wht r the functions of gibberllins , auxins, cytokinins, abscisic acid, ethylene
Auxins
When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer. When light falls on one side of the plant, the auxins generally diffuse towards the shaded side of the shoot. This stimulates the cells in the shaded area to grow longer than the corresponding cells of the illuminated region. This results in the curvature of the plant stem tip towards the light.
Gibberellins
They are produced in the roots of a plant. They promote stem elongation by promoting cell division in the inter-nodal region.
Cytokinins
They promote cell division. Therefore, they are present in greater concentration in those areas of the plants where rapid cell division occurs. For example, tip of the shoot.
Abscisic acid
It promotes seed dormancy by inhibiting cell growth. It is involved in the opening and closing of stomata. It is also responsible for the shedding of leaves.
Ethylene
It regulates fruit ripening. It is produced during the ripening of fruits.
When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer. When light falls on one side of the plant, the auxins generally diffuse towards the shaded side of the shoot. This stimulates the cells in the shaded area to grow longer than the corresponding cells of the illuminated region. This results in the curvature of the plant stem tip towards the light.
Gibberellins
They are produced in the roots of a plant. They promote stem elongation by promoting cell division in the inter-nodal region.
Cytokinins
They promote cell division. Therefore, they are present in greater concentration in those areas of the plants where rapid cell division occurs. For example, tip of the shoot.
Abscisic acid
It promotes seed dormancy by inhibiting cell growth. It is involved in the opening and closing of stomata. It is also responsible for the shedding of leaves.
Ethylene
It regulates fruit ripening. It is produced during the ripening of fruits.