Question

explain briefly on cytokinins​

Answer 1

☞ AnSwer :-

➠ CYTOKININS :-

• Cytokinins have specific effects on cytokinesis, and were discovered as kinetin (a modified form of adenine, a purine) from the autoclaved herring sperm DNA.
• Kinetin does not occur naturally in plants.
• Search for natural substances with cytokinin-like activities led to the isolation of zeatin from corn-kernels and coconut milk.
• Since the discovery of zeatin, several naturally occurring cytokinins, and some synthetic compounds with cell division promoting activity, have been identified.
• It helps to produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious shoot formation.
• Cytokinins help overcome the apical dominance.
• They promote nutrient mobilisation which helps in the delay of leaf senescence.

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➠ MoRe to know........

• One key role of cytokinin is to regulate cell proliferation by influencing cell division
• In the shoot, cytokinins promote cell proliferation, including the activity of apical and axillary meristems

Answer 2

$\huge\underline\red{Answer}$

☆Cytokinins are essential plant hormones.

☆Cytokinins were discovered by F. Skoog, C. Miller and co-workers during the 1950s as factors that promote cell division .

☆These hormones have been found in all complex plants as well as mosses, fungi, and bacteria.

☆Cytokinins are a group of hormones that promote cell division in plant roots and shoots and the growth of buds.

☆There are about 200 different natural and synthetic cytokinins known to botanists today.

☆The most common form of naturally occurring cytokinin in plants today is called zeatin.

$\huge\underline\red{Additional -Information}$

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.