võtmerakud

Võtmerakud, also known as "key cells" in English, are a specific type of cell found in the stamens of certain plants, particularly in the family Ranunculaceae. These cells are characterized by their enlarged size and thickened cell walls, often with a lignified structure. They are typically found in the basal part of the filament, the stalk that supports the anther.

The primary function of võtmerakud is believed to be related to the dehiscence of the anther, the process by which the pollen is released. Their thickened walls may provide mechanical support during anther development and maturation. As the anther dries, these cells can undergo changes in turgor pressure, leading to differential shrinkage and expansion that aids in splitting the anther wall and exposing the pollen. This mechanism ensures efficient pollen dispersal for successful plant reproduction.

The presence and structure of võtmerakud can vary between different species within the Ranunculaceae family, making them a feature that can be used in plant identification and taxonomic studies. Their specialized morphology highlights the intricate adaptations plants have evolved for reproductive success. The study of these cells contributes to a broader understanding of plant anatomy and reproductive biology.