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Inheritance of Resistance to Septoria nodorum in Wheat¹

Six wheat (Triticum aestivum Lem. Thell) parents and all possible F₁ crosses (reciprocals included) making up a diallel series were grown under greenhouse conditions and tested for glume blotch [caused by Septoria nodorum (Berk.) Berk.] reaction during the heading stage. Significant (P0.01) effects were found for general combining ability (GCA) and specific (SCA) combining ability. The wheat cultivars ‘Oasis’ and ‘Blueboy II’ had the largest GCA effects for resistance while ‘McNair 1813’ and ‘IAS-20’ had GCA effects for susceptibility. The cross ‘Holley’ x Ga H69-56A-1 had the largest SCA effect for resistance while the crosses Holley x Blueboy II and Oasis x Blueboy II had the lowest mean disease rating in the study.

Key Words: Diallel cross • Glume blotch • General combining ability • Specific combining ability • Cytoplasmic inheritance • Triticum aestivum Lem. Thell.

² Associate professor.

Received for publication September 17, 1979.