Do all plant tissues have the same rate of photosynthesis?

The degree of stomatal openings in plant leaves is influenced by how turgid (rigid) the plants guard cells are. When a plant is subjected to substancial light, ions are pumped into the guard cells. The more ions (hence light) means the larger the stoma will open. When the stoma is opened, water and nutrients from the plants roots (osmosis) travel up the plants xylem and is lost through evaporation at the stoma. this is called transiration. the larger the stomatal opening, the higher the transpiration (water travelling) rate. the stoma opens for photosynthesis (intake of CO2) and at the same time water is lost. to save water the stoma does not open at night when there is no sunlight for photosynthesis. So to answer the question, transpiration rate in plants will increase when subjected to higher light intensities and slow when there is no light.