Plant Stress

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Plant Stress

• Plant stress is defined as any change in
  environmental conditions that produce a less than
  ideal plant response.
• Biotic
• Abiotic

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Biotic Factors

• microorganisms (bacteria and fungal)
• virus
• parasitic plants
• insects

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Abiotic Factors

• Water
• Temperature
• Light
• Soil
• Nutrients

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Water

• Drought lack of water
• Excess flood situation creating an anaerobic
  environment where roots are unable to respire due
  to lack of available oxygen.
• Plant/water relations are influenced by
  atmospheric conditions (evapotranspiration) and
  will influence drought, cold, and salt stress.

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Temperature Light

• Extremely high temperatures
• Extremely low temperatures
• Extreme temperature changes.

• Photosynthesis
• Accumulation of certain Pigments
• responsible for preventing photo-oxidation from
  UV light.

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Soil

• Salt Stress
• For most plants, the presence of high salt
  concentrations in the soil is an important stress
  factor.
• Sodium chloride (NaCl)
• is ambiguously found in nature ?
• deserts, coastal areas.
• Irrigation water contains dissolved salts that
  are conc. as the water evaporates and builds up
  in soils over time.

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Nutrient Deficiency

• A lack of one or more essential elements needed
  by plants for optimum growth lead to plant
  stress.

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Other Factors

• Chemical Injury
• Mechanical Injury
• Transplant Shock.
• Chemical Injury
• Mechanical Injury
• Transplant Shock.

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High temperature Stress
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Phosphorus deficiency
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SULFUR DEFICIENCY
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NITROGEN DEFICIENCY
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Objectives

• Go around campus and record 3 plants that show
  stress symptoms.
• Use a digital camera to take pictures (optional)
• Where was the plant located at?
• Identify the plant.
• What are some of the symptoms you see?
• What is the possible cause for each symptom?