Abstract
A study of stornata development in internodes fixed with glutaraldehyde and osmium tetroxide revealed the following features: (1) young subsidiary and guard cells have proplastids, but in the mature stomatal apparatus only guard cells have starch‐containing plastids; (2) cytoplasmic continuities found in the developing stomatal apparatus included (a) plasmodesmata between young guard and subsidiary cells and (b) pores at each end of the guard cells in the wall common to these two cells (the pores are found in immature as well as mature stornata); (3) a locus of microtubules was found just inside the plasmalemma of the wall common to the two guard cells. These microtubules are generally parallel to the radial axis of this wall. They are concentrated at the site where localized wall thickening and aperture formation occur. After wall thickening begins around the developing aperture, microtubules are found running primarily in a plane perpendicular to the wall thickening. The possible functional significance of these microtubules and the cytoplasmic continuities in the stomatal apparatus is discussed.
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