pyrabactin's role in drought tolerance
DESCRIPTION
Potential of pyrabactin as an ABA agonist in improving drought tolerance of crop plantsTRANSCRIPT
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GROUP 1Subo, Ma. Phoebe T.
Velo, Jasmine C.
Penaflorida, Megan A.
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POTENTIAL OF PYRABACTIN AS AN
ABA AGONIST IN IMPROVINGDROUGHT TOLERANCE OF CROP
PLANTS.
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RESPONSE MECHANISMS
OF PLANTS TO DROUGHTSTRESS
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Role of Abscisic Acid (ABA )
Closure of stomata
Protecting cells from drought
Root growth
Bud dormancy
Seed maturation
Abscission
Seedling growth
Apical dominance
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Synthetic form of ABA
Costly
Difficult to synthesize
Relatively unstable under field conditions
AffordableStable
Environmentally friendly
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THESIS:
SPRAYING PYRABACTIN ON CROP
PLANTS CAN ENHANCE STRESS
TOLERANCE DURING DROUGHTSAND CAN THUS IMPROVE CROP
YIELDS.
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ROLE OF PYRABACTIN AS
SEED GERMINATION ANDHYPOCOTYL GROWTH
INHIBITOR
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PYRABACTIN
A synthetic plant growth inhibitor
that acts as a seed-selective
abscisic acid (ABA) agonist.
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PYRABACTIN MIMICS THEABA
PATHWAY
Binds to PYL/PYR proteins (except PYL
2 and PYL 4)
Inhibits expression of genes for
gibberellic acid (responsible for seed
germination)
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ROLE OF PYRABACTIN IN
STOMATAL CLOSURE
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THE MECHANISM OF STOMATAL
CLOSURE:
ABA binds to receptors at the surface of the plasma membrane of theguard cells.
The receptors activate several interconnecting pathways whichconverge to produce a rise in pH in the cytosol;
transfer of Ca2+from the vacuole to the cytosol.
These changes stimulate the loss of negatively-charged ions (anions), especially NO3
and Cl,from the cell and also
the loss of K+from the cell.
The loss of these solutes in the cytosol reduces the osmotic pressureof the cell and thus turgor.
The stomata close.
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Figure 1.1 Concentrations ofABA, pyrabactin, and apyrabactin required for maximum
stomatal closure (Puli and Raghavendra, 2011)
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The ABA-induced mechanism of stomatal closure
causes a rise in the guard cells cytoplasmic levels of
pH
Reactive oxygen species (ROS)
Nitric oxide
Pyrabactin-induced stomatal closure issimilar with that of ABA.
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The actions of ABA and pyrabactin are
additive.
Figure 1.2 Additive effect ofABA and pyrabactin during stomatal closure (Puli andRaghavendra, 2011)
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ADVANTAGES OF USING PYRABACTIN(VERSUS SYNTHETIC ABA)
Relatively inexpensive
Easier to make
Insensitive to light
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CONCLUSIONS
Pyrabactin can be used as a potential
chemical than can be sprayed to plants
crops to improve their drought-tolerance.
Pyrabactin is more efficient than
synthetic ABA.
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SIGNIFICANCE
Because of pyrabactinscost-efficiency, it can
help farmers improve and increase their cropyields.
Pyrabactin could be used in studying signal
transduction in guard cells and other plant
tissues.