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The first leaf of a monocotyledon seedling.



the first leaf of cereal grasses, which has no blade and consists of a closed tubule. It is colorless, green, or reddish. The coleoptile encloses and protects the young sprout, the plumule, and the growing point of the stem. It penetrates the soil with its hard apex, which then ruptures; causing the grain to sprout. A new leaf emerges from the top of the coleoptile. The coleoptile, which subsequently dries up, apparently is the middle part of the cotyledon.

References in periodicals archive ?
On onion, the UCEEs from both plants (Table 2) inihibited significantly root and coleoptile growth on the largest tested concentration, with a mean inhibition of 9% on root and 15% on coleoptile.
Dilday says, the lengths of the mesocotyl and coleoptile were actually doubled.
Equation (8) First vigor index = (length Coleoptile + Average length of root) x percentage Seed germination
by stating: "The coleoptile and coleorhiza are not considered to be parts generated by the eventual shoot and root meristems.
The figure of Malayer was specified the highest percentage of germination, coleoptile length, radicle length and seedling length, the rate germination and index of seed basis.
lower part of coleoptile, forming saxophone-shaped projection below the
When coleoptile and root length of a seed reached to 2-3 mm, the seed was scored as a germinated seed.
Plumular-radicular axis angular; primary root straight and persistent; collar roots develop or do not develop; hyperphyll elongate; cotyledonary sheath apical opening; coleoptile present; cataphylls two; eophyll pinnate, apex acute; venation pinnate; reduplicate.
In experiments on corn and soybean it was found that compounds in the soil from residue extracts affected foxtail potential, reduced root growth of corn, coleoptile development, growth in height and weight and prevented germination [3].
Genotypic increases in coleoptile length improves stand.
Injuries to cereal seeds caused by organic mercurials has been characterized by abnormal germination and hypertrophy of the roots and coleoptile.