Characterization of Wheat Line Guan 4 Resistant to Stripe Rust and Powdery Mildew by Molecular Markers

Wheat disease is one of the main factors that affect wheat production.Breeding of disease-resistant wheat varieties is the most economical and effective method to control wheat diseases.Normally,the resistance controlled by single gene loses easily in practice.We made multiple crosses by using the wheat germplasms with different disease-resistance traits or high grain quality,and developed a new wheat line Guan 4 with strong multiple disease resistances and good agronomic characteristics.The genes for disease resistance and the quality improvement in the new line were analyzed by molecular markers.The result indicated that Guan 4 carried resistance to both stripe rust and powdery mildew,in which the powdery mildew resistance was contributed by Pm21 from parent 92R179,while the stripe rust resistance was contributed by YrX from parent YW243,and the high quality genes of HMW-GS 7+8 in the new line were derived from another parent Liaochun 10.Therefore,Guan 4 would be applied in wheat breeding as excellent parent to improve quality and resistance to stripe rust and powdery mildew of the wheat.