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Resistance of Male Sterile Wheat to Ergot as Related to Pollination and Host Genotype¹

This study was undertaken to determine if susceptibility of cytoplasmically male sterile spring wheat (Triticum aestivum L. em Thell.) to ergot [Claviceps purpurea (Fr.) Tul.] is influenced by pollination and host genotype.

Inoculation at various times after hand pollination showed that resistance was established in some lines within a few hours after pollination. The development of resistance after pollination was more rapid in some lines than others, but most lines were nearly immune by 7 days after pollination. Inoculation of diallel crosses between lines that developed resistance quickly after pollination and those that developed resistance slowly indicated that the resistance factor was maternally controlled.

Key Words: Claviceps purpurea • Disease resistance • Hybrid wheat • Triticum aestivum • Cereals • Outcrossing

² Postdoctoral fellow and professor, Dep. of Plant Pathology, Montana State Univ., Bozeman, MT 59715.

Received for publication March 12, 1976.