Chlorosis is a deficiency disease in plants that lead to pale or yellow coloration of leaves due to the deficiency of certain elements. Low chlorophyll synthesis due to this deficiency causes pale or yellow colouration.
Etiolation refers to the characteristic growth of green plants in the absence of light. Chlorosis occurs in etiolation also therefore etiolation can also be defined as chlorosis along with typical growth pattern shown by green plants caused by lack of light.
Chlorosis vs Etiolation
Chlorosis
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Etiolation
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It is a physiological disease.
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It is a physiological phenomenon.
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It is caused due to deficiency of certain elements like Mg2+,
iron, nitrogen, potassium, manganese, sulphur etc., when the plants are
grown in light.
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It is caused in green plants, when they are grown in dark. Mineral
deficiency is not involved in such plants.
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During chlorosis, the leaves become non green due to low chlorophyll
synthesis. Accessory pigments like xanthophylls,
carotenoids may form but cannot carryout photosynthesis due to the lack of
chlorophyll
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During etiolation, the stem becomes long and weak, the leaves become smaller
and colourless or yellow, young leaves remain unexpanded. Pigments like
chlorophylls, carotenoids and xanthophylls involved in photosynthesis are not
synthesized.
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It may be complete or inter veinal chlorosis. In inter veinal
chlorosis, petiole and veins may remain green
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Absence of light is the only factor in etiolation and the entire leaf
becomes yellow or colourless.
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Affected plant cannot carryout photosynthesis and may die due to the
lack of chlorophyll. Chlorosis can be treated
by supplying the deficient element through any method.
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Etiolation can be avoided if the plant is kept in proper sunlight. The
process is called de Etiolation.
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