Metabolic responses to drought stress in the tissues of drought-tolerant and drought-sensitive wheat genotype seedlings

Abstract

Productivity of wheat is affected by drought stress; however, the correlation between drought stress and metabolism is still not clear. The aim of this study was to investigate physiological adaptive mechanisms and reveal physiological processes related to drought tolerance. The results indicated that the wheat metabolome is dominated by sugars, organic acids and amino acids; the wheat metabolome plays important roles in enhancing the drought tolerance of shoots. Drought caused system alterations in widespread metabolic networks involving transamination, tricarboxylic acid cycle, glycolysis, glutamate-mediated proline biosynthesis, shikimate-mediated secondary metabolisms and GABA metabolisms.

Comparative metabolomics analysis reveals different metabolic responses to drought in tolerant and susceptible poplar species

“…‘Danhong’ and P. simonii under drought conditions. These metabolites are compatible solutes, and their accumulation can decrease the osmotic potential in plants to ensure sufficient water for normal plant growth under drought conditions (Obata and Fernie , Guo et al ). They may serve as osmolytes and osmoprotectants to prevent membrane fusion and to stabilize enzymes and other cellular components in response to drought stress (Hoekstra et al , Sánchez‐Martín et al , Mata et al , Yang et al ).…”

“…In Arabidopsis thaliana , proline, erythritol and putrescine levels significantly increase only in mature leaves, and the abundance of most amino acids increases in severely desiccated leaves, but decreases in mildly desiccated leaves (Skirycz et al ). In wheat, drought stress induces the accumulation of osmolytes, which include amino acids, sugars and organic acids, as well as also alters metabolic networks affecting transamination, glycolysis, citric acid cycle (TCA‐cycle) and glutamate‐mediated proline biosynthesis (Bowne et al , Guo et al ). The metabolic profiling of oat ( Avena sativa ) reveals that the salicylic acid signaling pathway, carbon modulation, antioxidant and photo‐oxidative metabolisms are key processes that contribute to drought tolerance (Javier et al ).…”

A Proposed Drought Response Equation Added to the Münch-Horwitz Theory of Phloem Transport

“…Hans et al 1976, Bell and Leigh 1996, Geiger, 2003, on the distribution of photosynthates to various plant organs, especially roots (e.g. Hummel et al 2010, Lemoine et al 2013) and on related metabolism (Guo et al 2018). Reducing the EUC of the root sinks in a plant with more than one competitive sink, would not necessarily decrease the amount of photosynthates Unloaded into the growing roots.…”

High-throughput sequencing reveals microRNAs and their targets in response to drought stress in wheat (Triticum aestivum L.)

“…More sucrose accumulated in the tolerant cultivar under drought stress [48]. Similarly, the drought-tolerant cultivar JD17 accumulated sucrose on prolonged drought-stress [49]. Thus, sucrose levels appear to be crucial to the response of wheat to drought, and our results indicate that one response mechanism may involve regulation of sucrose synthase via NmiRNA15.…”