Question

write short note on cytokinin​

Answer 1

★ Cytokinins:-

→ Discovery:- F. Skoog and co-workers observed that from the intermodal segments of tobacco stems the callus proliferated only if the nutrients medium was supplemented with extracts of vascular tissues, yeast extract, coconut milk or DNA.

→ Skoog & Miller later identified and crystallized the active substance and termed as kinetin.

→ Cytokinins were discovered as kinetin the autoclaved herring sperm DNA.

→ Kinetin does not occur naturally in plants.

→ Zeatin (from corn-kernels and coconut milk) is the natural substances with cytokinin like activities.

→ There are some synthetic compounds with cell division promoting activity.

→ Natural cytokinins are synthesized in regions where rapid cell division occurs in root apices, developing shoot, buds, fruits ect.

Answer 2

write short note on cytokinin.A hormones that cause increased cell division by stimulating the process of mitosis.

1. Development of fruits & seeds.
2. Stimulating cell division.
3. Affecting apical dominance.
4. Regulate shoot meristem size.
5. Leaf primordia number.