Plant hormones are naturally occurring organic substances that affect physiological processes. There are five major groups of plant hormones, such as auxins, gibberellins, cytokinins, abscisic acid and ethylene. In this presentation describes about ethylene with its biosynthesis, transport, pathways and physiological effects.

1. Ethylene
Dr. Emasushan Minj
Assistant Professor
Department of Botany
St. Xavier’s College,
Mahuadanr, Latehar
Nilamber Pitamber University

2. Introduction
• Ethylene is a .
• It is the like abscisic acid.
• It has simplest structure.
• It is produced in all higher plants and
•

3. Biosynthesis and transport
• Ethylene is produced almost all parts of higher plants.
• for ethylene
biosynthesis.
• The rate of production also depends on the type of tissue
and the stage of development.
• Ethylene biosynthesis is such
as .
• Auxins also promote ethylene synthesis.
• from its site of
synthesis.

4. Physiological effects
• The
is termed abscission.
• It occurs at a
• Auxin has opposite effect it prevents leaf abscission by
maintaining cells.
• Ethylene induces flowering in mango and pineapple family
(Bromelliaceae).
• In monocots generally male and female flowers are separate,
ethylene may change the sex of developing flower.
• The promotion of female flower formation in cucumber is one
example of this effect.

5. • The downward curvature of leaves that occurs when
• Hence, .
• Ethylene induces
• which increases the
surface area for the absorption of water and nutrients.

6. • Fruit ripening results colour development, softening,
starch hydrolysis, sugar accumulation, production of
aroma compounds.
• The loss of green pigment causes by the
• Ethylene accelerates the processes association with
in many fleshy fruits.

7. Thankyou