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BIOSCI 102 L3 (L19 (stresses (abiotic (response (sensing the stress,…
BIOSCI 102 L3
L19
phototropism
3 steps of response
signal mechanism
asymmetric cell expansion
sensor
gravitropism
statolith
at root cap cells
shoot vascular bundles
mutant lacking statolith still partly sense gravity
tropism
definition
plants organs grow towards or away from stimuli
root
shoot
example
gravitropism
thigmotropism
phototropism
chemotropism
movement
rapid, visible movement
leaf close
mimosa
nocturnal
nocturnal flower close
stomated close
venus fly trap movement
rapid turgour driven movement
osmotic pressure
water movement
K+
stresses
abiotic
response
sensing the stress
signalling within& between cells
adapt
appropriate response
biotic
applications
crop improvement
secondary metabolites
L21
definition
chemical messenger
phototropism
adventitious
receptor
signal transduction
auxin
development processes
cell differentiation
apical dominance
regulating organ patterning
fruit expansion
commercial uses
parthenocarpy
as a herbicide for dicots
inducing rooting of cuttings
definition
chemical messenger
role in cell elongation
IAA
mainly in leaf primordia & young leaves; in developing seeds
synthesis from the amino acid tryptophan
function
circulating chemical signal
transport
cell-to-cell; polar
uncover mechanism of phototropism
seedling bend towards the light
hormone
definition
circulating chemical signal
co-ordinates
various parts of the organism
in a multi-cellular organism
by
interacting with target cells
role as
chemical messengers
how stimulates cellular responses
binding to receptors
binding activated signal transduction pathways
carry a signal to various sites
response types
activating
transcription factors turn on
new sets of genes
deactivating
Pr kinases that
phosphorylate sets of enzymes