Table of Contents
Cytokinins
Cytokinins produce the Richmond Lang effect, it retards the aging process of plant parts keeping them productive.It delays leaf senescence.
What is Richmond Lang effect?
Richmond Lang effect is the retardation of aging due to the application of the plant regulator cytokinins. The regulator acts by retarding the rate of destruction of chlorophyll and yellowing of leaves.
Which one is the physiological role of cytokinin?
Promotion of cell division: The major physiological role of naturally occurring cytokinins is to promote cell division. In the presence of auxins, nearly all cytokinins stimulate cell division and susbsequent callus growth in the parenchymatous cellsof several plants.
Which is not function of cytokinin?
Cytokinins do not take part in fruit ripening. Ethylene hormone stimulates ripening of fruits.
What is Richmond Lang effect of cytokinin?
Answer: The effect was discovered in 1967 by Richmond & Lang. As per this effect, the lag of senescence of leaves and other parts occurs with the aid of plant growth regulator cytokinin. Retarding senescence leads to delay of chlorophyll degradation rate, the yellowing colour of the leaves and keeping it active longer.
Which hormone is responsible for aging?
Parathyroid hormone levels rise with age, which may contribute to osteoporosis. Insulin is produced by the pancreas. It helps sugar (glucose) go from the blood to the inside of cells, where it can be used for energy.
Why is ABA called stress hormones?
Abscisic acid acts as a general plant growth inhibitor and an inhibitor of plant metabolism. ABA inhibits seed germination. ABA stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses. Therefore, it is also called the stress hormone.
Which hormone is responsible for bolting effect?
Gibberellins promote the growth of dwarf peas and are involved in the bolting (elongation) of rosette plants such as the carrot.
Who discovered Phytohormones?
Kenneth V. Thimann became the first to isolate one of these phytohormones and to determine its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
How does cytokinin delay senescence?
Cytokinin production slows down the process of senescence. However, accumulation of sugars during senescence, due to the breakdown of accumulated starch or the preferential export of N2 from the leaf, can block the effect of cytokinin, especially in low light.
Which hormone was first isolated from human urine?
Auxin hormone
Auxin hormone was first isolated from human urine.
Which hormone is responsible for bolting?
Bolting is induced by plant hormones of the gibberellin family, and can occur as a result of several factors, including changes in day length, the prevalence of high temperatures at particular stages in a plant’s growth cycle, and the existence of stresses such as insufficient water or minerals.