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Integrons in Xanthomonas pathovars: Do they have a role in plant pathogenicity? Bacteria in the genus Xanthomonas cause serious diseases of plants, identification being based on the plant species from which they were originally recovered. Xanthomonads contain integrons, genetic elements capable of acquiring and expressing diverse genes. In other bacterial groups, the gene content of integrons varies significantly between strains of the same species, and in many cases these genes code for cell su ....Integrons in Xanthomonas pathovars: Do they have a role in plant pathogenicity? Bacteria in the genus Xanthomonas cause serious diseases of plants, identification being based on the plant species from which they were originally recovered. Xanthomonads contain integrons, genetic elements capable of acquiring and expressing diverse genes. In other bacterial groups, the gene content of integrons varies significantly between strains of the same species, and in many cases these genes code for cell surface proteins. These characteristics are precisely those we might expect to be responsible for interactions between plants and bacteria. This project aims to examine a large collection of xanthomonads for integrons, and determine whether particular integron gene contents are associated with host-pathogen specificity.
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Engineering plants via modified microtubule dynamics. The plant microtubule cytoskeleton is involved in many economically important functions such as controlling growth and development, cellulose deposition, and responses to pathogens and salinity. This project will increase our understanding of how the regulation of the microtubule cytoskeleton affects these processes and move us nearer to achieving economically important goals, such as the development of crop plants with improved traits. Thi ....Engineering plants via modified microtubule dynamics. The plant microtubule cytoskeleton is involved in many economically important functions such as controlling growth and development, cellulose deposition, and responses to pathogens and salinity. This project will increase our understanding of how the regulation of the microtubule cytoskeleton affects these processes and move us nearer to achieving economically important goals, such as the development of crop plants with improved traits. This project will also help maintain Australia's position at the forefront of plant cell and molecular biology.Read moreRead less
Comparative Biophysical Studies on Photosystem II of Higher Plants and Cyanobacteria. Photosystem II (PS-II) is one of two light trapping protein assemblies involved in the conversion of light into metabolic energy in all plants and algae. The manganese containing active site of PS-II is responsible for oxygen formation from water. The organisation and functioning of this centre and the detailed mechanism of photochemical energy conversion are not understood. This project will employ a combinati ....Comparative Biophysical Studies on Photosystem II of Higher Plants and Cyanobacteria. Photosystem II (PS-II) is one of two light trapping protein assemblies involved in the conversion of light into metabolic energy in all plants and algae. The manganese containing active site of PS-II is responsible for oxygen formation from water. The organisation and functioning of this centre and the detailed mechanism of photochemical energy conversion are not understood. This project will employ a combination of powerful biophysical techniques to probe the structure and mechanism of PS-II as a knowledge base for eventual genetic manipulation of plants and stategies for artificial photosynthesis.Read moreRead less
Control of Wolbachia replication: maintaining a stable symbiosis. This project will use a comparative genomics approach to better understand how Wolbachia infections of insects are able to maintain themselves in insects without causing pathology. The results will allow us to better understand a distinguishing characteristic of an intracellular symbiont, namely replication control. The results also have the potential to lead to new approaches to insect pest control through a better understanding ....Control of Wolbachia replication: maintaining a stable symbiosis. This project will use a comparative genomics approach to better understand how Wolbachia infections of insects are able to maintain themselves in insects without causing pathology. The results will allow us to better understand a distinguishing characteristic of an intracellular symbiont, namely replication control. The results also have the potential to lead to new approaches to insect pest control through a better understanding of how Wolbachia might be used to skew insect population age structure.Read moreRead less
Functional characterisation of novel transport protein in plants. The products of plants provide the food we eat, the air we breath and it is recognised that they play an integral role in defining and protecting the environment. Thus it is essential to understand how plant work to allow their use in novel applications and to adapt to changing environments. Many aspects of plant metabolism are unique to plants and thus we cannot guess or estimate importance from studies in animals or fungi. Appro ....Functional characterisation of novel transport protein in plants. The products of plants provide the food we eat, the air we breath and it is recognised that they play an integral role in defining and protecting the environment. Thus it is essential to understand how plant work to allow their use in novel applications and to adapt to changing environments. Many aspects of plant metabolism are unique to plants and thus we cannot guess or estimate importance from studies in animals or fungi. Approximately 4,000 proteins are specific to plants, or contain domains that are unique to plants. This investigation proposes to elucidate the function of some of these novel proteins, transporters, that play a critical role in transport processes in cells.Read moreRead less
