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The dual nature of trehalose in citrus canker disease: A virulence factor for Xanthomonas citri subsp. citri and a trigger for plant defence responses
(Oxford University Press, 2015-05)
Xanthomonas citri subsp. citri (Xcc) is a bacterial pathogen that causes citrus canker in susceptible Citrus spp. The Xcc genome contains genes encoding enzymes from three separate pathways of trehalose biosynthesis. ...
Absence of trehalose synthesis in Acidithiobacillus ferrooxidans ATCC 23270 and Acidithiobacillus ferrivorans CF27 at low temperatureAusencia de síntesis de trehalosa en Acidithiobacillus ferrooxidans ATCC 23270 y Acidithiobacillus ferrivorans CF27 a baja temperatura
(Universidad Nacional Mayor de San Marcos, Facultad de Ciencias Biológicas, 2023)
Feedback inhibition of starch degradation in Arabidopsis leaves mediated by trehalose 6-phosphate
(American Society of Plant Biologist, 2013-11)
Many plants accumulate substantial starch reserves in their leaves during the day and remobilize them at night to provide carbon and energy for maintenance and growth. In this paper, we explore the role of a sugar-signaling metabolite, trehalose-6-phosphate (Tre6P), in regulating the accumulation and turnover of transitory starch in Arabidopsis (Arabidopsis thaliana) leaves. Ethanol-induced overexpression of trehalose-phosphate synthase during the day increased Tre6P levels up to 11-fold. There was a transient increase in the rate of starch accumulation in the middle of the day, but this was not linked to reductive activation of ADP-glucose pyrophosphorylase. A 2- to 3-fold increase in Tre6P during the night led to significant inhibition of starch degradation. Maltose and maltotriose did not accumulate, suggesting that Tre6P affects an early step in the pathway of starch degradation in the chloroplasts. Starch granules isolated from induced plants had a higher orthophosphate content than granules from noninduced control plants, consistent either with disruption of the phosphorylation-dephosphorylation cycle that is essential for efficient starch breakdown or with inhibition of starch hydrolysis by beta-amylase. Nonaqueous fractionation of leaves showed that Tre6P is predominantly located in the cytosol, with estimated in vivo Tre6P concentrations of 4 to 7 µM in the cytosol, 0.2 to 0.5 µM in the chloroplasts, and 0.05 µM in the vacuole. It is proposed that Tre6P is a component in a signaling pathway that mediates the feedback regulation of starch breakdown by sucrose, potentially linking starch turnover to demand for sucrose by growing sink organs at night....
New Insights in the Use of Trehalose and Modified Starches for the Encapsulation of Orange Essential Oil
(Springer, 2014-09)
During the encapsulation of aromas by spray-drying, some volatile components may be lost; consequently, the sensory profile could be modified in the final product. Therefore, the selection of the carrier matrix for the ...
The production and utilization of GDP-glucose in the biosynthesis of trehalose-6-phosphate by Streptomyces venezuelae
(American Society for Biochemistry and Molecular Biology, 2017-01)
Trehalose-6-phosphate synthase OtsA from streptomycetes is unusual in that it uses GDP-glucose as the donor substrate rather than the more commonly used UDP-glucose. We now confirm that OtsA from Streptomyces venezuelae ...
A Tale of Two Sugars: Trehalose 6-Phosphate and Sucrose
(American Society of Plant Biologist, 2016-09)
Trehalose 6-phosphate (Tre6P), the intermediate of trehalose biosynthesis, is an essential signal metabolite in plants, linking growth and development to carbon status. The Suc-Tre6P nexus model postulates that Tre6P is ...
The production and utilization of GDP-glucose in the biosynthesis of trehalose 6-phosphate by streptomyces venezuelae
(American Society for Biochemistry and Molecular Biology, 2017-01)
Trehalose-6-phosphate synthase OtsA from streptomycetes is unusual in that it uses GDP-glucose as the donor substrate rather than the more commonly used UDP-glucose. We now confirm that OtsA from Streptomyces venezuelae ...
Biochemical and physiological responses of sugarcane cultivars to soil water deficiencies
(Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ), 2011-08-01)
For sugarcane (Saccharum spp.) crops, the effects of an environmental stress, especially water deficiency, may cause severe productivity reduction, inferring negatively in the sugarcane industry. The tolerance of two ...