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The occurrence and distribution of myrosin cells and myrosinases has been followed in different organs during development of 7 species of the Brassicaceae. Using light and electron microscopy the myrosin cells were characterized morphologically and compared to other idioblasts in the tissue. Myrosin grains stain specifically with toluidine blue, methylene blue azur-II, lactophenol aniline blue and fuchsin. At the ultrastructural level myrosin grains were seen to contain proteins, and oleosomes occupy most of the myrosin cells at an early stage of development in young seedlings, together with precursors for mitochondria, plastids and microbodies. Changes in ultrastructure take place during development and light has a negative effect on the extent of cellular differentiation. Myrosin cells are generally found distributed in differentiated tissue, from the imbibition stage up to 192 h after germination. The relative area occupied by the myrosin cells has been calculated by morphometrical analyses an...
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Bones et al. (2013) studied this question.