chapter 7 bot3015l regulation of gas exchange of terrestrial plants l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 7 BOT3015L Regulation of Gas Exchange of Terrestrial Plants PowerPoint Presentation
Download Presentation
Chapter 7 BOT3015L Regulation of Gas Exchange of Terrestrial Plants

Loading in 2 Seconds...

play fullscreen
1 / 31

Chapter 7 BOT3015L Regulation of Gas Exchange of Terrestrial Plants - PowerPoint PPT Presentation


  • 345 Views
  • Uploaded on

Chapter 7 BOT3015L Regulation of Gas Exchange of Terrestrial Plants. Presentation created by Danielle Sherdan All photos from Raven et al. Biology of Plants except when otherwise noted. Today. Review photosynthesis and bulk transport in plants Observing leaf morphology

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 7 BOT3015L Regulation of Gas Exchange of Terrestrial Plants' - Patman


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
chapter 7 bot3015l regulation of gas exchange of terrestrial plants
Chapter 7BOT3015LRegulation of Gas Exchange of Terrestrial Plants

Presentation created by Danielle Sherdan

All photos from Raven et al.Biology of Plants except when otherwise noted

today

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
review of photosynthesis
Review of photosynthesis

Triose phosphates

Note that this is a depiction with some gaps and misrepresentations for summary purposes

transport summary
Transport Summary

A=absorption / assimilation

L=loading

U=unloading

I=interchange

today7

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
today9

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
morphological adaptations responses to water availability
Morphological AdaptationsResponses to Water Availability

Waterlily (Nymphaea)

Note the misnomer, waterlilies are not in the Liliaceae family

Note the abundant of air spaces.

This plant grows in water.

Modified from Outlaw lecture

slide11

Morphological AdaptationsResponses to Water Availability

Note large volume-to-surface area ratio ideal for dry environment

Spines (modified leaves) protect the water-filled plant body from predation

Ferocactus

slide12

Example of turgor control of quick responses in highly specialized leaves

Venus fly trap (Diaonaea)

Plants in motion

Venus fly trap

Photo by Jean Burns at Hosford bog

today14

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
three tissue systems in leaves too
Three tissue systems in leaves too

Cross-section, midvein of leaf

Cross-section, blade of leaf

Lilac (Syringa)

stomata adaptations to terrestrial environments
Stomataadaptations to terrestrial environments

Isolated epidermis stained with neutral red

(vital stain that stains compartments of living cells)

Lilac (Syringa)

today17

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
slide18

Stomata typical of monocots

Stomata typical of dicots

Potato (Solanum)

Maize (Zea)

Scanning electron microscope images

slide19

Stomata and trichome of tobacco (Nicotiana)

Scanning electron microscope image

morphological adaptations responses to water availability20
Morphological AdaptationsResponses to Water Availability

Banksia

Note sunken stomata.

. . . Sunken stomata increase the distance from the moist leaf interior to the bulk atmosphere. Flux Equation!

Modified from Outlaw lecture

slide21

Morphological AdaptationsResponses to Water Availability

Trichomes and sunken stomata

Oleander (Nerium)

today22

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
gas exchange open closed stomata

Photos from Outlaw’s lab and

also featured on the cover of the scientific

journal Archives of Biochemistry and Biophysics

Gas ExchangeOpen & Closed Stomata

Fava bean (Vicia)

Stomata animation

Modified from Outlaw lecture

gas exchange g ion transport stomatal opening

Proton extrusion makes membrane potential more negative and acidifies apoplast.

Water influx

Potassium uptake.

Thermodynamics: MP

Mechanism: MP & wall acidification activate the Kin channel

Gas Exchange (g)Ion Transport—stomatal opening

Inside cell

Membrane

Modified from Outlaw WH, Jr. Integration of cellular and physiological functions of guard cells. CRC Crit Rev Plant Sci 22: 503-529

gas exhange e stomatal swelling

A. Guard-cell symplast accumulate solutes from guard-cell apoplast.

MEMBRANE

B. Water flows into guard cells osmotically.

C. Radial micellation of cellulose microfibrils prevents increase of cell diameter.

E. Water influx increases pressure, but water is incompressible, so guard-cell volume increases. The increase results from stretching of the dorsal wall.

CELL WALL

D. Inner wall is strong and cannot be stretched.

Gas Exhange (e)Stomatal swelling

Modified from Outlaw lecture

gas exchange j ion transport stomatal closing

A. Anion efflux shifts the membrane potential to a less negative position.

Inside cell

B. Potassium efflux.

Thermodynamics: MP

Mechanism: MP activates the Kout channel

Membrane

Gas Exchange (j)Ion Transport—stomatal closing

Modified from Outlaw WH, Jr. Integration of cellular and physiological functions of guard cells. CRC Crit Rev Plant Sci 22: 503-529

gas exchange ion transport aba action

Inside cell

Membrane

Gas Exchangeion transport—ABA action

ABA may be made in roots and transported to shoots, or made by leaves, or even by guard cells.

ABA activates the anion channel, directly or by several means indirectly (e.g., via Ca2+ signaling).

ABA activates the Kout channel via cytosolic alkalinization.

Modified from Outlaw WH, Jr. Integration of cellular and physiological functions of guard cells. CRC Crit Rev Plant Sci 22: 503-529

today28

Today

  • Review photosynthesis and bulk transport in plants
  • Observing leaf morphology
  • Examples of highly modified leaves
  • Leaf anatomy
  • Stomata, adaptations to terrestrial environments
  • Stomata aperture changes
  • Further understanding of stomata by experimentation
slide29

What internal and external factors likely affect stomatal aperture?

What are the effects of CO2 on stomatal aperture?

Why do we want to know? How is this important?

About 1700 gallons of water are required to grow food for one adult in the US per day!

(From 1993 National Geographic)

experimental design
Experimental Design

The question:

What are the effects of CO2 on stomatal aperture?

How can we manipulate CO2 concentration?

One way:

CO2 + NaOH => NaHCO3 (sodium bicarbonate)

in notebook and checked before you leave
In notebook and checked before you leave
  • Drawings
  • Methods
  • Data
  • Review questions

QUIZ NEXT WEEK