Integrating Phenotypic and Genotypic Approaches to Select Rust- and Common Bunt-Resistant Advanced Winter Wheat...

Area of Science:

• Plant Pathology
• Agricultural Science
• Genetics

Background:

• Wheat productivity is significantly reduced by rust diseases and common bunt, particularly under favorable pathogen conditions.
• Limited use of resistant cultivars exacerbates yield losses in major wheat-growing regions.
• Developing wheat cultivars with combined resistance genes is a crucial strategy for mitigating crop losses.

Purpose of the Study:

• To evaluate advanced winter wheat breeding lines for resistance to yellow rust, leaf rust, and common bunt.
• To identify wheat lines carrying specific rust and common bunt resistance genes using molecular markers.
• To select promising lines for developing wheat cultivars with enhanced disease resistance.

Main Methods:

• Phenotypic evaluation of 156 winter wheat breeding lines under artificial infection for resistance to yellow rust, leaf rust, and common bunt.
• Molecular screening using DNA markers to detect known resistance genes (Yr, Lr, Bt).
• Integrated analysis of phenotypic and molecular data to identify resistant lines and associated alleles.

Main Results:

• Fourteen wheat lines showed resistance to common bunt, and five lines exhibited resistance to yellow rust.
• Molecular markers confirmed the presence of specific resistance alleles in the evaluated lines.
• One line (9909) demonstrated high resistance to both rust diseases and common bunt.

Conclusions:

• Selected advanced breeding lines possess valuable resistance genes and phenotypic resistance.
• These lines are promising candidates for developing new wheat cultivars with improved disease resistance.
• The findings support sustainable wheat production by enhancing genetic resistance to prevalent diseases.