The seminar discusses senescence and regulation in plants. Senescence is the final stage of development for plants, where nutrients are recycled from leaves and stored for future growth or seeds. Regulation of protein synthesis plays a key role in determining cell proliferation and senescence. There are different types of senescence like overall, top, deciduous, and progressive senescence that affect different parts of plants. The sequence of senescence events in flowering plants includes roots, cotyledons, leaves, stems, fruits, flowers, and eventually the whole plant. Senescence processes are tightly controlled until death occurs.

1. Seminar On
“Senescence And Regulation”
Created by:
Ajinkya Yerlekar

2. Introduction
 Senescence in the plant is the final stage of development during which the plant
recycles the valuable cellular building blocks that have been deposited in the
leaves and other parts of the plant during growth.
 These reusable nutrients are then stored in the plant until they can be used in
new growth or sent to the seed to provide a nutrient store for the next
generation.
 Regulation of protein synthesis is increasingly being recognized as an important
determinant of cell proliferation and senescence. In particular, recent evidence
indicates that eukaryotic translation initiation factor 5A (eIF-A) plays a pivotal role
in this determination.

4. The state of being old : the process of
becoming old.
The growth phase in a plant or plant part
(such as leaf) from fully maturity to death

5. Types of Senescence
Overall Senescence Top Senescence Deciduous
Senescence
Progressive
Senescence

6. Overall Senescence:
 Full body of the plant will
dies
e.g.
Annual plants like wheat,

7. Top Senescence:
 It is partial senescence.
 Aerial parts of plants
die(senesce)
 Underground parts remain
same
e.g.
Perennial plants like,
banana, ginger, etc.,

8. Deciduous Senescence:
 Found in temperate
deciduous trees
 Seasonal foliage
 Depending upon the
local stress
e.g.
Elm and maple.

9. Progressive Senescence:
 Roots, steam, and branches
remain same.
 Older leaves and lateral
organs like flower, fruits
branches exhibit
senescence.
e.g.
Pinus, etc.,

10. What is Regulation of Senescence ?
 Senesce processes are tightly controlled processes.
 the sequence of events is usually highly ordered until
the terminal stages (death) are underway.

11. Senescence of root
Senescence of cotyledons
Senescence of leaf
Senescence of stem
Life cycle of a flowering plant:

12. Senescence of fruit
Senescence of flower
Senescence of apex
Senescence of whole plant
(monocarpism)
Life cycle of a flowering plant:

13. Conclusion:
 Plant senescence is the process of aging in plants
 Its is a final stage of development
 During this stage plants recycles the cellular building blocks

14. Thank You !

15. Any Questions
Any Query

16. References:
 http://www.biologyreference.com
 http://www.preservearticles.com/2011121918520/brief-essay-on-senescence-
in-plants.html
 http://www.therubins.com/aging/proc3.htm