Drought-adaptive attributes in the Seri/Babax hexaploid wheat population

Area of Science:

• Plant Breeding
• Agronomy
• Crop Physiology

Background:

• Wheat is vulnerable to drought, impacting global food security.
• Identifying drought-adaptive traits is crucial for developing resilient crop varieties.

Purpose of the Study:

• To assess agronomic and physiological traits for drought adaptation in wheat.
• To identify reliable selection criteria for drought-tolerant wheat genotypes.

Main Methods:

• Field trials across diverse environments (Mexico, Australia) over three years.
• Evaluation of a recombinant inbred line population (Seri/Babax) under varying water regimes.
• Statistical analysis of phenotypic and genetic correlations between traits and yield.

Main Results:

• Canopy temperature (CT) emerged as the most significant drought-adaptive trait, highly heritable and strongly correlated with yield.
• CT demonstrated consistent association with yield across latitudes and growth stages.
• Early drought response, indicated by CT, is linked to biomass, chlorophyll, and plant height, suggesting water extraction ability is key.

Conclusions:

• Canopy temperature is a valuable selection tool for breeding drought-resilient wheat.
• Water extraction from soil under deficit is a critical attribute for drought adaptation.
• Further genomic and transcriptomic studies are warranted to understand drought adaptation mechanisms.