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Plant bio

Physiological Ecology of photosynthesis

QuestionAnswer
Plant (photosynthetic) productivity - The optimization of CO2 assimilation per unit of water loss - Biochemical / physiological mechanisms of increasing assimilation
Changes in stomatal density - stomatal density in plants grown at varying levels of CO2 shows plants have different densities
Changes in stomatal function with leaf age - Stomatal conductance correlates well with photosynthetic rate
Stomatal complex - guard cell lumen beside epidermal cells show opening
Transpiration (diffusion) - is affected by water vapour deficit Vapour gradient leaf air space - atmosphere
Resistance to CO2 entry Mesophyll resistance: sum of wall, PM, cytoplasmic, chloroplast membrane, stromal and carboxylation Resistances - includes contribution of carbonic anhydrase
Resistance to water loss - predominantly physical Diffusion is linearly related to pore diameter at low apertures
Diffusion - dependent on air turbulence - regulated by variations in stomatal aperture - affected by: light CO2 ozone plant water status hormones (growth regulators)
Hormonal control of stomatal aperture - K+ inwards: ABA inhibits - K+ outwards: ABA stimulates
Infrared imaging - used to isolate Arabidopsis mutants defective in stomatal regulation
Stomatal responses to environmental factors - integrated ie. light intensity and CO2 concentration
Light intensity response - open in light (attenuated by CO2) - closed in dark
Light spectrum effectiveness - best in blue, then red, then green
Created by: rose.coo
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