1 of 19

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

Presentation by

Dr. Muhammad Shafiq

March - 2025

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

1

2 of 19

Agenda

Cytokinin Overview

Historical Discovery and Types of Cytokinins

Cytokinin Synthesis and Role in Plant Growth

Importance in Agriculture

Cytokinins in Crop Management

Application Techniques

Benefits to Farmers and Challenges

Future Prospects and Conclusion

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

2

3 of 19

Cytokinin Overview

Cytokinins are plant hormones that play a vital role in cell division, growth, and various developmental processes in plants. They contribute to nutrient mobilization and delay leaf senescence.

Definition and Role

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

3

  • Discovered during studies on coconut milk and autoclaved herring sperm DNA.
  • Key Types: Zeatin, Kinetin, Benzyladenine (BA).

4 of 19

PRESENTATION TITLE

4

Cytokinin Biosynthesis

  • Synthesized in root meristems, developing embryos, and young leaves.
  • Transported via xylem to shoots and leaves.
  • Enzymes like IPT (Isopentenyl transferase) play a key role in cytokinin biosynthesis.

5 of 19

Key Functions of Cytokinins�

PRESENTATION TITLE

5

  1. Cell Division & Differentiation: Stimulates mitosis, especially in combination with auxins.
  2. Shoot and Root Development:
    1. High cytokinin-to-auxin ratio = Shoot formation.
    2. Low cytokinin-to-auxin ratio = Root formation.
  3. Delays Senescence: Retards aging by maintaining protein and chlorophyll levels.
  4. Nutrient Mobilization: Enhances movement of nutrients to active tissues.
  5. Bud Dormancy and Apical Dominance: Breaks dormancy and encourages lateral bud growth.
  6. Seed Germination: Stimulates enzymes for nutrient mobilization.

6 of 19

Discovery of cytokinin

PRESENTATION TITLE

6

Aspect

Details

Discovery Year

1955

Discoverer(s)

Folke Skoog and Carlos O. Miller

Institution

University of Wisconsin-Madison, USA

Initial Compound

Kinetin (a cytokinin derived from autoclaved herring sperm DNA)

Significance

Kinetin was the first cytokinin identified, found to promote cell division in plant tissues.

Natural Cytokinin Identified

Zeatin (discovered in corn kernels in 1961)

Key Function

Promotes cell division, shoot initiation, and delays senescence in plants.

Mode of Action

Regulates gene expression by interacting with cytokinin receptors, influencing plant growth and development.

Impact on Agriculture

Widely used in tissue culture, seed germination, and improving crop yields.

7 of 19

Historical Discovery

1955

First Identification

Friedrich Wilhelm Went discovered cytokinin in coconut milk, which promoted cell division.

Chemical Structure

The structure of zeatin, the first identified cytokinin, was determined.

Role Elucidation

Research highlighted cytokinin's role in differentiating shoots from roots in plant tissue cultures.

Commercial Use

Cytokinins were commercially synthesized for agricultural applications.

1960

1970

1980

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

7

8 of 19

Types of Cytokinins

Includes zeatin, isopentenyladenine, and adenine, naturally occurring in plants.

Natural Cytokinins

Man-made compounds like kinetin and benzyladenine, designed for enhanced stability and effectiveness.

Synthetic Cytokinins

Different classes have varying effects including promoting lateral bud growth and delaying leaf aging.

Roles in Plants

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

8

9 of 19

9

SOURCE

TYPE

PRODUCTION METHOD

Coconut Milk

Natural

Extracted from coconuts

Bacterial Cultures

Natural

Produced by bacteria in the soil

Synthetic Processes

Synthetic

Manufactured in laboratories

Plants

Natural

Produced by various plant tissues

Yeast

Natural

Extracted from yeast cells

Cytokinin Synthesis

This table summarizes the major sources and methods of cytokinin production, both natural and synthetic.

10 of 19

Role in Plant Growth

Cytokinins stimulate cell division and promote shoot formation, leading to increased biomass.

They regulate nutrient uptake and modulate flowering and fruiting processes, influencing yield.

Growth Promotion

Developmental Effects

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

10

11 of 19

Importance in Agriculture

Cytokinins significantly enhance agricultural productivity by improving growth rates, increasing resistance to stress, and optimizing crop yield.

Impact on Crop Yield

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

11

12 of 19

Current Cytokinin-Based Products in Agriculture�

PRESENTATION TITLE

12

Product Name

Active Ingredient

Application

MaxCel®

6-Benzyladenine (BA)

Increases fruit size in apples.

Fascination®

6-Benzyladenine + GA4+7

Delays senescence in ornamentals.

Promalin®

Cytokinin + Gibberellin

Enhances fruit shape in apples.

CPPU (Forchlorfenuron)

Synthetic cytokinin

Improves fruit size in grapes, kiwifruit, etc.

https://zarkhaiz.pk/product/zarbar-250ml-bio-stimulant-plant-growth-regulators-amino-acids-essential-nutrients-by-corteva/?utm_source=chatgpt.com

13 of 19

Cytokinins in Crop Management

This section examines techniques for incorporating cytokinins in agricultural practices and their benefits.

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

13

14 of 19

14

TECHNIQUE

USAGE

NOTES

Foliar Sprays

Direct plant application

Effective for rapid uptake.

Soil Applications

Root absorption

Helps in nutrient mobilization.

Tissue Culture

Laboratory propagation

Promotes shoot regeneration.

Application Techniques

This table presents various techniques for applying cytokinins in agriculture, illustrating their usage and benefits.

15 of 19

Benefits to Farmers

Farmers gain from improved crop yields, enhanced stress resistance, and better resource management, ultimately leading to more profitable harvests.

Advantages of Using Cytokinins

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

15

16 of 19

Challenges and Limitations

High costs and limited availability can hinder cytokinin use, especially for small-scale farmers.

Implementation Issues

Overuse can lead to environmental concerns, necessitating careful application practices to avoid ecological imbalance.

Environmental Considerations

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

16

17 of 19

Future Prospects

There are emerging biotechnological approaches focusing on genetically modifying crops for enhanced cytokinin production to boost agricultural resilience and productivity.

Innovations in Cytokinin Applications

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

17

18 of 19

Conclusion

Understanding cytokinin's role and applications is crucial for advancing agricultural practices and meeting the global food demand.

Summarize Key Takeaways

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

18

19 of 19

Q&A Session

An interactive session where audience members can raise queries regarding the presentation and learn more about cytokinins.

Address Audience Questions

CYTOKININ: DISCOVERY, IMPORTANCE, AND APPLICATIONS IN AGRICULTURE

19