Molecular Genetic Analysis of Genes Regulating Metabolism in the Fungus Aspergillus nidulans. Filamentous fungi can use a wide variety of sources of carbon and nitrogen. In order to grow on these compounds metabolism is adjusted in response to changes in nutrient availability. Patterns of genome expression are altered by signalling to global regulatory genes which control the transcription of genes producing enzymes appropriate to the substrates available. This is of fundamental significance to ....Molecular Genetic Analysis of Genes Regulating Metabolism in the Fungus Aspergillus nidulans. Filamentous fungi can use a wide variety of sources of carbon and nitrogen. In order to grow on these compounds metabolism is adjusted in response to changes in nutrient availability. Patterns of genome expression are altered by signalling to global regulatory genes which control the transcription of genes producing enzymes appropriate to the substrates available. This is of fundamental significance to the physiology and development of fungi which include devastating pathogens and species used in industrial microbiology. This project aims to use the excellent molecular genetics of the model fungus Aspergillus nidulans to investigate the strategies employed and the mechanisms involved.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
Functional genomics of light stress resistance in the model organism Chlamydomonas: combining molecular genetics, transcriptome and proteome analysis. This project aims at combining molecular genetics, transcriptome and proteome analysis to identify genes and pathways underlying high light stress tolerance in previously isolated mutants of the chlorophyte Chlamydomonas reinhardtii. Comprehensive profiles of transcriptome-proteome linkage will be constructed without the complications of multicel ....Functional genomics of light stress resistance in the model organism Chlamydomonas: combining molecular genetics, transcriptome and proteome analysis. This project aims at combining molecular genetics, transcriptome and proteome analysis to identify genes and pathways underlying high light stress tolerance in previously isolated mutants of the chlorophyte Chlamydomonas reinhardtii. Comprehensive profiles of transcriptome-proteome linkage will be constructed without the complications of multicellularity for this unicellular photosynthetic model organism. We will establish a public proteome reference database and provide new microarrays and molecular markers beneficial for research in Chlamydomonas. We expect to advance understanding of high light resistance mechanisms so that it will eventually be applicable to improve productivity in crop plants growing under various environmental stress conditions.Read moreRead less
Novel photoprotective mechanisms and functional biodiversity of high light tolerance in the model alga Chlamydomonas. Most plants have limited capacity to avoid high light (HL) stress which commonly accompanies drought and high temperature stress. We will identify novel genes and proteins that underlie diverse mechanisms of photoprotection in unique very high light resistant (VHLR) mutants in the alga Chlamydomonas and develop new tools to screen other plants for these attributes. Depending on p ....Novel photoprotective mechanisms and functional biodiversity of high light tolerance in the model alga Chlamydomonas. Most plants have limited capacity to avoid high light (HL) stress which commonly accompanies drought and high temperature stress. We will identify novel genes and proteins that underlie diverse mechanisms of photoprotection in unique very high light resistant (VHLR) mutants in the alga Chlamydomonas and develop new tools to screen other plants for these attributes. Depending on progress, we expect to express them in the higher plant Arabidopsis as a first step towards utilization of VHLR genes for crop improvement. Understanding the mechanisms conferring HL photoprotection is a research priority in plant sciences and will further strengthen Australia's innovative contributions to the internationally networked Chlamydomonas Genome Project.Read moreRead less
Identification of transcription factor genes involved in the regulation of aspects of photosynthetic capacity in plants. There is increasing evidence to suggest that we may be reaching a yield plateau with many agricultural plants and that future avenues for yield increases may depend on increases in photosynthetic capacity per unit leaf area. Molecular genetic technology offers the promise of the direct manipulation of photosynthetic gene expression to increase photosynthetic capacity. This pro ....Identification of transcription factor genes involved in the regulation of aspects of photosynthetic capacity in plants. There is increasing evidence to suggest that we may be reaching a yield plateau with many agricultural plants and that future avenues for yield increases may depend on increases in photosynthetic capacity per unit leaf area. Molecular genetic technology offers the promise of the direct manipulation of photosynthetic gene expression to increase photosynthetic capacity. This project aims to understand one important part of genetic regulation, the transcription factors, that may determine aspects of photosynthetic capacity. Altered expression of these transcription factors in transgenic plants will be used to test the their ability to control photosynthesis and generate agricultural intellectual property.Read moreRead less