Evaluation of screening techniques for heat tolerance in wheat

Area of Science:

• Agricultural Science
• Plant Physiology
• Genetics

Background:

• Wheat (Triticum aestivum L.) is a vital global crop susceptible to heat stress.
• Identifying heat-tolerant genotypes is crucial for maintaining wheat production under rising temperatures.

Purpose of the Study:

• To evaluate the efficacy of various physiological parameters in identifying heat-tolerant wheat genotypes.
• To determine the most suitable method for heat stress screening in wheat.

Main Methods:

• Four wheat genotypes were subjected to high temperatures (39°C and 35°C).
• Measurements included cell membrane thermal stability, antioxidant activity, phenolics content, Paraquat tolerance, and kernel weight.
• Repeatability of measurements and discrimination between tolerant and susceptible genotypes were assessed.

Main Results:

• Phenolic compound content increased under stress but did not differentiate genotypes.
• Membrane thermal stability, antioxidant activity, phenolics content, and Paraquat tolerance yielded inconsistent data and failed to distinguish tolerant from susceptible varieties.
• Kernel weight showed significant variation between heat-tolerant and heat-susceptible genotypes.

Conclusions:

• Kernel weight is a more effective and reliable parameter for screening heat-tolerant wheat genotypes compared to the other physiological techniques evaluated.
• This finding can aid in developing more resilient wheat varieties for challenging environments.