The effect of the Triticum timopheevi nucleo-cytoplasmic system on the performance of an F₁ hybrid wheat

Abstract

Hybrid performance may be affected by the T. timopheevi nucleo-cytoplasmic system for producing hybrid wheat. Its effects were investigated in three experiments which compared the same hybrid genotype produced either in T. aestivum cytoplasm or in T. timopheevi cytoplasm. Few consistent differences were found between the two hybrids. The only significant difference in grain yield was associated with a significantly reduced seed set in the T. timopheevi hybrid, and suggested a likely effect of location on the degree of fertility restoration achieved. The T. timopheevi nucleo-cytoplasmic system appeared to reduce plant stand and test weight, but to improve flour colour and flour protein content relative to the T. aestivum hybrid.