The genes, Lr34 and Yr18 are inherited together and provide wheat plants with improved protection against leaf rust and stripe rust – two major diseases of wheat in Australia and worldwide.
CSIRO Plant Industry scientist, Dr Evans Lagudah, says various types of rust resistance have been bred into Australian varieties but work against a specific rust species and in some cases are only effective against a limited range of rust strains.
"We have identified a ‘DNA marker’ that is 99 per cent effective in flagging the presence of Lr34 and Yr18, which provide resistance against different species and strains of rust," Dr Lagudah says.
"This means that breeders can track the presence of this rust resistance through a simple DNA test. If the marker is present then it’s almost guaranteed Lr34 / Yr18 will be too."
Plant breeders have long recognised the usefulness of Lr34 / Yr18, which work together with other rust resistance genes to boost the plants’ capacity to defend itself.
Wheat plants that contain the Lr34 / Yr18 combination of genes also experience slower rates of rust infection. This prevents widespread and rapid increase of rust spores reducing the potential for disease epidemics throughout the crop.
"Up until now it has been difficult to track Lr34 / Yr18 in wheat because of the masking effect of other resistance genes," Dr Lagudah says.
"In addition, tests for Lr34 / Yr18 were slow and could only be done once per season and on adult plants growing in the paddock.
"Using the marker technology breeders can now quickly and easily test seedlings for the presence of Lr34 / Yr18, to establish known and unknown genes, and ideally combine different sources of resistance to speed up the delivery of new rust resistant wheat varieties."
The marker has proven effective in a range of wheats from different backgrounds including from Australia, India, China, North America and the major wheat research centre, CIMMYT.
Breeders in Australia and across the world are now using the marker so that the durable rust resistance offered by Lr34 / Yr18 can be incorporated into locally adapted wheat varieties.
Sophie Clayton | EurekAlert!
A room with a view - or how cultural differences matter in room size perception
25.04.2017 | Max-Planck-Institut für biologische Kybernetik
Studying a catalyst for blood cancers
25.04.2017 | University of Miami Miller School of Medicine
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
25.04.2017 | Earth Sciences
25.04.2017 | Life Sciences
25.04.2017 | Earth Sciences