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Electron microscopic observations of stomata, epicuticular waxes, and papillae in Chamaecyparis obtusa: Reconsidering the traditional concept of Y-shaped white stomatal bands.
Microscopy Research and Technique 2018 July
The foliar morphological characters of hinoki (Chamaecyparis obtusa) were revisited using optical and scanning electron microscopy. In C. obtusa, typical Y-shaped white stomatal bands were evident on the abaxial leaf surfaces. Two facial leaves and two lateral leaves were observed at the same node. Waxy papillae and oval stomata were arranged in two or three rows with protuberant rims on the abaxial leaf surfaces. Higher magnifications revealed the deposition of epicuticular waxes (tubules) on the Y-shaped white stomatal bands. Given the absence of stomatal bands after dewaxing with organic solvents, the white stomatal bands in C. obtusa were related to the epicuticular waxes rather than the presence of aggregated stomata alone. In contrast to C. obtusa, a single median leaf and two lateral leaves were observed at the same node of oriental arborvitae (Platycladus koraiensis). Neither stomatal bands nor papillae were observed on P. koraiensis leaves. The stomatal density and epicuticular waxes in the stomatal regions of C. obtusa were higher than those of P. koraiensis. This study suggests that the traditional concept of Y-shaped white stomatal bands in C. obtusa should be revised to describe the arrangement of the aggregated waxy stomata that occur in rows.
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