plant secondary metabolism in altered gravity
TRANSCRIPT
By
Fahad ShafiqPhD Scholar / Research Associate
Department of Botany,GC University Faisalabad, Pakistan
How do Plants Sense Gravity?
Cell Level
Root Level
Stem Level
Answer
Motion of a Falling or Sedimenting Body.
Mechanisms of Gravity Sensing
Amyloplasts
Statoliths
Statocytes
Hypotheses
Starch-Statolith Hypothesis
Tensegrity Model
Gravity Sensing in Columella Cells
Gravity sensing in Arabidopsis
Dynamics of Amyloplasts and AFs in Wild Type and fiz1/+ Endodermal Cells.
Linear actin cable and amyloplast. The arrow indicates an amyloplast that has moved a long distance along a linear actin cable.
Otoliths in Fishes
Why these experiments are required?
Space Colonization
International Space Station
Antioxidant Rich Food for astronauts
BLSS
Technical Limitations
Difficult to achieve gravity levels
Atmospheric conditions
Maintenance of experimental conditions
International Space Station
Vegetable Production Units
How does the gravity environment shape/alter the way plants grow and reproduce?
Directs Root & Stem Growth
Requires Gravity Perception
Gravity Studies involves
Micro gravity
Hyper-gravity
Effects on Secondary Metabolism
Increased isoflavonoids in soy bean 6-day exposure to micro gravity.
β -carotene, neoxanthin, violaxanthin, and lutein in aquatic plant Ceratophyllum (9-d)
75 % more glucosinolate in Brassicarappa.
EVIDENCES OF ALTERED SECONDARY METABOLISM
Increased disease susceptibility in wheat
soybean seedlings
Incomplete reproductive cycles
Altered gaseous exchange
Reduced seed size
Hormonal Imbalance
Reduced cytokinin due to altered fluid dynamics.
Increased effects of auxin in rice.
Altered secondary metabolism
Mechanical Stress Effects
Micro gravity
Wood formation
Secondary xylem
Lignin formation
Hyper Gravity
Shoot length
Upright growth
Cell wall extensibility
Microgravity and Hyper-gravity Effects on Secondary Metabolism in
Plants and Liquid Cultures.
Conclusions
Micro gravity
Increased secondary compound accumulation,
Decreased PAL activity
Decreased Lignin production.
Hyper gravity
Reduced secondary compound accumulation,
Increased PAL activity
Increased Lignin production
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