Plant Leaves - physiology, Plant Leaves - growth & development, Plant Leaves - drug effects, Salinity, L, Helianthus annuus, sunflower, leaf growth, pavement cell shape, Helianthus - growth & development, Plant Epidermis - drug effects, Cell Shape - drug effects, Plant Epidermis - physiology, Plant Roots - drug effects, Helianthus - physiology, Plant Epiderm...