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Definition of COLEOPTILE. : the first leaf of a monocotyledon forming a protective sheath about the plumule.
Coleoptile leaf (1st leaf) visible. This leaf will be shorter than later. emerging leaves and has a rounded tip. ! Growing point of the plant should be 1 to 1Â½ inches below the soil. surface. Permanent (nodal) root system will begin developing at this. point. If seed is planted too shallow the root system will have a difficult. time becoming established. 2-Leaf ! Collar of the 1st true leaf (not the coleoptile leaf) is visible. Plant is still. relying primarily on seed reserves for survival. 3-Leaf ! Collar of third leaf visible. Occurs approximately 10 to 14 days after. emergence.