Cytokinins; Biosynthesis and Metabolism, Physiological Effects, Cross Talk

Introduction

• Ethylene (C₂H₄) is a gaseous hydrocarbon molecule which is the first reported gaseous plant hormone that serves as a signal molecule.
• Responses to ethylene in plants can be either harmful or desirable depending on its concentration, stage of plant/tissue development, and the plant species.
• In 1896, Dimitry Neljubow from the University of Sant Petersburg (Russia) identified ethylene as the active component in the illuminating gas which…

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Physiological Effects: Cross Talk

Physiological Effects

Ethylene influences plant processes such as seed germination, growth, diageotropism, senescence, flowering, abscission, fruit ripening, abiotic and biotic stress responses.

Seed Dormancy and Germination

• Seeds that fail to germinate under normal conditions (water, oxygen, temperature suitable for growth) are said to be dormant.
• Ethylene has the ability to break dormancy and initiate germination in certain seeds, such as cereals…

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