Mitochondrial polymorphism. IV. Phospholipid composition of mitochondria of a wheat hybrid and its parents

Mitochondria of young seedlings of wheat genotypes 28, 31MS, and 31MS |MX 28 differed in total lipid and phospholipid. Hybrid mitochondria had more lipid and phospholipid than did the parents, and the three genotypes differed in fatty acid composition of the phospholipid fraction. Hybrid mitochondria exhibited heterosis in cytochrome oxidase activity. Although depletion of phospholipid greatly reduced cytochrome oxidase activity in hybrid mitochondria, the heterotic property was preserved. Regulatory aspects of lipid and phospholipid in mitochondria of the hybrid and complementing parental mixture are considered.