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Dr' Stuart Reichler

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... det3 and gca2: mutants that fail to close stomata following treatment ... Stomata aperture in response to Ca spikes: More spikes ... for stomata closing ... – PowerPoint PPT presentation

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Title: Dr' Stuart Reichler


1
  • Dr. Stuart Reichler
  • Lectures posted on class website
  • No class W 11/22

2
Signal transduction step by step Response
such as changes in cellular components or
production of new cellular components
3
Transduction can involve activation or
inactivation of proteins.
4
Cellular responses may involve changes in the
expression of genes.
5
Why so many steps?
6
Multiple steps allow for signal amplification
7
Multiple steps allow for signal specificity.
Different relay molecules lead to different
responses
8
Calcium is a common effector. Cytoplasmic
calcium levels are normally low.
9
During signal transduction, calcium can be
released into the cytoplasm Perception
10
During signal transduction, calcium can be
released into the cytoplasm Transduction
11
During signal transduction, calcium can be
released into the cytoplasm Response
12
During signal transduction, calcium can be
released into the cytoplasm
13
General model of Ca signaling
14
General model of Ca signaling
15
Plant Responses involving changes in cytoplasmic
Ca
Tbl 1. Scrase-Field and Knight, Current Opinion
in Plant Biology 2003, 6500506
16
How can calcium be involved in so many different
responses? How can changes in calcium give rise
to specificity?
Tbl 1. Scrase-Field and Knight, Current Opinion
in Plant Biology 2003, 6500506
17
2 hypotheses about how Ca signals are
transduced Signatures vs. Switches
Fig 1. Scrase-Field and Knight, Current Opinion
in Plant Biology 2003, 6500506
18
Photosynthesis Plants can make sugar using
energy from the sun, water from the ground, and
CO2 from the air.
19
Stomata regulate gas exchange CO2 in, O2 and
water out
H2O
H2O
20
Stomata
closed
open
21
Opening and closing of stomata
22
Ca fluxes in guard cells in response to hormone
or stress that cause stomatal closing. Wildtype
vs. det3 and gca2 mutants that fail to close
stomata following treatment
Fig 5. Sanders et al., The Plant Cell, S401S417,
Supplement 2002
23
Stomata aperture in response to Ca spikes More
spikes more closing
Fig 1. Allen et al., Nature, Vol 4111053-1057,
28 June 2001
24
Spike timing is critical for response
Fig 2. Allen et al., Nature, Vol 4111053-1057,
28 June 2001
25
Duration of spikes for stomata closing
Fig 2. Allen et al., Nature, Vol 4111053-1057,
28 June 2001
26
2 hypotheses about how Ca signals are
transduced Signatures vs. Switches
Fig 1. Scrase-Field and Knight, Current Opinion
in Plant Biology 2003, 6500506
27
  • Dr. Stuart Reichler
  • Lectures posted on class website
  • No class W 11/22
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