Targeting and stabilizing proteins in sugar storage vacuoles for metabolic engineering in sugarcane. We have isolated a novel gene for an enzyme that efficiently converts sucrose into a product of much higher value. We have shown that the enzyme functions in sugarcane, a first example of the potential for new biosynthetic capacities in this highly productive crop. Because 90% of stored sucrose is in specialized vacuoles, the enzyme needs to be directed into these vacuoles, and made stable and ac ....Targeting and stabilizing proteins in sugar storage vacuoles for metabolic engineering in sugarcane. We have isolated a novel gene for an enzyme that efficiently converts sucrose into a product of much higher value. We have shown that the enzyme functions in sugarcane, a first example of the potential for new biosynthetic capacities in this highly productive crop. Because 90% of stored sucrose is in specialized vacuoles, the enzyme needs to be directed into these vacuoles, and made stable and active there. This is feasible by building on recent discoveries about vacuolar targeting in plants. The outputs include scientific understanding to underpin metabolic engineering in plants, and a profitable high-technology export industry for Australia.Read moreRead less
Metabolic engineering of sugarcane: production of a biodegradable bioplastic as a test-case. The aim of this project is to produce a commercially valuable bioplastic called PHB in transgenic sugarcane. This bioplastic has similar properties to petrochemically produced polypropylene, but is fully biodegradable. PHB has been produced in the model plant Arabidopsis thaliana at commercially viable levels. The expected outcome of high-level production of PHB in sugarcane would have significant ben ....Metabolic engineering of sugarcane: production of a biodegradable bioplastic as a test-case. The aim of this project is to produce a commercially valuable bioplastic called PHB in transgenic sugarcane. This bioplastic has similar properties to petrochemically produced polypropylene, but is fully biodegradable. PHB has been produced in the model plant Arabidopsis thaliana at commercially viable levels. The expected outcome of high-level production of PHB in sugarcane would have significant benefits to the Australian sugar industry, the rural economy, and the Australian environment.Read moreRead less
In vitro evolution of more thermostable dextranases for the Australian sugar industry. Dextrans are polysaccharides that adversely affect the productivity of sugarcane mills. The Australian sugar industry currently imports dextranases to deal with this problem but they are not heat stable so the mills have run at lower temperatures than optimal. We have isolated dextranases from thermophilic microorganisms and aim to improve their performance by generating superior heat-stable dextranases using ....In vitro evolution of more thermostable dextranases for the Australian sugar industry. Dextrans are polysaccharides that adversely affect the productivity of sugarcane mills. The Australian sugar industry currently imports dextranases to deal with this problem but they are not heat stable so the mills have run at lower temperatures than optimal. We have isolated dextranases from thermophilic microorganisms and aim to improve their performance by generating superior heat-stable dextranases using in vitro evolution, creating new activity levels by random mutation and recombination. The research will be significant in providing novel enzymes for domestic use, allowing import substitution and an outcome will be the development of a product with export potential.
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Understanding and avoiding transgene silencing in sugarcane. Sugarcane is one of the world's major crops for food (sugar) and fuel (ethanol, electricity co-generation). It is one of the most appealing target crops for metabolic engineering aimed at renewable biomaterials and biofuels. Australia has invested strongly to achieve scientific leadership in gene technologies in our major export crops including sugarcane. Field tests show that development of methods to avoid unstable expression or 'sil ....Understanding and avoiding transgene silencing in sugarcane. Sugarcane is one of the world's major crops for food (sugar) and fuel (ethanol, electricity co-generation). It is one of the most appealing target crops for metabolic engineering aimed at renewable biomaterials and biofuels. Australia has invested strongly to achieve scientific leadership in gene technologies in our major export crops including sugarcane. Field tests show that development of methods to avoid unstable expression or 'silencing' of introduced genes is now a critical requirement for practical application. The current project emerges from industry recognition of the need to understand and avoid transgene silencing. The methods developed using sugarcane are expected to have rapid applicability for wider benefits in agriculture.Read moreRead less
Optimising transgene expression and stability for enhanced sugar yield and high-value sugar production in sugarcane. 'SugarBooster' technology has the potential to underpin a value-added sugarcane industry. Higher sucrose yield is a key to sustainable export profitability, and it makes the development of renewable biofuels from sugarcane more feasible. Isomaltulose has established health benefits for consumers and it is also attractive as a renewable starting material for industry. But it must c ....Optimising transgene expression and stability for enhanced sugar yield and high-value sugar production in sugarcane. 'SugarBooster' technology has the potential to underpin a value-added sugarcane industry. Higher sucrose yield is a key to sustainable export profitability, and it makes the development of renewable biofuels from sugarcane more feasible. Isomaltulose has established health benefits for consumers and it is also attractive as a renewable starting material for industry. But it must currently be produced by expensive fermentation. Efficient production in plants will open an increasing world market. This collaborative project is vital to bring these breakthrough technologies to reliable commercial implementation, in time to capture the economic benefits of the protected IP for Australia.Read moreRead less
