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SIGNAL MEDIATORS AT INDUCTION OF HEAT RESISTANCE OF WHEAT PLANTLETS BY SHORT-TERM HEATING
Ukrainian Biochemical Journal
|March 31, 2016
Summary
Calcium ions, reactive oxygen species (ROS), and nitric oxide (NO) play a crucial role in wheat
Area of Science:
- Plant Physiology
- Molecular Biology
- Biochemistry
Background:
- Plant heat resistance is vital for crop survival under changing climates.
- Cellular signaling pathways involving ions and reactive molecules are implicated in stress responses.
- Understanding the interplay of calcium, ROS, and NO is key to elucidating heat tolerance mechanisms.
Purpose of the Study:
- To investigate the functional interplay of calcium ions, reactive oxygen species (ROS), and nitric oxide (NO) in wheat root cells.
- To determine the role of these signaling molecules in inducing heat resistance via hyperthermia treatment.
- To elucidate the specific mechanisms by which calcium influences ROS and NO production during heat acclimation.
Main Methods:
- Wheat plantlets (Triticum aestivum L.) were subjected to short-term hyperthermia (42°C for 1 minute).
- Treatments included calcium antagonists (EGTA, lanthanum chloride, neomycin), enzyme inhibitors (sodium wolframate, L-NAME), antioxidants (ionol), and ROS scavengers (dimethylthiourea).
- Changes in nitric oxide (NO) and hydrogen peroxide (H2O2) content were measured, alongside the plantlets' acquired heat resistance.
Main Results:
- Heating induced a transient increase in NO and H2O2, which was suppressed by calcium antagonists.
- Hydrogen peroxide increase was partially inhibited by nitrate reductase and NO-synthase inhibitors.
- Nitric oxide increase was suppressed by antioxidant and ROS scavenger treatments, and these compounds reduced acquired heat resistance.
Conclusions:
- Calcium ions play a critical role in activating enzymatic systems that generate ROS and NO.
- A functional interplay exists between calcium, ROS, and NO in inducing heat resistance in wheat plantlets.
- These signaling mediators are essential components of the plant's acclimation response to heat stress.
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