種々の育成状態におけるホテイアオイの組織学的研究

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This research was excuted to compare the anatomical structures of the vegetative tissues of E. crassipes grown under four different conditions ; i. e., floating, emerged, wetland and upland conditions. In the root, three different layers can be distinguished in the cortex through the cross sections. The cell walls of both outer and inner cortex of upland type changed thick compared with floating type. In the root of emerged type, it was sometimes observed that the aerenchymatic tissue between outer and inner cortex developed remarkably. In the leaf tissue, the palisade parenchyma of upland type was well developed and small vascular bundles with irregular distribution were very numerous in comparison with floating type. A very similar bundle arrangement which showed well developed mechanical tissue was found in the structure of petiole of upland type. The number of stomata on both surfaces of a leaf were more numerous on the upper side than the lower. The stomatal frequency varied in the different parts of a leaf, that was they were numerous at near margin and at near center of the lamina while very scarce at the base. Also these numbers fluctuated by the growing conditions significantly. It was occasionally recognized the presence of some degenerative stomata on the upper side of upland type. Such reduced frequency of stomata probably provides the transpiration check. From these results it seems to be concluded that in E. crassipes the structure well suited to the environment could be modified easily with the change of habitat from floating to upland.
日本雑草学会の論文
1981-12-26

種々の育成状態におけるホテイアオイの組織学的研究

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