|
KMID : 0381920100400020109
|
|
Korean Journal of Microscopy
2010 Volume.40 No. 2 p.109 ~ p.116
|
|
|
Morphological Study of the Suction Trap in Aquatic Utricularia japonica
|
|
Kim In-Sun
|
|
|
Abstract
|
|
|
|
Morphology and microstructure of the suction trap in aquatic Utricularia japonica were examined using scanning electron microscopy. Branched stems bear numerous suction traps without root formation. The traps are derived axillary from the node, and their antennae and appendages extend in a peculiar fashion. The trap walls are thin, two-celled, parenchyma tissue and simple, small glands are scattered in both internal and external surface of the trap. The entrance of the trap is surrounded by one pair of dorsal antennae and ventral appendages, where the former guides the prey to the entrance. Trap door is situated below the entrance and numerous sessile and stalked capitate trichomes cover the entrance and even on the door surface. The capitate trichomes are secretory, but four trigger hairs formed on the central areas of the door are not. They are believed to function in activating and tripping the trap door. A specialized region of the threshold come in contact with the lower portion of the door upon closing. The secretory capitate trichomes near this region are responsible for producing and secreting a mucilage-like substance which composes the velum. Two-armed bifid glands are located in the interior side of the threshold, while four-armed quadrifid glands are considerably numerous occurring over the entire inner trap wall. Bifid and quadrifid glands develop semi-spherical basal cells that connect them to the inner wall surface. Antennae, trigger hairs, capitate trichomes, bifid and quadrifid glands are more important structures in the carnivory of U. japonica.
|
|
|
KEYWORD
|
|
|
Aquatic, Microstructure, Morphology, Suction trap, Utricularia japonica
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|
|