Plant Hormones/Phytohormones · 2020. 9. 16. · Plant Hormones/Phytohormones These are chemical...
Transcript of Plant Hormones/Phytohormones · 2020. 9. 16. · Plant Hormones/Phytohormones These are chemical...
Plant Hormones/PhytohormonesThese are chemical compounds which are released by s�mulated cells in plants and are responsible for the control and coordina�on in plants
Types of Plant Hormones
Auxins* When plants detect light, auxins are synthesized in the shoot �ps and diffuse towards the shaded region and help the cells to grow long.* Auxin s�mulates the cells to grow longer on the side of the shoot which is away from light, thus the plant bends towards the light.
Gibberellins* Work in the presence of auxin hormone.* Promote cell enlargement and differen�a�on. They also promote fruit growth, elonga�on of shoots and in breaking the dormancy in seeds and buds.
Cytokinins* They promote cell division in plants. They also promote the opening of the stomata and delay ageing in leaves.
Abscisic Acid* It promotes dormancy of seeds & buds, closing of stomata, wil�ng and falling of leaves and detachment of fruit and flower from the plant.* This hormone inhibits the growth of a plant.
Auxin molecules Cell elonga�on
Cytokinins = More Mitosis
Stoma Open
More Mitosis = More Cells
More Cells = Plant Growth