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GrainGenes Reference Report: PNA-99-15898

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Reference	PNA-99-15898
Title	Trehalose accumulation in rice plants confers high tolerance levels to different abiotic stresses
Journal	Proceedings of the National Academy of Sciences, USA
Year	2002
Volume	99
Pages	15898-15903
Author	Garg AK [ Show all 7 ]
Abstract	Summary: Trehalose is a nonreducing disaccharide of glucose that functions as a compatible solute in the stabilization of biological structures under abiotic stress in bacteria, fungi, and invertebrates. With the notable exception of the desiccation-tolerant 'resurrection plants,' trehalose is not thought to accumulate to detectable levels in most plants. We report here the regulated overexpression of Escherichia coli trehalose biosynthetic genes (otsA and otsB) as a fusion gene for manipulating abiotic stress tolerance in rice. The fusion gene has the advantages of necessitating only a single transformation event and a higher net catalytic efficiency for trehalose formation. The expression of the transgene was under the control of either tissue-specific or stress-dependent promoters. Compared with nontransgenic rice, several independent transgenic lines exhibited sustained plant growth, less photo-oxidative damage, and more favorable mineral balance under salt, drought, and low-temperature stress conditions. Depending on growth conditions, the transgenic rice plants accumulate trehalose at levels 3-10 times that of the nontransgenic controls. The observation that peak trehalose levels remain well below 1 mg/g fresh weight indicates that the primary effect of trehalose is not as a compatible solute. Rather, increased trehalose accumulation correlates with higher soluble carbohydrate levels and an elevated capacity for photosynthesis under both stress and nonstress conditions, consistent with a suggested role in modulating sugar sensing and carbohydrate metabolism. These findings demonstrate the feasibility of engineering rice for increased tolerance of abiotic stress and enhanced productivity through tissue-specific or stress-dependent overproduction of trehalose
Keyword	[ Hide all but 1 of 51 ] abiotic stress abiotic stress tolerance abiotic stresses bacteria bacterium capacity carbohydrate metabolism cold tolerance compatible solute control damage drought drought resistance fungi fusion fusion gene gene gene expression gene transfer genetic transformation glucose growth hexosyltransferases low temperature low temperature stress metabolism mineral oryza sativa overexpression phosphoric monoester hydrolases photosynthesis plant composition plant growth productivity recombinant dna rice salt salt tolerance stabilization stress stress tolerance sugar sugar sensing tolerance transformation transgene transgenic transgenic plant transgenic rice transgenic rice plants trehalose

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