Bud size in plants is significantly and primarily influenced by turgor pressure. Turgor pressure, the hydrostatic pressure within a plant cell, plays a crucial role in cell expansion and overall plant growth. This pressure, generated by the inward diffusion of water into the cell, pushes against the cell wall, causing it to expand. The extent of this expansion, and therefore bud size, is directly related to the magnitude of the turgor pressure.
High transpiration rates and high turgor pressure in plants are interconnected processes.