It is a group including, newly emerged plant hormones with some identified functions like:- - Growth stimulant of parasitic plants, - Plant architecture determinant, - Arbuscular mycorrhiza symbiosis promoter, - Other developmental and environmental cues. - Despite of their immense developmental potential, the strigolactone research in the last few years has established their significance in adverse environmental conditions including under DROUGHT, SALINITY, NUTRIENT STARVATION, TEMPERATURE, and PATHOGENIC ASSAIL, etc.

1. Strigolactones
Dr. Purushottam Lal
Assistant Professor in Botany
Govt. College, Dholpur 328001
bansiwal.purush@gmail.com

3. रुखरी (Roonkhari):
Striga angustifolia
Family: Orobanchaceae

5. होली का मामा (Holi-ka-Mama):
Cistanche tubulosa
Family: Orobanchaceae

7. मरगोजा (Margoja):
Orobanche cernua
Family: Orobanchaceae

8. Parasitic Plants
commonly observable
from different parts of Rajasthan

9. Plants are so powerful, but have to face Limitations -
- Due to their sessile habit plants have to grow with lesser escape options
during episodes of various environmental fluctuations.
- Surviving is the second ultimate goal of life and it also ensures a probable
chance to reproduce.
- To survive well under adverse conditions, plants have developed efficient
SENSING, SIGNALING, and RESPONSE mechanisms including the role of
different phytohormones in the management of hostile ecological situations.

10. Diversity among Phyto-hormones
- The plant hormones traditionally have been classified into growth promoting
(AUXIN, GIBBERELLINS, CYTOKININS) or inhibiting (ETHYLENE &
ABSCISIC ACID) categories, thus particularly focused on development.
- The plant hormones have also been addressed for
their role under stress conditions and the significance of
phytohormones like ABSCISIC ACID (ABA), ETHYLENE (ET), SALICYLIC ACID (SA),
& JASMONIC ACID (JA)

11. What are Strigolactones ?
• It is a group including, newly emerged plant hormones with some identified functions like:-
- Growth stimulant of parasitic plants,
- Plant architecture determinant,
- Arbuscular mycorrhiza symbiosis promoter,
- Other developmental and environmental cues.
- Despite of their immense developmental potential, the strigolactone research in the last few
years has established their significance in adverse environmental conditions including under
DROUGHT, SALINITY, NUTRIENT STARVATION, TEMPERATURE, and PATHOGENIC
ASSAIL, etc.
- Research prospects includes better manage the crop loss under hostile ecological
conditions.

12. Proven Roles of Strigolactones

13. Chemical Overview
SLs
Strigol Family
Orobancol Family
C2'-(R) stereochemistry via the
enol-ether bridge that
connects the C and D rings
• SLs were first isolated in 1966 from cotton roots.
• Later studies proved that SLs are necessary for
seed germination in parasitic plants like Striga
species in germination of parasitic plants, in trace
amounts (5 ppm).

14. Striga species (Orobanchaceae)
Striga asiatica
Striga angustifolia
Orobanche cernua

15. Biosynthesis

16. Receptor
Changes in the
architecture and
dynamics of actin
filaments and PIN
endocytosis, which is
important for PIN2
polarization.
As a result, PIN2 protein
polarization is affected,
which may lead to
changes in auxin flux
and execution of
strigolactone-associated
root effects, such as root
hair elongation
Signalling Pathway
PIN2
Polarization

17. - Despite of their immense developmental potential, the
Strigolactone research in the last few years has established their
significance in adverse environmental conditions including under
- DROUGHT,
- SALINITY,
- NUTRIENT
- STARVATION,
- TEMPERATURE, and
- PATHOGENIC ASSAIL, etc.
- Research prospects includes
better manage the crop loss under hostile ecological
conditions.

18. Thank you…