1. Notes for teachers
This presentation has been designed to complement the information provided in the Plant Phenomics Teacher Resource.
Some of the slides in this presentation have additional notes, but most of the slides are self-explanatory.
© Australian Plant Phenomics Facility 2013

2. Plant phenomics Notes for teachers
Phenomics is essentially a way of speeding up phenotyping using high-tech imaging systems and computing power.
The next slide contains background information about genotypes, phenotypes and phenotyping.

3. Some background information
A plant’s genotype is all of its genes.
A plant’s phenotype is how it looks and performs:
a plant’s phenotype is a combination of its genotype and the environment it grows in
plants with the same genotype can have different phenotypes.
Phenotyping is analysing a plant’s phenotype.
Phenomics is a way of speeding up phenotyping using high-tech imaging systems and computing power.

4. Why is plant phenomics important?
By 2050, 9.1 billion people will populate the planet.
We will need to produce approximately 70 per cent more food to feed them, under tougher climate conditions.
This is one of humanity’s greatest challenges.
How can we do it?
Three of the possible ways to help:
Improve crop yields
Breed crops that can cope with climate change
Develop biofuel crops that don’t compete with food crops.
Notes for teachers
Some Australian research projects are outlined after the technology section.

5. What does plant phenomics involve?
Phenomics borrows imaging techniques from medicine to allow researchers to study the inner workings of leaves, roots or whole plants.
Some phenomics techniques are:
• 3D imaging
• infrared imaging
• fluorescence imaging
• magnetic resonance imaging
spectral reflectance.
Notes for teachers
These phenomics techniques are explained in the following slides. The image shows an infrared image of cotton seedlings.

6. Three-dimensional (3D) imaging
Digital photos of the top and sides of plants are combined into a 3D image.
Measurements that can be taken using a 3D image include:
• shoot mass
• leaf number, shape and angle
• leaf colour
• leaf health.
Notes for teachers
The image shows a computer-generated 3D model of a cotton plant.

7. 3D imaging
Notes for teachers
Once data has been obtained, the computer models can be used to determine features such as overall plant size and height, leaf growth over time, orientation of leaf surfaces, leaf angles and number of leaves.
A cotton plant prepared for imaging (above), and a 3D model (right)

8. 3D imaging - PlantScan
Pots of plants move on a conveyor belt through an imaging chamber.
The 3D models are automatically generated by a computer program.
Notes for teachers
The PlantScan system shown can monitor plants non-destructively over time, allowing growth to be measured at different ages.
The system can handle plants up to 2.0m in height and 1.5m in width.
A double conveyor-belt system is manually loaded with plants held in position on pot carriers, and the pots are then accurately positioned for imaging. A rotating/lifting device allows the plant to be screened from all sides.
The image shows a Pongamia plant inside the imaging chamber.

9. 3D imaging - TrayScan
The TrayScan system holds a mini-conveyor belt that cycles trays of plants through a high- tech array of cameras.
Each tray is labelled with a barcode so that plants can be easily identified.
Notes for teachers
Like the PlantScan system in the previous slide, the TrayScan system shown can also monitor plants non-destructively over time, allowing growth to be measured at different ages.

10. Far-infrared (FIR) imaging
FIR cameras are used to study temperature.
They use light in the FIR region of the spectrum (15–1000 μm).
Temperature differences can be used to study:
salinity tolerance
water usage
photosynthesis efficiency.
Notes for teachers:
The image shows a researcher holding a special sheet used to calibrate the infrared sensors on the imaging system.

11. Far-infrared (FIR) imaging
Cooler plants have better root systems and take up more water.
FIR imaging can be used for individual plants or for whole crops.

12. Fluorescence imaging
Fluorescence imaging is used to study plant health and photosynthesis.
Fluorescence occurs when an object absorbs light of one wavelength and gives off light of a different wavelength.
Chlorophyll fluorescence is used to study the effect of different genes or environmental conditions on the efficiency of photosynthesis.
Notes for teachers
The picture shows the result after a computer program converts the resulting fluorescence of a Brachypodium seedling into false-colour signals. The images allow instant analysis of plant health.