Understanding an exotic disease: Initiation of sex and infection by the sugarcane smut Ustilago scitaminea. Australian sugar exports generate almost $2 billion in annual sales, making the sugar industry a critical facet of the Australian economy. In 2006, Australia's primary sugar producing region came under threat when an outbreak of sugarcane smut caused by the fungus Ustilago scitaminea first appeared in Queensland. Management of this potentially devastating disease has focused on breeding pr ....Understanding an exotic disease: Initiation of sex and infection by the sugarcane smut Ustilago scitaminea. Australian sugar exports generate almost $2 billion in annual sales, making the sugar industry a critical facet of the Australian economy. In 2006, Australia's primary sugar producing region came under threat when an outbreak of sugarcane smut caused by the fungus Ustilago scitaminea first appeared in Queensland. Management of this potentially devastating disease has focused on breeding programmes aimed at developing resistant sugarcane cultivars, a complex process hampered by a lack of information about the mechanisms of smut resistance. Our research will provide key insight into the mechanisms by which U. scitaminea infects sugarcane, directing future breeding efforts and protecting this valuable industry against further outbreaks.Read moreRead less
Enhanced biocontrol options for the Australian sugar industry: a proteomic approach. Sugarcane is the second largest field crop grown in Australia and raw sugar is the third largest export product. Canegrubs are the major insect pest affecting production of sugarcane in Australia, currently costing the industry more than $12 million annually in insecticides and lost production. Biological control of insect pests provides an environmentally sound option of reducing these losses. Here we propos ....Enhanced biocontrol options for the Australian sugar industry: a proteomic approach. Sugarcane is the second largest field crop grown in Australia and raw sugar is the third largest export product. Canegrubs are the major insect pest affecting production of sugarcane in Australia, currently costing the industry more than $12 million annually in insecticides and lost production. Biological control of insect pests provides an environmentally sound option of reducing these losses. Here we propose to use proteomics to identify the key pathogenicity determinants in the biological control fungus Metarhizium during infection of canegrubs. The genes and proteins identified in this project will contribute to developing enhanced biocontrol options for Australian sugar industry.Read moreRead less
Metabolic engineering of Zymomonas mobilis for higher value fermentation products. This project will provide an opportunity to revolutionise the Australian chemical and sugar industries. Unlike the traditional methods of the petrochemical industry, bioconversion of carbohydrates to chemicals such as succinic acid via fermentation is cosiderably environmental friendly. For the sugar industry this project will provide an opportunity to produce not only conventional sugar products but also high val ....Metabolic engineering of Zymomonas mobilis for higher value fermentation products. This project will provide an opportunity to revolutionise the Australian chemical and sugar industries. Unlike the traditional methods of the petrochemical industry, bioconversion of carbohydrates to chemicals such as succinic acid via fermentation is cosiderably environmental friendly. For the sugar industry this project will provide an opportunity to produce not only conventional sugar products but also high value commodities via the process integration of succinic acid production using agricultural residues such as bagasse. This will contribute to significant levels of job creation in Australia, and further benefits will be that such products will be important both for import replacement and export potential.Read moreRead less
A New Window into Transgene Silencing in Plants: mechanisms of copy-number independent, 5' sequence dependent, post-transcriptional silencing in a complex polyploid. Silencing of introduced genes is a major problem limiting plant molecular improvement. Sugarcane, a complex polyploid, shows the most efficient transgene silencing ever observed in plants. Silencing operates on the RNA, depends on the upstream sequence of the gene, and is independent of copy number. Other plant species develop endop ....A New Window into Transgene Silencing in Plants: mechanisms of copy-number independent, 5' sequence dependent, post-transcriptional silencing in a complex polyploid. Silencing of introduced genes is a major problem limiting plant molecular improvement. Sugarcane, a complex polyploid, shows the most efficient transgene silencing ever observed in plants. Silencing operates on the RNA, depends on the upstream sequence of the gene, and is independent of copy number. Other plant species develop endopolyploidy with age, and show unpredictable or patchy silencing. We speculate that differential silencing is a natural control mechanism in the exploitation of polyploidy in plants. The sugarcane system provides an exceptional opportunity to identify the sequences that trigger and protect from silencing, and to develop approaches to avoid the problem.Read moreRead less
Metabolic engineering to develop recombinant Zymomonas mobilis for the production of fuel ethanol and fermentation chemicals. This project will provide an opportunity to revolutionise the Australian chemical and sugar industries. Unlike the traditional methods of the petrochemical industry, bioconversion of carbohydrates to chemicals, such as succinic acid via fermentation is more considerably environmentally friendly. For the sugar industry this project will provide an opportunity to produce no ....Metabolic engineering to develop recombinant Zymomonas mobilis for the production of fuel ethanol and fermentation chemicals. This project will provide an opportunity to revolutionise the Australian chemical and sugar industries. Unlike the traditional methods of the petrochemical industry, bioconversion of carbohydrates to chemicals, such as succinic acid via fermentation is more considerably environmentally friendly. For the sugar industry this project will provide an opportunity to produce not only conventional sugar products but also high value commodities via the process integration of succinic acid production using agricultural residues, such as bagasse. This will contribute to significant levels of job creation in Australia, with the further benefit that such products will be important for both import replacement and export potential.Read moreRead less