NDLI: New insights explain that drought stress enhances the quality of spice and medicinal plants: potential applications

Content Provider	Springer Nature Link
Author	Kleinwächter, Maik Selmar, Dirk
Copyright Year	2014
Abstract	Drought stress is generally considered as a negative factor in agriculture, being responsible for severe yield losses. However, medicinal plants grown under semi-arid conditions usually produce higher concentrations of active substances than same species grown under moderate climates. Currently, only limited information is available on the physiological background of this well-known phenomenon. To elucidate this issue, we review here the existing findings to unveil the underlying metabolic mechanisms. Indeed, we found that the drought stress-related metabolic changes are responsible for the accumulation of active substances in semi-arid regions. In particular, the biochemical coherences are as follows: due to limited water supply and much higher light intensities, the plants suffer from drought stress. Then, due to water shortage, stomata are closed and the uptake of CO$_{2}$ decreases markedly. As a result, CO$_{2}$ fixation via Calvin cycle decreases. This decline of CO$_{2}$ fixation leads to a massive decrease in the consumption of reduction equivalents (NADPH + H$^{+}$), generating in turn a massive oversupply of NADPH + H$^{+}$. As a consequence, metabolic processes are pushed towards the synthesis of highly reduced compounds, such as isoprenoids, phenols, or alkaloids. Our findings open the path to design practical approaches for enhancing the product quality of spice and medicinal plants. Indeed, by deliberately applying moderate drought stress during their cultivation, the quality of spice and medicinal plants can be enhanced significantly.
Starting Page	121
Ending Page	131
Page Count	11
File Format	PDF
ISSN	17740746
Journal	Agronomy for Sustainable Development
Volume Number	35
Issue Number	1
e-ISSN	17730155
Language	English
Publisher	Springer Paris
Publisher Date	2014-11-21
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Paris
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Drought stress metabolites Over-reduced state Surplus of energy Medicinal plants Agriculture Soil Science & Conservation Sustainable Development
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Agronomy and Crop Science

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