06 Plant Water Relation - part 13 - Structure of stomatal apparatus
06 Plant Water Relation - part 13 - Structure of stomatal apparatus Structure of stomatal apparatus : Typical stomatal apparatus consists of two guard cells - Stoma Accessory cells. 1. Stomata : Are minute, elliptical pores bounded by two kidney/ dumbbell shaped guard cells. Is a type of epidermal tissue which may be called as modified, epidermal parenchyma cell. Are kidney shaped in dicotyledons Dumbbell-shaped in grasses. In Cyperus , both kidney- and dumb bellshaped guard cells are present. Guard cells Are living, nucleated cells with unevenly thick walls. Inner wall : thick and inelastic; Lateral wall is thin and elastic. Contain few chloroplasts which are capable of poor photosynthesis. Guard cells have ability to change their size and form due to which stoma opens (widens) or closes (narrows). Stoma Is an elliptical pore formed due to specific...