Stress Enhances the Synthesis of Secondary Plant Products: The Impact of Stress-Related Over-Reduction on the Accumulation of Natural Products
Dirk Selmar,Maik Kleinwächter +1 more
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TLDR
Spice and medicinal plants grown under water deficiency conditions reveal much higher concentrations of relevant natural products compared with identical plants of the same species cultivated with an ample water supply, and a putative mechanistic concept considering general plant physiological and biochemical aspects is presented.Abstract:
Spice and medicinal plants grown under water deficiency conditions reveal much higher concentrations of relevant natural products compared with identical plants of the same species cultivated with an ample water supply. For the first time, experimental data related to this well-known phenomenon have been collected and a putative mechanistic concept considering general plant physiological and biochemical aspects is presented. Water shortage induces drought stress-related metabolic responses and, due to stomatal closure, the uptake of CO2 decreases significantly. As a result, the consumption of reduction equivalents (NADPH + H(+)) for CO2 fixation via the Calvin cycle declines considerably, generating a large oxidative stress and an oversupply of reduction equivalents. As a consequence, metabolic processes are shifted towards biosynthetic activities that consume reduction equivalents. Accordingly, the synthesis of reduced compounds, such as isoprenoids, phenols or alkaloids, is enhanced.read more
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References
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Journal ArticleDOI
The role of active oxygen in the response of plants to water deficit and desiccation.
TL;DR: During normally-encountered degrees of water deficit the capacity of the antioxidant systems and their ability to respond to increased active oxygen generation may be sufficient to prevent overt expression of damage.
Journal ArticleDOI
Adaptations to Environmental Stresses.
TL;DR: Investigating plants under stress can learn about the plasticity of metabolic pathways and the limits to their functioning, and questions of an ecological and evolutionary nature need investigation.
Book
Introduction to ecological biochemistry
TL;DR: The Plant and Its Biochemical Adaptation to the Environment, and Higher Plant-Lower Plant Interactions: Phytoalexins and Phytotoxins.
Journal ArticleDOI
An RNA-Dependent RNA Polymerase Gene in Arabidopsis Is Required for Posttranscriptional Gene Silencing Mediated by a Transgene but Not by a Virus
TL;DR: It is proposed that the role of SDE1 is to synthesize a double-stranded RNA initiator of posttranscriptional gene silencing, according to this idea, when a virus induces posttranscriptal genesilencing, the virus-encoded RNA polymerase would produce the double-Stranded RNA and Sde1 would be redundant.
Journal ArticleDOI
Effects of Water Deficits on Carbon Assimilation
TL;DR: It is now established that the rate of C02 assimilation in the leaves is depressed at moderate water deficits, mostly as a consequence of stomatal closure, and carbon assimilation may diminish to values close to zero without any significant decline in mesophyll photosynthetic capacity.