakehurst Place is also home to Kew's Millennium Seed Bank, the largest wild plant seed bank in the world. RBG Kew and its partners have collected and conserved seed from 10 per cent of the world's wild flowering plant species (c. 30,000 species). The aim is to conserve 25% by 2020 and funds are being actively sought in order to continue to develop this vital work. For further information please visit www.kew.org/msbp

Ilse Kranner | EurekAlert!
Further information:
http://www.kew.org
http://www.pnas.org/cgi/doi/10.1073/pnas.0914197107

More articles from Agricultural and Forestry Science:

nachricht Studies show integrated strategies work best for buffelgrass control
12.12.2019 | Cambridge University Press

nachricht The tips of a plant design its whole shape
09.12.2019 | Eberhard Karls Universität Tübingen

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: Cheers! Maxwell's electromagnetism extended to smaller scales

More than one hundred and fifty years have passed since the publication of James Clerk Maxwell's "A Dynamical Theory of the Electromagnetic Field" (1865). What would our lives be without this publication?

It is difficult to imagine, as this treatise revolutionized our fundamental understanding of electric fields, magnetic fields, and light. The twenty original...

Im Focus: Highly charged ion paves the way towards new physics

In a joint experimental and theoretical work performed at the Heidelberg Max Planck Institute for Nuclear Physics, an international team of physicists detected for the first time an orbital crossing in the highly charged ion Pr⁹⁺. Optical spectra were recorded employing an electron beam ion trap and analysed with the aid of atomic structure calculations. A proposed nHz-wide transition has been identified and its energy was determined with high precision. Theory predicts a very high sensitivity to new physics and extremely low susceptibility to external perturbations for this “clock line” making it a unique candidate for proposed precision studies.

Laser spectroscopy of neutral atoms and singly charged ions has reached astonishing precision by merit of a chain of technological advances during the past...

Im Focus: Ultrafast stimulated emission microscopy of single nanocrystals in Science

The ability to investigate the dynamics of single particle at the nano-scale and femtosecond level remained an unfathomed dream for years. It was not until the dawn of the 21st century that nanotechnology and femtoscience gradually merged together and the first ultrafast microscopy of individual quantum dots (QDs) and molecules was accomplished.

Ultrafast microscopy studies entirely rely on detecting nanoparticles or single molecules with luminescence techniques, which require efficient emitters to...

Im Focus: How to induce magnetism in graphene

Graphene, a two-dimensional structure made of carbon, is a material with excellent mechanical, electronic and optical properties. However, it did not seem suitable for magnetic applications. Together with international partners, Empa researchers have now succeeded in synthesizing a unique nanographene predicted in the 1970s, which conclusively demonstrates that carbon in very specific forms has magnetic properties that could permit future spintronic applications. The results have just been published in the renowned journal Nature Nanotechnology.

Depending on the shape and orientation of their edges, graphene nanostructures (also known as nanographenes) can have very different properties – for example,...

Im Focus: Electronic map reveals 'rules of the road' in superconductor

Band structure map exposes iron selenide's enigmatic electronic signature

Using a clever technique that causes unruly crystals of iron selenide to snap into alignment, Rice University physicists have drawn a detailed map that reveals...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

The Future of Work

03.12.2019 | Event News

First International Conference on Agrophotovoltaics in August 2020

15.11.2019 | Event News

Laser Symposium on Electromobility in Aachen: trends for the mobility revolution

15.11.2019 | Event News

 
Latest News

Weizmann physicists image electrons flowing like water

12.12.2019 | Physics and Astronomy

Revealing the physics of the Sun with Parker Solar Probe

12.12.2019 | Physics and Astronomy

New technique to determine protein structures may solve biomedical puzzles

12.12.2019 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>