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Breeding Methodology in Wheat. II. Productivity, Harvest Index, and Height Measured on F₂ Spaced Plants for Yield Selection in Spring Wheat¹

Three crosses of spring wheat (Triticum aestivum L.) involving the cultivar ‘Glenlea’ as a common female parent were used to evaluate the use of productivity, harvest index, and height in a combined index selection procedure on F₂ spaced-plants as selection criteria to identify high-yielding F₄ bulks. A space-planted and solid-seeded trial of seven tall cultivars and seven semi-dwarf cultivars (both groups including the parents involved in the crosses investigated), indicated that potentially high-yielding tall cultivars could be selected from space-planted populations using productivity. Semi-dwarf cultivars (short cultivars), in contrast, could be selected from space-planted populations using harvest index. Therefore, productivity was used as the selection criterion on tall F₂ plants and harvest index was used as the selection criterion on short F₂ plants for high yield potential. The results indicated that a combined index selection procedure utilizing productivity, harvest index, and height may be useful in increasing yield in spring wheat.

Key Words: Triticum aestivum L. • Early generation selection

² Graduate student and professor, Dep. of Plant Science, Univ. of Manitoba, Winnipeg, Manitoba R3T 2N2.

Received for publication October 9, 1979.

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