It has increasingly become evident that the plant cell wall not only provides a structural scaffold to support plant bodies but also plays crucial roles in regulation of a number of intracellular activities. Based on recent findings obtained in an aquatic monocot Vallisneria gigantea, a possible occurrence of structural and/or functional homologues of focal contact in plant cells, the site of animal cells for signal transduction from the exterior as well as for cell-substrate adhesion, is discussed.