Translocation of Photosynthate (Photoassimilate) No Known Pumping Organ Two Separate Conducting...
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Translocation of Photosynthate (Photoassimilate)
No Known Pumping Organ
Two Separate Conducting Tissues:
Xylem
Phloem
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Translocation of Photosynthate
Two Separate Conducting Tissues:
Xylem
tracheids
vessel elements
Phloem - photosynthate (photoassimilate)
sieve tube elements
companion cells (nucleus)
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Dicot
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Stem X-Section -Herbaceous Dicot
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Phloem Tissue
Parenchyma
fibers
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Phloem
Cytoplasmic connections
P-Proteins (slime)
Callus Plugs (carbohydrate)
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Seive Plate - Callose Plugs
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Phloem Sap - Sugars * Sucrose C12H22O11
Glucose - some Lilies, Liliaceae
Mannitol & Sorbitol (sugar alcohols) - Rosaceae
Raffinose, Stachyose, Verbascose -Cucubitaceae
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Chemical Interconversions
PCR Cycle – 1st hexose phosphate = fructose-6-phosphate
phosphoglucomutase
F-6-P G-6-P ------------------------------ G-1-P
G-1-P starting pt. for synthesis of sucrose, starch, cellulose
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Chemical Interconversions
G-1-P starting pt. for synthesis of sucrose, starch, cellulose
UTP + G-1-P UDPG (uridine diglucophosphate) + P P
UDPG + F-6-P G-F-6-P (sucrose-6-phosphate)
G-F-6-P G-F (sucrose) + P
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Carbon AllocationStarch (storage) Sugars (translocation)
Sugarbeets and Sugarcane - store sucrose
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Chemical Interconversion
Starch Synthesis: glucose polymer – amylose 1-4 linkages Alpha amylopectin 1-4 and 1-6 Beta linkages
Build Up
ATP + G-1-P ADPG (adenosine diphosphoglucose) + P
ADGP + glucose G-G… + ADP
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Chemical Interconversion
Starch Synthesis:
Break Down G-G-G… + P G-P
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Chemical Interconversions
Cellulose
Most abundant carbohydrate on earth (cell walls)
Formed like starch (glucose donor is a different nucleotide sugar- GDPG)
Beta linkages between all glucose units
Seldom broken down in nature Microrganisms - cellulase
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Phloem Sap - Non-Sugars Phytohormones -
Amino Acids (Glutamic and Aspartic Acids) & Other Organic Acids
Minerals - Anions (Phosphate, Sulfate, Chloride, etc.) & Cations (Potassium)
?
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Aphids Use Stylus to Extract Phloem Sap
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Carbon Distribution
Source --> Sink
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Sinks Under Varying CO2 Levels
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Munch Pressure-Flow HypothesisE. Munch 1930
A Mechanism for Moving Phloem Sap from Source to Sink within the Plant
1. Sugars (solute) accumulate in leaves and other photosynthetic organs. SOURCE
2. Sugars are pumped into phloem of photosynthetic organ by active transport. LOADING
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Munch Pressure-Flow HypothesisE. Munch 1930
A Mechanism for Moving Phloem Sap from Source to Sink within the Plant
1. Sugars (solute) accumulate in leaves and other photosynthetic organs. SOURCE
2. Sugars are pumped into phloem of photosynthetic organ by active transport. LOADING
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Phloem Loading
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Munch Pressure-Flow HypothesisE. Munch 1930
A Mechanism for Moving Phloem Sap from Source to Sink within the Plant
1. Sugars (solute) accumulate in leaves and other photosynthetic organs. SOURCE
2. Sugars are pumped into phloem of photosynthetic organ by active transport. LOADING
3. Loading of phloem causes phloem sap to take on water by osmosis. HYDROSTATIC PRESSURE
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Munch Pressure-Flow HypothesisE. Munch 1930
A Mechanism for Moving Phloem Sap from Source to Sink within the Plant
1. Sugars (solutes) accumulate in leaves and other photosynthetic organs. SOURCE
2. Sugars are pumped into phloem of photosynthetic organ by active transport. LOADING
3. Loading of phloem causes phloem sap to take on water by osmosis. HYDROSTATIC PRESSURE
4. The Phloem sap is pushed through the seive tube column to a SINK area of low solute concentration. (root, bud, grain, bulb, etc.) Sap is pulled out by active transport or stored as starch. UNLOADING
5. Sap continues to flow toward the sink as long as sugars (solutes) do not accumulate in the phloem.
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Phloem Unloading
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Munch Pressure Flow Hypothesis is supported by the evidence.
