periderm


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per·i·derm

, periderma (per'i-derm, -i-dĕr'mă),
The outermost layer of the epidermis of the embryo and fetus to the sixth month of intrauterine life; desquamated peridermal cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium
[peri- + G. derma, skin]

periderm

/peri·derm/ (per´ĭ-derm)
1. the outer layer of the bilaminar fetal epidermis, generally disappearing before birth.
2. the cuticle (eponychium and hyponychium), the only part of the periderm persisting after birth.periderm´al

periderm

[per′idurm]
the outermost layer of flattened epidermis on an embryo or fetus during the first 6 months of gestation.

periderm

A transiently expressed superficial layer that surrounds the developing epidermis.

per·i·derm

, periderma (per'i-dĕrm, -dĕr'mă)
The outermost layer of the epidermis of the embryo and fetus up to the sixth month of intrauterine life; desquamated epitrichial cells are a considerable component of the vernix caseosa.
Synonym(s): epitrichium.
[peri- + G. derma, skin]

periderm

a protective tissue formed in roots and stems that has undergone SECONDARY THICKENING, consisting of an outer cork zone, an underlying phellogen (cork cambium) and with a phelloderm (secondary cortex) beneath that.

periderm

the outer layer of the bilaminar fetal epidermis, generally disappearing before birth. Called also epitrichium.
References in periodicals archive ?
The metaphyll's petiole shows similarity with the eophyll, except for the presence of trichomes, periderm on both sides (mainly at the base and on the adaxial side), idioblasts with druses, and primordium fibers on the phloematic region.
Within 24 h, Ni was detected in all tissues of the root--from the periderm to the vascular bundles.
Beneath the cork in the periderm are the cork cambium, an area where cell division occurs, and the thin, green cork skin, found by gently scraping away the outer bark on a young twig.
13) were constituted only by bark, that is, periderm and secondary phloem (Fig.
The first periderm formed grows during irregular periods of cork cambial activity, often keeping pace with the lateral growth of the stem for many years.
Values for maximum crushing strength could not be obtained under the conditions employed since the spongy obliterated phloem tissues between the periderm tissues were so weak, and failed continuously, that an abrupt mechanical failure could not be recorded.
The permeability of the skin of the tuber is a function of its maturity and is significant in the rate of respiration for example the periderm of freshly harvested immature tubers is most permeable and thus permits higher levels of respiration than similarly harvested mature tubers.
Irrigation scheduling is used to prepare for the first fall frost by imposing water stress on the vine to encourage periderm formation on green shoots.
Distribution of CA125 in embryonic tissues and adult derivatives of the fetal periderm.
Like belowground fine rootlets [ILLUSTRATION FOR FIGURE 4D OMITTED], sponge-rootlets have an unpigmented periderm, a well-developed cortex, and a less-pronounced stele.
the periderm of young red mangrove shoots is mined by larvae of Marmara sp.
Ontogeny of periderm and phellogen activity in Ceratonia siliqua L.