Fig. 6-3

Flower shapes and structures of the most abundant sterols in the wild type and the frl1 mutant of Arabidopsi The frl1 mutant has serrated petals owing to its altered sterol composition (right). In the marginal cells of frl1 petals, the size of some nuclei is dramatically increased (lower right, white spots). The most abundant sterol in the wild-type Arabidopsis is sitosterol that is methylated at carbon 28 by SMT2 (left, red line). In the frl1 mutant, the amount of sitosterol is greatly reduced, and campesterol, which is not methylated by SMT2, has become predominant (right).

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