Plasmolysis in Rhoeo discolor Leaf Epidermal Cells Exposed to a Hypertonic NaCl Solution

Abstract

This study was conducted to observe the plasmolysis process in Rhoeo discolor (Adam Hawa) leaf epidermal cells after exposure to a hypertonic sodium chloride (NaCl) solution. The study also aimed to demonstrate osmosis and plasmolysis through direct microscopic observation as a practical laboratory learning activity. The experiment focused on identifying visible changes in cell structure caused by osmotic pressure differences between the inside and outside of the cell. A qualitative descriptive method was used through direct microscopic observation before and after treatment with a 10% NaCl solution. Observations were carried out using 4× and 10× objective magnifications, with sufficient time allowed for visible treatment-related changes to develop. Before treatment, the cells appeared turgid, with the plasma membrane remaining closely attached to the cell wall and the purple pigment evenly distributed. After adding the NaCl solution, clear plasmolysis was observed. The cytoplasm gradually shrank inward, and spaces formed between the plasma membrane and the cell wall due to water leaving the cell through osmosis. The observations show that hypertonic solutions can reduce turgor pressure and trigger plasmolysis in plant cells. This experiment also helped explain the concept of osmosis more clearly through direct visual observation. In addition, the study highlights the importance of osmotic balance in biological processes such as plant water regulation, wilting, and food preservation.