Known rates of movement 100cm/hr., squash 290 cm/hr.
Living cells are necessary (active transport)
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Direction of Phloem Sap Movement(Radioactive Feeding Techniques)
Distribution of Photosynthate
Sap moves in both directions (up & down) - in separate phloem ducts.
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Direction of Phloem Sap Movement(Radioactive Feeding Techniques)
Distribution of Photosynthate
Sap moves in both directions (up & down) - in separate phloem ducts.
Very little tangential movement on maturre stem. Growth is decreased on defoliated side. Feed radioactive CO2 to one side - very little
radioactive photosynthate shows up on other side.
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Direction of Phloem Sap Movement(Radioactive Feeding Techniques)
Distribution of Photosynthate
Sap moves in both directions (up & down) - in separate phloem ducts.
Very little tangential movement on maturre stem. Growth is decreased on defoliated side. Feed radioactive CO2 to one side - very little
radioactive photosynthate shows up on other side.
More tangential movement among young leaves.
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Between Phloem and Xylem
Some exchange - mostly to remove mineral from senescent leaves (source to sink).
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Factors Affecting the Translocation of Sap
Temperature Increased temperature – increased loading & unloading
optimum 20 - 30 degrees C
Chilling Sensitive Plants (most)
Chilling Tolerant Plants (beets) Can acclimate translocation of photosynthate to increasingly
cold conditions
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Factors Affecting the Translocation of Sap
Light
In the dark root translocation of photosynthate is favored over stem translocation.
At least one study shows that the translocation of sap in the stem was increased by BLUE and RED light.
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Factors Affecting the Translocation of Sap
Hormones Both cell division (cytokinins) and cell elongation (auxins)
creates sinks – absorbs sap.
Bud break Increased G A, decreased ABA
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Development of Tissues of Transport and Translocation
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Development of Tissues of Transport and Translocation
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Development of Tissues of Transport and Translocation
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Development of Tissues of Transport and Translocation
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Consequences of Ambient Conditions on Tree Growth Rings
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Dormant Woody Stem
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Cellular Respiration
Oxidation of Organic Molecules - production of ATP Intermediates (carbon skeletons) produced
Aerobic: C6H12O6 --> Pyruvate (C6) + O2 --> CO2 + H2O + ATPs
Anaerobic: C6H12O6 --> Pyruvate (C6) --> Ethanol (C2)+ CO2
+ ATPs
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Cellular Respiration - 3 Stages
1. Glycolysis - Ebden Myerhoff Parnas Pathway (in the cytosol; no O2 required) Glucose - ATP C6H12O6 --------------> Glucose-6-Phosphate -->
-----------------------> Fructose-6-Phosphate (C6) ----> - ATP ------------------------> Fructose-1,6-Diphosphate (C6) -->
Dihydroxyacetone <--> Phosphoglyceraldehyde (C3) Phosphate (C3) ----->
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Glycolysis - EMPP (Anaerobic)
2 ATPs Used
4 ATPs Gained + 2 NADH2s
Pyruvic Acid (C3)
intermediates
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Fate of Pyruvate
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If Aerobic:
1. Pyruvate (C3) is further broken down in the KREBS CITRIC ACID CYCLE (in mitochondrion)
2. NADH2s are used to build ATPs in the ELECTRON TRANSPORT CHAIN (ETC)
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Krebs Citric Acid Cycle
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Krebs Citric Acid Cycle
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Electron Transport Chain
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Energy Budget
Glycolysis: 2 ATPs net gain from 1 glucose Anaerobic
Krebs Cycle & ETC: 36 ATPs net gain from 1 glucose
Aerobic: 38 ATPs
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Cyanide Resistant RespirationMany plants have been discovered to have a branch point in the ETC.
After Coenzyme Q - Only 1 ATP produced - H2O2 produced
+ More heat produced + in plant tissues. + Fruit ripening + Rids excess NADH2. Krebs Cycle continues to produce intermediates.
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Cyanide Resistant RespirationMany plants have been discovered to have a branch point in the ETC.
After Coenzyme Q - Only 1 ATP produced - H2O2 produced
+ More heat produced + in plant tissues. + Fruit ripening + Rids excess NADH2. Krebs Cycle continues to produce intermediates.
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Oxidative Pentose Phosphate Pathway
NADPH2 for PCR Cycle and Biosyntheses
Biosynthesis of Nucleic Acids, RuBP
Up to 20% of Glucose may use OPPP rather than Glycolysis.
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Lipid Catabolism - Glycolate Cycle
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Respiratory Rate and Age
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Photosynthesis and Respiration
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