1. THE DISCOVERY OF ETHYLENE - THE GASEOUS HORMONE
Ethylene was first discovered around 1901 by Neljubov in Russia in relation to the “triple response” of pea seedlings.
In 1910 Cousins showed that “emanations” from oranges caused premature ripening of bananas.
In 1934, R. Gane showed that ethylene was produced by ripening apples.

2. CONTROL ETHYLENE
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3. EFFECT OF ETHYLENE ON FRUIT RIPENING
CONTROL
ETHYLENE

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6. Changes during the ripening of apples.
Ethylene promotes ripening and is produced during ripening.
Ethylene is autocatalytic
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7. The respiratory climacteric of bananas is associated with a spike of ethylene production.
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8. GUS LOCALIZATION OF ACC OXIDASE IN TOMATO FRUIT (Tissue Print Technique)

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10. EFFECT OF SILVER THIOSULFATE ON CARNATION SENESCENCE
Endogenous ethylene activity not inhibited
Ag+ blocks endogenous ethylene action
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11. ETHYLENE STIMULATES ROOT HAIR FORMATION
CONTROL
ETHYLENE
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12. ETHYLENE-INDUCED LEAF EPINASTY - TOMATO
CONTROL
ETHYLENE
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15. CHANGES IN MICROTUBULE ANGLE IN RESPONSE TO WOUNDING (ETHYLENE) IN PEA STEM
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16. EFFECT OF ETHYLENE ON LEAF ABSCISSION
CONTROL
ETHYLENE (from apple)

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20. TRIPLE RESPONSE IN ARABIDOPSIS
Hypocotyl hook maintenance
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21. Screen for the etr1 mutant of Arabidopsis
ethylene
etr1 mutant
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22. Five Related Ethylene Receptor Proteins 1
Five Related Ethylene Receptor Proteins 1.Similar to the two component system histidine kinases of bacteria. 2. Located on the ER, not the plasma membrane
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23. Unbound ethylene receptors act to block the ethylene response pathway.
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27. Screen for Arabidopsis Mutants with a Constitutive Ethylene Response
air
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ctr mutant

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