单词	epicotyl
释义	epicotyl /ˌɛpɪˈkɒtɪl / noun Botany The region of an embryo or seedling stem above the cotyledon.These enzymes have also been detected in a wide range of plant organs and tissues undergoing developmental changes such as seeds, cotyledons, elongating epicotyls, and in freshly harvested asparagus spears.... However, in coleoptiles, hypocotyls and epicotyls, gravity can be perceived along the whole length of the responding region and there is no such need to postulate any longitudinal transfer of a message. At this stage, both the cotyledons and epicotyls (if visible) were green.
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