Stress Ecology
WS 06/07
Ralf Schulz
Combined chilling and (high) light stress - Tropical bean
6 h at 6 °C
3 h at 5.5 °C
2000 µmol m-2 s-1
varying light int.
Factors and resources - Temperature
70 µmol m-2 s-1
constant 2000 µmol m-2 s-1
Schulze et al 2002
Different importance/effects of heavy metals on plants
Factors and resources - Heavy metals
Schulze et al 2002
Factors and ressources
• Physico-chemical factors
Temperature, pH, Salinity, Mechanical stress, Toxic compounds
• Resource-related aspects
Light, Nutrients (C, N, P), Water, Oxygen, Organisms (as food),
Space
• Ecology-related aspects
Predation, Density (Competition), Parasitism
Lecture content
• Introduction
Overview 
Definition of stress (ecology) 
• Factors and resources (and associated reactions)
Factors 
Resources
• More complex reactions
Life cycle strategies (Ecological traits)
Predation and disturbance in communities
Abundance (and ist variation)
Anthropogenic impact on abundance (harvesting and killing)
• Seminar on stress ecology
Factors and resources (and associated reactions)
Resources - Oxygen deficiency
Resources - Oxygen deficiency
Factors and resources - Oxygen deficiency
Schulze et al 2002
Redox potential of a loamy soil
Factors and resources - Oxygen deficiency
Schulze et al 2002
Sequence of soil-bound redox reactions
Factors and resources - Oxygen deficiency
Schulze et al 2002
Root growth and redox potential - Spartania patens
Factors and resources - Oxygen deficiency
Schulze et al 2002
Germination of seeds in air or nitrogen
Lettuce
Rice
Factors and resources - Oxygen deficiency
Schulze et al 2002
Lipid degradation in rhizome tissue - Iris vs. Acorus
Factors and resources - Oxygen deficiency
Schulze et al 2002
Anatomical-morphological reactions to hypoxia - Rumex
R. acetoselia
Flooding-sensitive
R. palustris
Flooding-tolerant
Factors and resources - Oxygen deficiency
Schulze et al 2002
Factors and resources (and associated reactions)
Resources - Water deficiency
Dessication of plant cell upon exposure to air
Factors and resources - Water deficiency
Schulze et al 2002
Water storage in leaves of Peperomia
Factors and resources - Water deficiency
Schulze et al 2002
Cellular reaction to drought: ABA-mediated response
Factors and resources - Water deficiency
Schulze et al 2002
Responses of plant cells to drought
Factors and resources - Water deficiency
Schulze et al 2002
ABA-independent gene activation by drought
Factors and resources - Water deficiency
Schulze et al 2002
Response to drought - Accumulation of osmolytes
Factors and resources - Water deficiency
Schulze et al 2002
Accumulation of osmolytes - GM tobacco
Factors and resources - Water deficiency
Schulze et al 2002
CAM (Crassulacean Acid Metabolism)
Factors and resources - Water deficiency
Schulze et al 2002
Efficiencies of plants with different metabolisms
Factors and resources - Water deficiency
Schulze et al 2002
See you next week!