Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
click for a larger image
bean seed germinating


1. Botany A leaf of the embryo of a seed plant, which upon germination either remains in the seed or emerges, enlarges, and becomes green. Also called seed leaf.
2. Anatomy One of the lobules constituting the uterine side of the mammalian placenta, consisting mainly of a rounded mass of villi.

[Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object.]

cot′y·le′don·ar′y (-ēd′n-ĕr′ē), cot′y·le′don·al (-ēd′n-əl), cot′y·le′do·nous (-ēd′n-əs) adj.
References in periodicals archive ?
However, there are no reports on cotyledonary leaf explants being used for regeneration studies.
Genomic DNA was isolated from unexpanded cotyledonary leaves of three bean seedlings from each parent and each RIL line according to the protocol of Afanador and Haley (1993) with a modified CTAB extraction procedure (extraction buffer: 1.
Shoot regeneration was also noted on cotyledonary leaves on some explants cultured on TDZ plus IBA containing 1.
It has been reported previously that water deficit stress can result in reduced mobilisation of cotyledonary starch [34] and transport of sucrose from cotyledons to the embryonic axis [26].
Callus induction and plant regeneration from cotyledonary explants of ash gourd (Benincasa hispida L.
SINCE THE FIRST TRANSGENIC SOYBEAN PLANTS were developed via Agrobacterium-mediated transformation of cotyledonary nodes (Hinchee et al.
Combining the data from these two sources, it is possible to develop a generalized scenario for collar development in temperate trees: in angiosperms, and a few gymnosperms, the collar originates from stem tissue immediately above the cotyledonary node.
Micropropagation of Lupinus texensis from cotyledonary node explants.
After one month, those among them reaching the cotyledonary stage (5-10 mm, figure 1) were transferred to MS medium supplemented with 0.
Individual plants were cut 25 mm below the cotyledonary node, removed from the field and fractionated into stems (including branches, petioles, squares, and flowers), leaves, and bolls (fruit).
Because many monocot cotyledons have a clasping base with two thick sides flanking the growing point, some thin longitudinal sections of a cotyledonary node can produce a two-lobed outline with a central growing point.