HOW ONE SORGHUM GENE COULD HELP TO FEED THE WORLD
University of Queensland scientists have identified a sorghum gene which could lead to development of more digestible feedstocks for farm animals and much-improved nutrition for some of the world's poorest nations.
Known around the world for its drought-tolerance and florid heads of grain at harvest time, a more digestible sorghum would allow better uptake of vital nutrients.
For people living on marginalised farmland and dependent on sorghum as a fodder or food crop, these findings could prove to be life-saving, while also maximising water and land-use efficiency.
A team led by UQ plant scientist Professor Ian Godwin and colleagues from the Queensland Alliance for Agriculture and Food Science (QAAFI) has shown that selecting for a specific sorghum gene could mean the grain from these hardy plants will be much easier to digest.
“Sorghum is drought tolerant and can grow in regions otherwise unfit for other cereals, but unfortunately suffers from lower digestibility compared with other cereals,” Professor Godwin said.
“Most importantly, while the gene identified appears to improve digestibility, the gene's presence does not appear to diminish a sorghum plant's growth or yield.”
Queensland Minister for Agriculture, Fisheries and Forestry John McVeigh said the research was a major boost for Queensland, with sorghum already contributing an estimated $600 million to the rural economy annually.
“Any improvement to the digestibility of sorghum will add value to the grain and have a knock-on effect for the myriad of rural producers who use sorghum as a feedstock,” Mr McVeigh said.
“This is a significant milestone for the UQ and Department of Agriculture, Fisheries and Forestry scientists who have been working on the project.
“We have a goal to double the value of our food production by 2040 and this is another step in the right direction towards fulfilling that commitment and making Queensland a world leader in food and fibre production.”
While the gene variant is at low frequency in most sorghum populations, QAAFI scientist A/Professor David Jordan and collaborators at the Queensland Department of Agriculture, Fisheries and Forestry have shown that the gene is already in elite germplasm, arising from their sorghum pre-breeding program.
Preliminary studies have been done using a lab system which mimics monogastric digestion. UQ postdoc Dr Ed Gilding has demonstrated the variant gene leads to higher activity of an enzyme involved in starch biosynthesis in the developing grain.
Next step in the research will be to grow significant quantities of the selected sorghum line to test its digestibility, initially, in pigs and poultry.
The group's findings are published in Nature Communications.
Media: Professor Ian Godwin +61 7 3365 2141 or i.godwin@uq.edu.au
QAAFI background
Established in October 2010, the Queensland Alliance for Agriculture and Food Innovation (QAAFI) is an institute of The University of Queensland (UQ), which was formed through and alliance between UQ and the Queensland Government's Department of Agriculture, Fisheries and Forestry (DAFF).
QAAFI draws together some 100 research teams, specialising in plant, animal and food sciences from twelve UQ and DAFF sites across Queensland. QAAFI's long-term goal is to improve the competiveness and sustainability of tropical and sub-tropical food, fibre and agribusiness sectors through high-impact science.
Through science and innovation, the institute pursues research and collaborations that will lead to sustainable agriculture and food. Our objective is to be a world leading research institute in plant science, animal science, and nutrition and food sciences, delivering outcomes in discovery, learning, and engagement.
QAAFI Communications: 07 3346 0553 or 0417 425 510
http://www.uq.edu.au/news/?article=25871
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