By Arooba Tariq M.Sc(Hons) PBG Stress: ‘Stress’ in plants can be defined as any external factor...
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Transcript of By Arooba Tariq M.Sc(Hons) PBG Stress: ‘Stress’ in plants can be defined as any external factor...
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Types of Stress-Environmental soil and
Physiological surface
By
Arooba Tariq
M.Sc(Hons) PBG
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Stress:
‘Stress’ in plants can be defined as any external
factor that negatively influences plant growth,
productivity, reproductive capacity or survival.
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It divided into two main categories:
Abiotic or environmental stress factors.
Biotic or biological stress factors.
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Biotic or biological stressBiotic stress would include such living
disturbances as fungi or harmful insects, e.g.,
Animal stress, insect stress, fungi stress, etc.
Fungi by rotting of heart wood, animals by
breaking and grazing, insects by
eating skeleton or leaves, etc.
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Animal Stress by grazing
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Insect stress by eating leaves
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Fungi stress by rotting
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A biotic or environmental stressA biotic stress is defined as the negative
impact of non-living factors on the
living organisms in a specific environment.
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A biotic stress factors or stressors are naturally
occurring factors such as intense sunlight or
wind that may cause harm to the plants and
animals in the area affected.
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Stresses can be studied classifying into the following different kinds:Drought stress.Water stress.Salt stress.Heat stress.Wind stress.Nutrient stress.
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Drought stress:It occurs when the available water in the soil is
reduced and atmospheric conditions cause
continuous loss of water by transpiration
or evaporation. Drought stress is seen
in almost all plants but its extent varies from
species to species and even within species
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Drought stress
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Water stress:Water stress may result in the arrest
of photosynthesis, disturbance of metabolism
and finally the death of plant. Water stress
inhibits cell enlargement more than cell
division. It reduces plant growth by affecting
various physiological and biochemical
processes.
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Water stress
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Salt stress:It includes wild plants that thrive in the
saline environments along the sea shore and
saline deserts. These plants, called halophytes,
have distinct physiological and anatomical
adaptations to counter the hazards of
water deficit. Salinity can affect any process in
the plant's life cycle.
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Salt stress
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Heat stress:Heat stress often is defined as where
temperatures are hot enough for sufficient time
that they cause irreversible damage to plant
function or development. In addition, high
temperatures can increase the rate of
reproductive development, which shortens
the time for photosynthesis to contribute to
fruit or seed production.
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Heat stress
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Wind stress: Wind stress is visual stress incurred by wind
causes damage to seedlings, breaking branches
and even uprooting the whole plants.
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Wind stress
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Nutrient stress:Nutrient stress is one of the major stressor
causing dying back in plants. It causes due to
the shortage of nutrients in soil such as
nitrogen, phosphorus, iron, etc.
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Nutrient stress
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Difference between biotic and abiotic stress:
Abiotic damage often occurs on many plant species.
Drought stress will likely cause damage on several
types of plants in a yard or garden. In contrast,
Biotic disease problems are more limited to a certain
species. The fungi that cause tomato leaf blight do
not cause damage on sweet corn.
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Abiotic damage does not spread from plant to plant
over time. Biotic diseases can spread throughout one
plant and also may spread to neighboring plants of the
same species. Wind-blown rain is a common way for
disease agents to spread from plant to plant.
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Biotic diseases sometimes show physical
evidence (signs) of the pathogen.
Abiotic diseases do not show the presence of
disease signs.
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