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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 ?
Caption: FIGURE 2: Effect of BA, with and without IBA or NAA, on the shoot regeneration rate in explants from epicotyls of Aspidospermapolyneuron.
6%), thickening of hypocotyls, strong reduction of epicotyls and roots with few or no lateral root formation (Fig.
The epicotyl (Figure 4A) consists of uniseriate epidermis with unicellular non-glandular trichomes, collenchymatous and parenchymatous cortex, and central cylinder composed of two collateral vascular bundles and phloematic strands that surround the parenchymatous pith.
Thus, the minimum optimal number of plants to be measured to represent the average hypocotyl length was 45, 53, 52 and 45 for BRS Valiosa RR, Agua-Marinha RR, UFVS 2010 and NK 7059 RR, respectively, whereas the average length of the epicotyls was 49, 43, 51 and 49 for BRS Valiosa RR, Agua-Marinha RR, UFVS 2010 and NK 7059 RR, respectively (Figure 1).
In conclusion, in terms of number of callus and hormone reactivity, epicotyls and hypocotyls explants and zygotic embryos were the most suitable explants material.
Data were collected on fresh weight (FW, g) of leaf blade (LFW), and on FW and length (L, cm) of the epicotyl (EL and EFW), hypocotyl (HL and HFW), first leaf petiole (FL and FFW), trifoliate leaf petiole (TL and TFW) and root (RL and RFW).
Parrott (2000) A protocol for repetitive somatic embryogenesis from mature peanut epicotyls.
Most citrus in vitro organogenesis protocols are based on the culture of young tissue, mainly epicotyls and intermodal segments (GARCIA-LUIS et al.
Dopico B, Nicolas G, Labrador E (1989) Partial purification of cell wall [beta]-galactosidases from Cicer arietinum epicotyls.