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The embryonic plant stem above the cotyledons.



the part of the stem in a plant seedling between the cotyledons and the first true leaves (the first internode). In embryos the epicotyl is a conoid outgrowth consisting of primary formative tissue, or meristem. In plants with aboveground shoot formation the epicotyl and the cotyledons appear above the surface of the soil (for example, in beans and melons). In plants having underground shoot development the cotyledons remain in the soil, and the epicotyl is bent into a loop and then straightened; it carries the bud with the first leaves to the surface, toward the light (for example, in peas, plums, and oaks).

References in periodicals archive ?
Epicotyl consists of a uniseriate and hairy epidermis, and collenchymatous and parenchymatous cortex, without typical endodermis.
Double coty-node explants were obtained by excising out the epicotyls at the cotyledonary junctions and cutting off the hypocotyls 45 mm beneath the cotyledons.
0, according to maximal length and fresh weight of root, hypocotyl, epicotyl, first leaf petiole, trifoliate leaf petiole and leaf blade.
The emergence of the radicle precedes the emergence of the cotyledons, epicotyl, hypocotyl, and plumule.
The Ministry of Agriculture and the GCNA are also hard at work developing plants from mature female trees using epicotyl grafting, a technique that produces short bushy plants with strong root systems and the capacity to bear fruit within three to four years.
The epicotyl emerges and the cotyledons remain below the soil surface (for example, corn) (Figure 6-23b).
The 113 species are described in both languages, providing scientific name, vernacular name(s) used in East Kalimantan, development of the seedling, including the hypocotyl, cotyledon(s) and epicotyl, leaves, habitat and ecology, uses, and notes, including information on the adult specimens and literature references.
Moreover, they show a highly elongated hypocotyl and minimally elongated epicotyl.
Emergence of the epicotyl is dependent on endosperm carbohydrate reserves, and the maximum depth from which emergence can occur has been shown to be allometrically related to seed size over a range of families and genera (Bond and van Wilgen 1995: Fig.
Germination was determined as the emergence of the epicotyl, and, for the smaller seeds, was done under a 7 x dissecting scope, once a week for 1 mo.