Which statement about cytokinins is not true? a. They...

Which statement about cytokinins is not true? a. They promote cell division in tissue cultures. b. They delay the senescence of leaves. c. They usually promote the elongation of stems. d. They act by a receptor with protein kinase activity. $e .$ They were discovered as a breakdown product of DNA.

Which statement about cytokinins is not true?
a. They promote cell division in tissue cultures.
b. They delay the senescence of leaves.
c. They usually promote the elongation of stems.
d. They act by a receptor with protein kinase activity.
$e .$ They were discovered as a breakdown product of DNA.

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Key Concepts

Cytokinins

Cytokinins are a class of plant hormones primarily involved in promoting cell division (cytokinesis) and regulating various aspects of plant development including shoot initiation and the inhibition of leaf senescence. They help in maintaining the activity of the shoot and root meristems and are essential in tissue culture propagation techniques.

Plant Hormone Functions

Plant hormones orchestrate growth, development, and responses to environmental signals. Each class of hormone tends to have a specific set of roles; for example, while gibberellins are known for promoting stem elongation, cytokinins are chiefly involved in cell division and delaying aging in leaves.

Hormone Receptors and Signal Transduction

Cytokinins are perceived by receptors that belong to a two?component system featuring a histidine kinase domain. This system is distinct from the typical eukaryotic protein kinase activity found in many other signaling pathways, emphasizing unique mechanisms of signal perception and transmission in plants.

Stem Elongation

Stem elongation is usually a characteristic effect of gibberellins rather than cytokinins. While cytokinins influence lateral growth and cell division, they are not primarily responsible for promoting the elongation of stems, which is a key difference in the functions of various plant hormones.

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