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.
Stomatal Control of Photosynthesis in Detached Leaves of Woody and Herbaceous Plants
Lauricio Endres, Jose Vierra Silva, Vilma Marques Ferreira
Photosynthesis and Water Relations in Brazilian Sugarcane
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.
On each side of the stoma there is a guard cell with chloroplasts." title="Internal structure of a leaf" height="380" width="546" style="margin-bottom: 0px;">The internal structure of the leaf is also adapted to promote efficient photosynthesis:
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.
• 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.
• The photosynthesis, stomatal conductance and transpiration was measured with a portable infrared gas analyser (IRGA- ADC, model LCi, Hoddesdon, UK).