periderm

(redirected from periderma)
Also found in: Dictionary, Encyclopedia.

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

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.
References in periodicals archive ?
Lo anterior sugiere a Jag2 como el ligando responsable de la activacion de Notch1 y de la diferenciacion del periderma oral.
A nivel biologico los microtuberculos en Cl y C2 presentaron buena esfericidad y coloracion y ausencia de hiperhidratacion y callosidad sobre el periderma. En C5 se presentaron problemas de hiperhidratacion y callosidad sobre el epiderma, principalmente con phurejas.
Los microtuberculos de las accesiones que presentaron problemas de hiperhidratacion formaron sobre el periderma una especie de "callosidad", bajo numero de brotes, lenticelas de mayor tamano.
La apoptosis ocurre solo en las celulas del periderma.