Stagonospora nodorum is a necrotrophic fungal pathogen that is the causal agent of leaf and glume blotch on wheat. S. nodorum is a polycyclic pathogen, whereby rain-splashed pycnidiospores attach to and colonise wheat tissue and subsequently sporulate again within 2-3weeks. As several cycles of infection are needed for a damaging infection, asexual sporulation is a critical phase of its infection cycle. A non-targeted metabolomics screen for sporulation-associated metabolites identified that trehalose accumulated significantly in concert with asexual sporulation both in vitro and in planta. A reverse-genetics approach was used to investigate the role of trehalose in asexual sporulation. Trehalose biosynthesis was disrupted by deletion of the gene Tps1, encoding a trehalose 6-phosphate synthase, resulting in almost total loss of trehalose during in vitro growth and in planta. In addition, lesion development and pycnidia formation were also significantly reduced in tps1 mutants. Reintroduction of the Tps1 gene restored trehalose biosynthesis, pathogenicity and sporulation to wild-type levels. Microscopic examination of tps1 infected wheat leaves showed that pycnidial formation often halted at an early stage of development. Further examination of the tps1 phenotype revealed that tps1 pycnidiospores exhibited a reduced germination rate while under heat stress, and tps1 mutants had a reduced growth rate while under oxidative stress. This study confirms a link between trehalose biosynthesis and pathogen fitness in S.nodorum.
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http://dx.doi.org/10.1016/j.fgb.2009.02.002 | DOI Listing |
Glucose-6-Phosphatase (G6Pase), a key enzyme in gluconeogenesis and glycogenolysis in the mammalian liver and kidney, converts glucose-6-phosphate to glucose for maintaining systemic blood glucose homeostasis during nutrient deprivation. However, its function has remained elusive in insects, which have no need for G6Pase in sugar homeostasis since they convert glucose-6-phosphate to trehalose, their main circulating sugar, via trehalose phosphate synthase (TPS1). In this study we identify an unexpected and essential requirement for G6Pase in male fertility, specifically to produce motile sperm.
View Article and Find Full Text PDFScience
January 2025
Department of Evolution and Ecology, University of California, Davis, CA, USA.
Appl Microbiol Biotechnol
December 2024
Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), Ruta Provincial 226 Km 73.5, B7620, Balcarce, Buenos Aires, Argentina.
Azospirillum argentinense Az19 is an osmotolerant plant growth-promoting bacterium that protects maize plants from drought. In this work, we explored the role of trehalose in the superior performance of Az19 under stress. The trehalase-coding gene treF was constitutively expressed in Az19 through a miniTn7 system.
View Article and Find Full Text PDFJ Fungi (Basel)
December 2024
Cooperative Innovation Center of Industrial Fermentation (Ministry of Education and Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, School of Life and Health Sciences, Hubei University of Technology, Wuhan 430068, China.
is a typical aroma-producing yeast in food brewing, but it has low heat resistance and poor proliferation ability at high temperature. Trehalose is generally considered to be a protective agent that helps stable yeast cells resist heat shock stress, but its functional mechanism for yeast cells in the adaptation period under heat stress is unclear. In this study, the physiological metabolism changes, specific gene transcription expression characteristics, and transcriptome differences of under different carbon sources under high-temperature stress (40 °C) were compared to explore the mechanism of trehalose inducing to recover and proliferate under high-temperature stress during the adaptation period.
View Article and Find Full Text PDFPlant Physiol Biochem
December 2024
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, 361104, PR China. Electronic address:
Trehalose has an important function for alleviating various abiotic stress in plants. Nevertheless, the functional and evolutionary characteristics of trehalose biosynthesis genes in mangrove plants is not documented. Here, using typical mangrove Avicennia marina, we found the trehalose content decreased in the roots and leaves and T6P increased significantly in the leaves under tidal submergence.
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