Genetic Approaches to Enhance Multiple Stress Tolerance in Maize

Area of Science:

• Plant Science
• Genetics
• Agronomy

Background:

• Multiple-stress impacts on plant physiology and gene expression are increasingly studied.
• Maize research focuses on double and triple stress responses, including drought, heat, and pest infestations.

Purpose of the Study:

• To review current strategies for enhancing multiple-stress tolerance in maize.
• To highlight the roles of natural variation, molecular breeding, and genetic engineering.

Main Methods:

• Quantitative Trait Loci (QTL) identification through molecular breeding and Genome-Wide Association Studies (GWAS).
• Development of transgenic maize varieties with enhanced resistance to multiple stressors.
• Application of gene-editing techniques like base and prime editing.

Main Results:

• QTLs for multiple-stress tolerance are being identified for future breeding programs.
• Commercial transgenic maize varieties exhibit resistance to combinations of stresses (e.g., drought, insects, weeds).

Conclusions:

• Genetic approaches, including breeding and engineering, are crucial for developing stress-resilient maize.
• Gene editing and haploid induction technologies are expected to accelerate the pyramiding of stress-tolerant alleles in elite maize lines.