Skip to Content


« Back to Glossary Index

– Definition of Epicotyl
– Region of seedling stem above seed leaves
– Shows hypogeal germination
– Extends stem above soil surface
– Misconception about emergence order
Epicotyl’s role in plant development

– Importance in Plant Physiology
– Embryonic shoot above cotyledons
– Development into plant leaves
Epicotyl in dicots vs. monocots
– Role of hypocotyl in dicots
– First shoot emergence in monocots

– Growth Regulation
– Length control by phytochrome photoreceptors
– Factors influencing epicotyl elongation
– Environmental impacts on growth
– Regulation mechanisms in different plant species
– Significance in plant growth studies

– See Also
– Related plant structures: Hypocotyl, Radicle, Plumule
– Interconnection of plant structures
– Comparative analysis of plant parts
– Understanding plant embryonic development
– Importance of different plant components

– External Links
– Additional resources on epicotyl
– Detailed information on plant biology
– Access to further reading materials
– Online sources for plant morphology
– Utilizing external references for research

Epicotyl (Wikipedia)

An epicotyl is important for the beginning stages of a plant's life. It is the region of a seedling stem above the stalks of the seed leaves of an embryo plant. It grows rapidly, showing hypogeal germination, and extends the stem above the soil surface. A common misconception is that the epicotyl, being closer to the apex of the plant, is the first part to emerge after germination - rather, the hypocotyl, the region of the stem between the point of attachment of the cotyledons and the root - forms a hook during hypogeal germination and pushes out of the soil, allowing the more delicate tissues of the plumules and apical meristem to avoid damage from pushing through the soil. The epicotyl will expand and form the point of attachment of the shoot apex and leaf primordia or "first true leaves". Cotyledons may remain belowground or be pushed up aboveground with the growing stem depending on the plant species in question.

In plant physiology, the epicotyl is the embryonic shoot above the cotyledons. In most plants the epicotyl will eventually develop into the leaves of the plant. In dicots, the hypocotyl is what appears to be the base stem under the spent withered cotyledons, and the shoot just above that is the epicotyl. In monocot plants, the first shoot that emerges from the ground or from the seed is the epicotyl, from which the first shoots and leaves emerge.

Lengthening of the epicotyl is thought to be controlled by the phytochrome photoreceptors.

« Back to Glossary Index