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Photosynthesis-Transpiration Compromise

By Plant Physiology-Group 4: Ria Duncan, Sherraine Cunningham, Antonia Maya Price, Darius Edwards & Paige Cudjoe

Maya Price

on 11 July 2013

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Transcript of Photosynthesis-Transpiration Compromise

Photosynthesis-Transpiration Compromise Literature Review
How does this compromise work??
Stomata Evolution: ( J. Jarvis, T. A. Mansfield and W.J. Davies, 1999)
Journal: Stomatal behaviour, photosynthesis and transpiration under rising COs shows the general role of the stomata to photosynthesis.

Stomata is regulated by feedback mechanism of biochemical and physiological stimuli
The stomata requiring the functionality of all leaves on the whole plant in a varying environment
Stomata is determinant on both external environmental conditions and internal plant factors

Structural features such as: photosynthetic capacity, stomatal spacing, dimension, and maximum aperture

Methods: Brazilian Sugarcane
• 28 different sugarcane genotypes with different growth stage were evaluated.

• The photosynthesis, stomatal conductance and transpiration was measured with a portable infrared gas analyser (IRGA- ADC, model LCi, Hoddesdon, UK).

•The leaf water potential was measured using the same leaf blade that the gas-exchange measurements were taken from with a pressure pump .

• The data were analyzed by regressions adjusted by the program Table CurveTM of AISN Software.

Method: Eucalptus saligna
Twelve Eucalyptus saligna seedlings were planted in April 2007 and grown for 2 years in 12 (10 m high) whole-tree chambers

They were planted 45 cm above the soil surface, on a installed floor surfaces. They were well watered to limit variables.

The WTCs tracked external air, temperature and humidity . Six maintained the outside conditions, and six had elevated conditions.

Gaseous exchange was measured on both leaf and Tree Scale basis.

These measurements were done at mid-morning when maximum stomatal conductance was expected.
Results/Discussion: Tomato
Transpiration is a major internal factor that affects photosynthesis.

The overall theme of the articles confirmed that there is indeed a compromising relationship between Photosynthesis and Transpiration, and that their rates are reliant several external and internal factors.

As plant chauvinists, understanding the physiological necessity for plant to photosynthesize efficiently for human food resource in agronomics and oxygen production for aerobic life respiration are relevant reasons for studying, investigating and exploring the photosynthesis-transpiration compromise.

What is this Photosynthesis-Transpiration compromise???
They are related Through the stomata found on leaves. They open to allow carbon dioxide to come in. However simultaneously water diffuses out.

What’s the problem? Water has the tendency to diffuse out of the plant is greater than carbon dioxide to diffuse into the plant leaves

Compensating ability of the plant’s stomata to strike a balance between transpiration-water loss and photosynthesis-carbon dioxide gain.

Methods: Tomato
• Light (PAR), temperature, relative humidity and ambient CO2 concentrations were measured at a canopy level of 30cm above ground between tomato plants in Jan- Feb 2001
• Photosynthesis and transpiration of tomato plants in the greenhouse were measured with a portable automated porometer type CIRAS-1 and a Parkinson Leaf chamber type PLC
• The fifth youngest, fully expanded leaves of five tomato plants were chosen for the physiological measurements
• The diurnal gas exchange of the tomato plants was measured under the natural sunlight and inherent CO2 concentration in the greenhouse.
Methods: Woody & Herbaceous Plants
Fully expanded leaves of woody species. were used, while just the middle layer of herbaceous leaves at the flowering stage was used in experiments.

A GFS 3000 high precision portable gas measuring system was used to measure the photosynthetic CO2 exchange and leaf transpiration under optimal photosynthesis conditions.

Chlorophyll content was measured spectrophotometrically

The undetached leaves were placed into a clip chamber with an artificial light source at constant temperature and humidity, and measured for 25-35 minutes.

Results/Discussion: Brazilian Sugarcane
Figure 3 shows the pattern of H2O/CO2 gas exchange after the detachment of leaves from the shoot

Graph 3

Figure 2 shows the pattern of respiration gas exchange.
Figure 2 (a, b) shows the pattern in woody plants
Figure 2 (c,d) shows the pattern in herbaceous plants
GRAPH 3: The directly proportional relationship between photosynthesis and transpiration
was due to limitation of gas exchange by the stomatal conductance of the leaf.

P. Yu. Voronin and G. P. Fedoseeva

Stomatal Control of Photosynthesis in Detached Leaves of Woody and Herbaceous Plants

Brazilian Sugarcane

Lauricio Endres, Jose Vierra Silva, Vilma Marques Ferreira

Photosynthesis and Water Relations in Brazilian Sugarcane


Michael M. Blanke and I. I Tartachnyk

Photosynthesis and transpiration of tomato and CO2 fluxes in a greenhouse under changing environmental conditions in winter

Eucalyptus saligna

Craig V.M Barton, Belina E. Medlyn, David S. Ellsworth et al.

Effects of elevated atmospheric [CO2] on istantaneous transpiration efficiency at leaf and canopy scales in Eucalyptus saligna

Group 4:
Paige Cudjoe
Antonia Maya Price
Ria Duncan
Darius Edwards
Sherraine Cunningham
Stomatal behaviour, photosynthesis and
transpiration under rising CO2
1. Barton C.V.M, Duursma R. A, Medlyn B E, Ellsworth D.S, Eamus D, Tissue D.T, Adams et. al. 2012. Effects of elevated atmospheric [CO2] on instantaneous transpiration efficiency at leaf and canopy scales in Eucalyptus saligna.
2. Endres L, Silva J.V, Ferreira V.M, De Souza Barbosa G.V. 2010. Photosynthesis and Water Relations in Brazilian Sugarcane. The Open Agriculture Journal .
3. Jarvis A, Mansfield T, Davies W. 1999. Stomatal behaviour, photosynthesis and transpiration under rising CO2. Plant, Cell and Environment
4. Saupe S. 2009. Gas Exchange/Transpiration [Internet]. Collegeville (MN): College of St. Benedict/ St. John's University;
5. Tartachnyk I, Blanke M. 2007. Photosynthesis and transpiration of tomato and CO2 fluxes in a greenhouse under changing environmental conditions in winter.
6. Voronin P, Fedoseeva G. 2012. Stomatal control of photosynthesis in detached leaves of woody and herbaceous plants.
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