Heritability and Number of Genes Governing Adult-Plant Resistance to Powdery Mildew in Houser and Redcoat Winter Wheats

Abstract

Heritability and number of genes controlling adult-plant resistance to powdery mildew (Blumeria graminis f. sp. tritici) was studied in three winter wheat (Triticum aestivum 1.) crosses. Parents, F 1 , F 2 , F 3 , and backcross populations were evaluated in the field under naturally occurring inoculum of powdery mildew. Number of genes controlling adult-plant resistance in Houser and Redcoat was determined by both qualitative and quantitative methods. Mildew severity was used for qualitative estimates, and area under the disease progress curve values were used to quantitative estimates. Adult-plant resistance to powdery mildew in Red coat and Houser is controlled by two to three genes [...]