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Stability of Yield Performance in Triticale and Common and Durum Wheats¹

Three cultivars of common wheat (Triticum aestivum L. em. Thell.) and one each of triticale (Triticale hexaploide Lart.) and durum wheat (T. turgidum L. var. durum) were studied for their ability to yield consistently over a range of environments. This ability, as measured by the contribution of cultivars to the interaction sum of squares, was not associated with yielding ability. ‘Rosner’ triticale was less stable than ‘Hercules’ durum wheat, which in turn was less stable than ‘Manitou,’ ‘Neepawa,’ or ‘Pitic 62’ common wheat. In a second experiment with five triticale cultivars tested for 2 years over five locations, only the cultivar x location x year interaction was significant.

Key Words: Synthetic amphiploid • Genotype x environment interaction

Received for publication February 2, 1971.