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Grain Yield and Protein Relationships in a Wheat Cross¹

The relationships between grain yield and protein content were examined in segregating populations from a cross between a locally-adapted high-yielding, low protein wheat cv. ‘Olympic’ (Triticum aestivum L.) and a lower-yielding high protein cv. ‘Kenya B.’

Segregation for grain protein content in the F₃ was continuous with no dominance. In the F₄ and F₅,, it was again continuous but there was partial dominance for low grain protein. Yield segregation in the F₄ and F₅ was continuous with partial dominance for low yield.

Grain yield and protein content in the F₄ and F₅ populations of the cross Olympic x Kenya B were found to be negatively correlated [r = -0.13 NS for the F₄ and r = - 0.58 (P < 0.01) for the F₅]. While low protein and high yield were significantly associated in the F₅ it would appear that there were no strong genetic limitations to improvement in protein percentage of the cv. Olympic at its present level of yield.

Key Words: Inheritance • Correlation • Triticum aestivum L.

² Senior lecturer in plant breeding and genetics.

Received for publication November 9, 1979.