Transcript Plant Stress

Plant Stress
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Plant stress is defined as any
change in environmental conditions
that produce a less than ideal plant
response.
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Biotic
Abiotic
Biotic Factors
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microorganisms (bacteria and fungal)
virus
parasitic plants
insects
Abiotic Factors
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Water
Temperature
Light
Soil
Nutrients
…
Water
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Drought – lack of water
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Excess – flood situation creating an
anaerobic environment where roots are
unable to respire due to lack of available
oxygen.
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Plant/water relations are influenced by
atmospheric conditions (evapotranspiration) and
will influence drought, cold, and salt stress.
Temperature
Light
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Extremely high
temperatures
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Photosynthesis
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Extremely low
temperatures
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Accumulation of
certain Pigments
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Extreme
temperature
changes.
responsible for
preventing photooxidation from UV
light.
Soil
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Salt Stress:
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For most plants, the presence of high salt concentrations
in the soil is an important stress factor.
Sodium chloride (NaCl):
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is ambiguously found in nature 
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deserts, coastal areas.
Irrigation water contains dissolved salts that are conc. as
the water evaporates and builds up in soils over time.
Nutrient Deficiency
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A lack of one or more essential elements needed by plants for
optimum growth lead to plant stress.
Macroelements
Element
Microelements
Symbol
Element
Symbol
Nitrogen
N
Chlorine
Cl
Phosphorous
P
Iron
Fe
Potassium
K
Boron
B
Manganese
Mn
Calcium
Ca
Zinc
Zn
Magnesium
Mg
Copper
Cu
Molybdenum
Mb
Nickel
Ni
Sulfur
S
Other Factors
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Chemical Injury
Mechanical Injury
Transplant Shock.
Chemical Injury
Mechanical Injury
Transplant Shock.
High temperature Stress
Phosphorus deficiency
SULFUR DEFICIENCY
NITROGEN DEFICIENCY
Objectives
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Go around campus and record 3 plants
that show stress symptoms.
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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?