cotyledon

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cotyledon

 [kot″ĭ-le´don]
1. any subdivision of the uterine surface of the placenta.
2. irregular convex areas on the chorionic surface of the placenta, consisting of two or more stem villi and their many branch villi; by the end of the fourth month the decidua basalis is almost entirely replaced by the cotyledons.

cot·y·le·don

(kot'i-lē'don),
1.
2. In plants, a seed leaf, the first leaf to grow from a seed.
3. A placental unit.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

(kŏt′l-ēd′n)
n.
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.

cot′y·le′don·ar′y (-ēd′n-ĕr′ē), cot′y·le′don·al (-ēd′n-əl)(-ēd′n-əs), cot′y·le′do·nous (-ēd′n-əs) adj.

cot·y·le·don

(kot'i-lē'dŏn)
1. In plants, a seed leaf, the first leaf to grow from a seed.
2. Irregular convex area of the fetal part of the placenta composed of stem villi.
[G. kotylēdon, any cup-shaped hollow]

cotyledon

  1. a part of the plant embryo in the form of a specialized seed leaf that can be thin and papery, as in the castor oil plant, or can act as a storage organ, as in the broad bean, absorbing food from the endosperm. Sometimes it also functions as a leaf after EPIGEAL germination, as in the runner bean. Some ANGIOSPERMS have one cotyledon per seed (MONOCOTYLEDONS) while others have two (DICOTYLEDONS).
  2. a part of the mammalian placenta on which a tuft of villi occurs, particularly in ruminants.
References in periodicals archive ?
In current study, an efficient and stable Agrobacterium-mediated genetic transformation approach using cotyledonary node explants in cucumber with CsEXP10 gene has been developed, which can be successfully used for the introduction and functional analysis of desired genes.
Various explants such as leaf, stem, epicotyl, node, internode, axillary shoot tip, petiole, hypocotyl, root, cotyledonary leaf, and embryo are employed for regeneration (Tables 2 and 3).
According to previous studies of cotton tissue culture, callus culture can be initiated from different explants such as hypocotyls, radicals, tissues of embryo, shoot apex, cotyledonary leaves etc.
The embryo is laterally inserted at the end of the seed and consists of a cylindrical region, which is the cotyledonary petiole, and a distal region that makes up the cotyledonary limb or the haustorium (Figure 2B).
This occurrence is similar to reports on micropropagation of Cassia sophera using cotyledonary node explants where shoot length was increased with higher TDZ levels of upto 2.5 [micro]M, after which the shoot length began to decrease [40].
Wang, "Assessment of conditions affecting Agrobacterium-mediated soybean transformation using the cotyledonary node explant," Euphytica, vol.
Transformation of lenti (Lens culinaris M.) Cotyledonary Nodes by Vacuum Infiltration of Agrobacterium tumefaciens.
Those embryos that reached the mature cotyledonary stage were subcultured in B5 medium supplemented with 30g x [l.sup.-1] sucrose, without growth regulators under light conditions, for root emergence and foliage development.
High frequency shoot regeneration from cotyledonary node explants of different lentil (Lens culinaris Medik) genotypes and in vitro micrografting.
These species exhibit central implantation and have placentae of the diffuse and cotyledonary types.
On day 75 of pregnancy, placentomes from each ewe were fixed with Carnoy's solution by perfusion of the main vessel supplying the cotyledonary (COT; fetal) tissue.