13. Magnetic resonance imaging (MRI)
Magnetic resonance imaging (MRI) is used to study plant roots.
MRI uses a magnetic field and radio waves to take images of roots in the same way as for imaging body organs in medicine.
MRI allows the 3D geometry of roots to be viewed just as if the plant was growing in the soil.
Notes for teachers
This MRI image shows the effect of temperature on root growth. Both the growth rate and formation of lateral roots are affected at the lower temperature.

14. Spectral reflectance
Spectral reflectance is the fraction of light reflected by a non-transparent surface.
Researchers can use spectral reflectance to tell if a plant is stressed by saline soil or drought, well before it can be seen by eye.
A hyperspectral camera measures all wavelengths of light that are either reflected or absorbed by a plant.
Notes for teachers:
In images taken with a normal camera, each pixel has only three bands, or colours: red, green and blue, shown on the graph. In contrast, each pixel in an image taken by the hyperspectral camera contains 340 bands that span the entire visible and near infrared spectrum – this is the white line on the same graph.

15. Plant phenomics in the field
Phenomics remote sensing technology allows researchers to study plants in the field.
Measurements can be taken on many plants at once, and over a whole growing season
Some examples of phenomics field technology are:
Phenonet sensor network
Phenomobile
Phenotower
Multicopter.
Notes for teachers
Each example of phenomics field technology is described in the following slides.

16. Phenonet sensor network
A network of data loggers collects information from a field of crops and sends it through the mobile phone network to researchers at the lab.
Sensors include:
far infrared thermometer
weather station
soil moisture sensor
thermistor (soil temperature)
Notes for teachers:
Sensors remotely monitor plant performance as the environment changes throughout the season. The Phenonet’s modules are self-contained PVC tubes containing a battery, sensors, radio transmitter and microprocessor. More than 500 modules are in use at four field sites across Australia.

17. Phenomobile
The phenomobile is a modified golf buggy that moves through a field of plants, taking measurements as is travels along.
As a researcher drives the Phenomobile travels through the field site at 3–5 km per hour, it collects measurements from the plot directly beneath it.

18. Phenomobile The phenomobile carries equipment to measure:
leaf greenness and ground cover
canopy temperature
volume (biomass) of plants, plant height and plant density
crop chemical composition.
FOV α

19. Phenotower
The phenotower is a cherry picker used to take images of crops 15 m above the ground.
Notes for teachers:
The top smaller image show the field under visible light, and the bottom is taken using an infrared camera.

20. Multicopter
The Multicopter can take infrared and colour images of a field from just a few centimetres above the ground to a height of up to 100 metres.
Notes to teachers: The Multicopter is less than one metre across, and has six propellers. It can be remotely controlled, and can also be programmed to follow an automatic flight path. It can quickly image an entire field of crop plants, helping researchers take measurements of many plants at the same time.

21. Where is plant phenomics research done in Australia?
The Australian Plant Phenomics Facility has three nodes:
Adelaide: The Plant Accelerator, University of Adelaide
Canberra: High Resolution Plant Phenomics Centre, CSIRO
Canberra: Plant Phenomics Facility, Australian National University

22. High Resolution Plant Phenomics Centre
The Centre’s researchers develop new ways to discover the function of genes and to screen plant varieties for useful agricultural traits.
Researchers can grow plants in growth cabinets or in the field.

23. Plant Accelerator
A high-tech glasshouse contains plant conveyor systems, imaging, robotic and computing equipment.
Notes for teachers:
Using automated systems like these, researchers can screen thousands of plants in a short time.

