Abstract
Water deficiency compromises plant performance and yield in many habitats and in agriculture. In addition to survival of the acute drought stress period which depends on plant-genotype-specific characteristics, stress intensity and duration, also the speed and efficiency of recovery determine plant performance. Drought-induced deregulation of metabolism enhances generation of reactive oxygen species (ROS) and reactive nitrogen species (RNS) which in turn affect the redox regulatory state of the cell. Strong correlative and analytical evidence assigns a major role in drought tolerance to the redox regulatory and antioxidant system. This review compiles current knowledge on the response and function of superoxide, hydrogen peroxide and nitric oxide under drought stress in various species and drought stress regimes. The meta-analysis of reported changes in transcript and protein amounts, and activities of components of the antioxidant and redox network support the tentative conclusion that drought tolerance is more tightly linked to up-regulated ascorbate-dependent antioxidant activity than to the response of the thiol-redox regulatory network. The significance of the antioxidant system in surviving severe phases of dehydration is further supported by the strong antioxidant system usually encountered in resurrection plants.
Highlights
During their ontogenesis, plants face a dynamically changing environment defined by abiotic factors and biotic interactions [1]
The Nitric oxide (NO) amount in aleurone layers drops by 75% after 24 h of osmotic stress compared to controls (20% polyethylene glycol (PEG)-6000)
Drought tolerance depends on conditional activation of the acclimation program during initial phases of water loss
Summary
Plants face a dynamically changing environment defined by abiotic factors (e.g., light/dark, temperature, nutrient and water availability, and toxic compounds such as heavy metals) and biotic interactions (e.g., beneficial and pathogenic microbes, fungi, insects, other herbivores) [1]. Is important during acute drought apparent tolerance seems be a function the antioxidant capacity realized stress, but contradiction, interferes drought with recovery from watertolimitation and of resurrection from dehydration. In the beginning of the review we will recall the classification of drought and how drought stress conditions are experimentally induced This is important information to relate the production of ROS. Our review centers on the sites of production and conditions are experimentally induced This is important information to relate the production of ROS roles of ROS and RNS during dehydration and their detoxification by the antioxidant system. Section describes the role of the antioxidative system in resurrection plants as an intriguing case of exceptional drought tolerance
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
