Abstract
Summary Electrophoregrams of DNA fragments obtained after EcoRI specific cleavage of chloroplastic (cp) and mitochondrial (mt) DNAs isolated from diploid, tetraploid and hexaploid wheat species are compared. HexaploidTriticum aestivum, tetraploidsT. turgidum andT. timopheevi and diploidAegilops speltoides appear to be characterized by an identical chloroplastic genome and can be differentiated from diploidsT. monococcum andAe. squarrosa. Considering the mitochondrial genome,T. aestivum andT. turgidum are similar, butT. timopheevi, T. monococcum, Ae. squarossa andAe. speltoides present a distinct diagram each. Consequently, the B genome of wheat cannot have originated from contemporaryAe. speltoides.
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