Acta Botanica Croatica, Vol. 40 No. 1, 1981.
Original scientific paper
Investigations of Stomata of Three Oak Species with Light and Scanning Electron Microscope
Tomislav Bačić
; Hrvatska
Abstract
The stomata structure of Quercus robur, Q. frainetto and Q. cerris was investigated by light and scanning electron microscope. With regard to the arrangement of adjacent cells the stomata of oaks belong to the anomocytic type, and with regard to the structure of guard cells to the “gantelegubovidnyj” (= hantel-lippenformig) type described by Aneli (1975).
It is a characteristic of the guard cells of oaks that its central part has a thick wall and the end parts have thin walls similar to the stomata of Poaceae. Although the central wall is thick, its dorsal wall is slightly thinner so that the central part can also be extended when the turgor increases.
On the outer wall of the guard cells there is a thickening which protrudes above the surface of the central part of the stoma so that it can reduce the ventilation above the aperture. The existence of cuticular lamellae on the ventral walls of the guard cells seems to be a xeromorphic property.
The stomata of Q. robur and Q. frainetto are covered with wax efflorescences, and those of Q. cerris are without them. The thickenings on the outer wall of the stomata are higher in Q. robur than in Q. frainetto.
Keywords
Hrčak ID:
158430
URI
Publication date:
31.12.1981.
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