Plant Adaptations. Outline: Photosynthesis and respiration Environmental controls on photosynthesis Plant adaptations to: High and low light Water limitation Nutrient availability Readings: Chapter 6. Conditions and Resources.
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Photosynthesis and respiration
Environmental controls on photosynthesis
Plant adaptations to:
High and low light
Readings: Chapter 6
Conversion of carbon dioxide into simple sugars
6CO2 + 12H2O C6H12O6 + 6O2 + 6H2O
Photosynthetically Active Radiation, PAR
C6H12O6 + 6O2 6CO2 + 6H2O + ATP
Net photosynthesis = Photosynthesis - Respiration
Photosynthesis involves gas exchange
More deeply lobed --> More rapid heat loss
atmosphere < leaf <root<soil
w = p ++m
p= = hydrostatic pressure
= = osmotic pressure
m= = matric pressure
% of grasses that are C4
Maximum growth rate of a plant reflects N availability in its natural habitat. A. stolonifera occurs on more nitrogen-rich soils than A. canina.
Saguaro cacti (S.W. United States) store large amounts of water; they can tolerate short periods of freezing temperatures