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Relationship of Dwarfing and Hybrid Wheat Mechanisms¹

The effects of dwarfing genes on the fertility of hybrid wheat (Triticum aestivum L. em Thell) were studied in 36 topcrosses. Three spring wheat cultivars with pollen fertility restorer genes for Triticum timopheevi cytoplasm were crossed with 12 near-isogenic height lines of the spring wheat cultivars ‘INIA 66’ and ‘Norteno 67.’ The 36 F_1,'s were used to pollinate a ‘Noroeste 66’ male sterile line.

The source of major dwarfing segregation used in the near-isogenic lines came from the cultivar ‘Olesen’ dwarf. Segregation for both height and restoration genes in a male-sterile cytoplasm was studied. The degree of restoration and sterility was measured by the number of seeds set in one spike/plant. Frequency distributions revealed a larger-than-expected proportion of sterile plants in the short height groups and a larger-than-expected number of fertile plants in the tall height groups. Correlation studies in seed-bearing plants showed a weak but positive relationship between plant height and fertility.

Key Words: Fertility • Cytoplasmic sterility • Restoration • Semi-dwarf • Triticum aestivum L. • Triticum timopheevi Zhuk.

² Rockefeller fellow and professor, respectively, Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523.

Received for publication December 17, 1974.