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Lecture Outline. DefinitionsAdaptation and AcclimationTypes of Stress - Water stress. Definitions. Stress - An external factor which exerts a disadvantageous effect on the organism.OR - Any change in environmental conditions which adversely alters plant growth or developmentStra
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1. BIO2202 Plant Physiology 1Stress Physiology - Lecture 1
An Introduction to Stress
2. Lecture Outline
Definitions
Adaptation and Acclimation
Types of Stress
- Water stress
3. Definitions Stress
- An external factor which exerts a disadvantageous effect on the organism.
OR
- Any change in environmental conditions which adversely alters plant growth or development
Strain
- The reduction in plant growth or function resulting from a stress.
4. More Definitions…. Adaptation to Stress
- Genetically determined resistance acquired over generations by selection.
- Heritable modifications in structure or function which increase the fitness of the plant in a stressful environment.
5. More Definitions…. Acclimation to Stress
- An increase in the stress tolerance of an individual plant as a result of exposure to prior stress
- Non-heritable physiological modifications made during the life of the individual plant
NOTE: The capacity to acclimate is genetically determined
6. Types of Stress