THE DISCOVERY OF ETHYLENE - THE GASEOUS HORMONE

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Presentation transcript:

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.

CONTROL ETHYLENE PP2205A.jpg

EFFECT OF ETHYLENE ON FRUIT RIPENING CONTROL ETHYLENE

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Changes during the ripening of apples. Ethylene promotes ripening and is produced during ripening. Ethylene is autocatalytic PP22020.jpg

The respiratory climacteric of bananas is associated with a spike of ethylene production. PP22040.jpg

GUS LOCALIZATION OF ACC OXIDASE IN TOMATO FRUIT (Tissue Print Technique)

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EFFECT OF SILVER THIOSULFATE ON CARNATION SENESCENCE Endogenous ethylene activity not inhibited Ag+ blocks endogenous ethylene action PP2205C.jpg

ETHYLENE STIMULATES ROOT HAIR FORMATION CONTROL ETHYLENE PP2205D1.jpg

ETHYLENE-INDUCED LEAF EPINASTY - TOMATO CONTROL ETHYLENE PP2205B.jpg

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CHANGES IN MICROTUBULE ANGLE IN RESPONSE TO WOUNDING (ETHYLENE) IN PEA STEM PP2208.jpg

EFFECT OF ETHYLENE ON LEAF ABSCISSION CONTROL ETHYLENE (from apple)

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TRIPLE RESPONSE IN ARABIDOPSIS Hypocotyl hook maintenance PP2207.jpg

Screen for the etr1 mutant of Arabidopsis ethylene etr1 mutant PP2212.jpg

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 PP22130.jpg

Unbound ethylene receptors act to block the ethylene response pathway. PP22142.jpg

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Screen for Arabidopsis Mutants with a Constitutive Ethylene Response air PP2215.jpg ctr mutant

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