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Bits of Photsynthesis. Plant Physiology Biology UNI 2008. Plant job description. light. sugar. CO 2. O 2. H 2 O. The good stuff?. The good stuff?. CH 2 OPP. OH. HO. OH. O. O. O. OH. HO. HO. O. O. OH. CHO. COOH. HO. O. GGPP. CH 2 OPP. synthase. IPP. Phytoene.

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Bits of photsynthesis l.jpg

Bits of Photsynthesis

Plant Physiology

Biology UNI

2008


Plant job description l.jpg
Plant job description

light

sugar

CO2

O2

H2O

The good stuff?

The good stuff?


Slide3 l.jpg

CH2OPP

OH

HO

OH

O

O

O

OH

HO

HO

O

O

OH

CHO

COOH

HO

O

GGPP

CH2OPP

synthase

IPP

Phytoene

desaturase

-carotene

desaturase

-carotene

Lycopene

-carotene

cyclase

cyclase

hydroxylase

hydroxylase

Lutein

dioxygenase

Zeaxanthin

OH

ketolase

epoxidase

HO

CHO

Violaxanthin

Retinal

Astaxanthin

CH2OH

dioxygenase

Retinol

ABA

COOH

Retinoic Acid

Xanthoxin


Chlorophyll fluorescence dumps excess energy from absorbed light l.jpg
Chlorophyll fluorescence dumps excess energy from absorbed light

Blue light shined on this green tissue, red fluorescence from chlorophyll.


Photosystem geometry l.jpg
Photosystem geometry light

Light harvesting complex =Rxn center + Antenna pigs

Reaction center

e-

Antenna Pigments


Shade and sun plants l.jpg
Shade and sun plants light

Shade plant

Sun plant

Genetic control (capacity) and developmental control.

May not be able to adjust later.


Photosynthetic electron flow l.jpg
Photosynthetic electron flow light

Thylakoid membrane

ADP+ Pi

H+

ATP

NADPH

e-

e-

PS II

PS I

Coupling factor

e-

e-

O2

H+

3 H+

H+

H2O split

H2O

Cytochrome complex

Water splitting complex


The pq pump l.jpg
The PQ “pump” light

+

+

stroma

-

-

+

+

thylakoid membrane

from PS II

-

to PS I

-

-

-

PQ: plastoquinone

+

+

interior of thylakoid

Used electron power to move protons (charge battery)


Balanced photosynthesis l.jpg

Photo light

High energy compounds

Synthesis

Real time

Harvests light energy

Uses harvested energy

Balanced photosynthesis


Unbalanced photosynthesis l.jpg
Unbalanced photosynthesis light

Photo

High energy compounds

Synthesis

Real time

bright light produces lots of energy

low-capacity biochemical pathways use it slowly

Potential for destruction.


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