24. Research: Improving crop yields
Yearly crop yield gains have slowed to the point of stagnation.
Population growth + lack of suitable land + competition from biofuel crops + fertiliser costs + lack of water + climate change = potential global food crisis.
Phenomics projects:
‘Supercharging’ photosynthesis
Improving wheat yield
Brachypodium – the cereal ‘lab rat’
Notes to teachers:
The image shows experimental plots of wheat and corn plants. Breeding higher-yielding crops such as these is an important goal for plant researchers.
Image credit: CSIRO Plant Industry

25. ‘Supercharging’ photosynthesis
Plants have two major photosynthetic mechanisms: C3 and C4. Phenomics researchers want to replace the C3 pathway of rice with a more efficient C4 mechanism.
C4 plants can concentrate carbon dioxide inside the leaf, and photosynthesise more efficiently than C3 plants, especially under:
higher temperatures
drought conditions
limited nitrogen supplies.
Notes for teachers:
In C3 plants such as rice (top), the leaf mesophyll cells (red) take up carbon dioxide and also fix carbon during photosynthesis.
In C4 plants such as maize (bottom), the leaf mesophyll cells (red) pump carbon dioxide into specialised bundle-sheath cells (yellow and red), where carbon is later fixed during photosynthesis.

26. Improving wheat yield
A major limiting factor in photosynthetic performance is the inefficiency of the enzyme Rubisco.
Some plants have better Rubiscos than others.
Phenomics researchers are searching through thousands of wheat varieties for those:
with a better-performing Rubisco and higher rates of photosynthesis
that can grow well under nutrient deficiency, drought and salinity.
Notes for teachers:
The image shows salt-tolerant durum wheat.
Image credit: CSIRO Plant Industry

27. Brachypodium – the cereal ‘lab rat’
Phenomics researchers are using a small wild grass called Brachypodium distachyon as a wheat ‘lab rat’.
Brachypodium’s entire genome is known, and it has many genes in common with wheat.
Researchers are studying Brachypodium root formation to speed up understanding of wheat roots.
Notes to teachers:
Brachypodium is a ‘model’ cereal plant. ‘Model’ plants that grow faster and have all their genetic information available make it easier to understand the genes responsible for growth and yield in food crops.
The image shows the root system of a Brachypodium seedling. The image is taken on a flatbed scanner, and the plant is floated on a small amoutn of water in a clear plastic tray to allow high-contrast images to be taken.

28. Research: Crops to cope with climate change
Climate change is predicted to make crop growing conditions tougher in the future.
Phenomics researchers are developing:
• drought-tolerant wheat
• salt-tolerant wheat and barley.
Notes to teachers:
The image shows a drought and salinity-affected landscape.
Image credit: Willem van Aken, CSIRO

29. Drought-tolerant wheat
Crops use different amounts of water at different growth stages and under different environmental conditions.
To breed drought-tolerant wheat, researchers have to study performance in the field over a whole growing season.
Phenomics remote sensing technology can measure:
if plants are stressed by drought conditions
canopy temperature
weather and soil data.
Notes for teachers:
The image shows one of the Phenonet’s system of sensors in an experimental plot.

30. Salt-tolerant wheat and barley
CSIRO researchers are screening wheat and barley growing in saline conditions for salt-tolerant varieties.
Plants grown in salty soil close their stomata to reduce water loss. This:
slows photosynthesis and reduces yield
heats the leaves.
Infrared cameras can quickly identify which plants are cooler, and are keeping their stomata open.
Plant grown in salty soil (warmer)
Plant grown in normal soil (cooler)

31. Research: Non-food crop biofuels
Biofuels are often produced using food crops such as corn and soybeans.
Researchers are trialling non- food plants to produce biofuels. These crops will need to:
grow on less productive land ‘marginal’ land
tolerate stresses, such as low water availability, salinity or low nutrient supplies.
Switchgrass (Panicum virgatum) is showing promise as a biofuel feedstock.
Notes for teachers:
Phenomics researchers are using the model plant, Brachypodium distachyon, to speed up the process of breeding switchgrass for biofuel production.