Cytokinins are essential plant hormones. By stimulating cell division, they regulate shoot meristem size, leaf primordia number, and leaf and shoot growth. They can stimulate both the differentiation and the outgrowth of axillary buds.
What is the main function of cytokinins?
Cytokinins are a group of plant growth regulators which are primarily involved in performing cell division in plant roots, shoot system. This hormone helps in promoting the cell’s growth, development, differentiation, affecting apical dominance and delay in leaf senescence.
What are the two functions of cytokinins?
Cytokinins are synthesized in the root apex of plants. The two functions of cytokinins include an increase in cell division and delay of senescence.
What are functions of cytokinins in plant growth?
Cytokinins promote cell division and increase cell expansion during the proliferation and expansion stages of leaf cell development, respectively. During leaf senescence, cytokinins reduce sugar accumulation, increase chlorophyll synthesis, and prolong the leaf photosynthetic period.
What is the main function performed by cytokinin class 11?
induction of cell division
Cytokinin is a hormone whose main function is induction of cell division and delay in senescence.
What is the function of cytokinin Mcq?
It is a plant hormone influencing the stimulation and growth of cell division. These are synthesized in the roots and typically are derived from adenine. They are critical in the processes of cell differentiation and normal growth, which takes place in the fruits and leaves.
What is the function of auxin and cytokinin?
The hormones auxin and cytokinin are key regulators of plant growth and development. As they are active at minute concentrations and regulate dynamic processes, cell and tissue levels of the hormones are finely controlled developmentally, diurnally, and in response to environmental variables.
What are the uses of cytokinin give examples?
Cytokinins are essential plant hormones. By stimulating cell division, they regulate shoot meristem size, leaf primordia number, and leaf and shoot growth. They can stimulate both the differentiation and the outgrowth of axillary buds. The cytokinins can mediate axillary bud release from apical dominance.
What is the mean of cytokinin?
cytokinin, any of a number of plant hormones that influence growth and the stimulation of cell division. Cytokinins are synthesized in the roots and are usually derived from adenine.
What is the chemical name of cytokinin?
The first common natural cytokinin identified was purified from immature maize kernels and named zeatin (chemical name: 6-(4- hydroxy-3-methylbut-2-enylamino)purine; Fig. 1).
What is cytokinin in plants?
Cytokinins are N6 substituted adenine derivatives that affect many aspects of plant growth and development, including cell division, shoot initiation and growth, leaf senescence, apical dominance, sink/source relationships, nutrient uptake, phyllotaxis, and vascular, gametophyte, and embryonic development, as well as
Who discovered cytokinin?
Cytokinins are a structurally diverse group of N6-substituted purine derivatives capable of inducing plant cell division. The discovery of cytokinins by Folke Skoog and colleagues in the 1950s initially focused on kinetin, a synthetic compound derived from autoclaved salmon sperm DNA (Miller et al., 1955).
Which of the following is an example of cytokinin?
Kinetin is an artificial, aromatic cytokinin and benzyladenine is an example of a naturally occurring aromatic cytokinin. Thidiazuron is a diphenylurea-type cytokinin.
Why are cytokinins named so Class 11?
Cytokinins are a class of plant growth substances that promote cell division, or cytokinesis, in plant roots and shoots.
What is the main origin of cytokinin?
Most adenine-type cytokinins are synthesized in roots. Cambium and other actively dividing tissues also synthesize cytokinins. No phenylurea cytokinins have been found in plants. Cytokinins participate in local and long-distance signalling, with the same transport mechanism as purines and nucleosides.
What is the main function of auxin?
What are the major functions? Answer: Auxin promotes cell growth and elongation of the plant. In the elongation process, auxin alters the plant wall plasticity making it easier for the plant to grow upwards.
Where is cytokinin found?
Where are cytokinins produced in plants? Cytokinins are more abundant in developing tissues and organs, such as root tip, shoot apex, cambium, and immature organs, and initially it was thought that cytokinins are synthesized in these limited tissues and organs.
Which of the following is related to cytokinin?
Coconut milk and young kernels of maize contains cytokinin. Cytokinis are a class of plant growth substances that promote cell division, or cytokinesis in plant roots and shoots.
What is the chemical nature of cytokinin?
Chemically, natural cytokinins are N6-substituted purine derivatives. Isopentenyladenine (iP), zeatin (Z), and dihydrozeatin (DZ) are the predominant cytokinins found in higher plants. The free bases and their ribosides (iPR, ZR, DZR) are thought to be the biologically active compounds.
What are the 4 functions of auxins?
Functions:
- It promotes lateral and adventitious shoot growth and used to initiate shoot growth in culture.
- Helps in overcoming apical dominance induced by auxins.
- Stimulate the formation of chloroplast in leaves.
- Promotes nutrient mobilisation and delay leaf senescence.
What is difference between cytokinin and auxin?
> Auxin stimulates root branching. > Cytokinin inhibits root branching and lateral root formation.