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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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
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