Figure 1From: Mitochondrial genome sequencing helps show the evolutionary mechanism of mitochondrial genome formation in BrassicaCytogenetic relationships of six cultivated Brassica species as depicted by U's triangle [20]. U's triangle illustrates the evolutionary relationship between three cultivated elementary species (B. rapa, B. oleracea, and B. nigra) and three amphiploid species (B. napus, B. juncea, and B. carinata). Chromosome numbers, nuclear genome types and mitotypes are shown inside or outside the circle for each species.Back to article page