Their findings showed that the fertile-zone morphological modifications correspond to several anatomical ones, especially in relation to the early development of periderm
and loss of fibers in the secondary xylem and phloem.
Stem Epidermis 16.94 18.61 17.70 0.74 14.68 19.10 cell Pith cell 30.34 76.03 51.28 17.83 (diameter) Trachea 8.85 18.33 14.67 3.75 (diameter) Endodermis 6.81 13.04 10.67 2.78 18.74 39.37 cell Leaf Upper 8.78 26.01 18.01 7.37 24.16 42.42 epidermis cell Upper 18.38 20.31 19.05 0.79 21.79 34.53 stomata Trachea 4.66 11.24 7.03 2.08 (diameter) Lower 12.07 17.10 14.17 2.15 18.48 26.52 stomata Lower 7.73 14.22 11.62 2.97 26.23 16.94 epidermis cell Root Periderm
9.54 15.26 13.12 2.41 16.17 22.80 cell Trachea 13.84 34.75 22.01 7.71 (diameter) Avr.
Microstructure and composition of the periderm
may occur (Figure 4B) in certain regions of petiole's adaxial and abaxial surface, from subepidermal origin.
After the first hour of incubation, Pb was found in the cell walls of periderm
of the rhizomes of all the plants, wherein a small amount of the metal was also found in the outer layers of the cortex of the Filipendula ulmaria.
Tegelaar EW, Hollman G, Vandervegt P, de Leeuw JW, Holloway PJ (1995) Chemical characterization of the periderm
tissue of some angiosperm species: Recognition of an insoluble, nonhydrolyzable, aliphatic biomacromolecule (suberan).
Expression of resistance to two distinct diseases suggested a possible common mechanism expressed in the tuber periderm
. It was postulated that this may confer enhanced resistance to other diverse tuber diseases including black scurf and tuber soft rot.
Buchanan, "Endophytic bacterial communities in the periderm
of potato tubers and their potential to improve resistance to soil-borne plant pathogens," Plant Pathology, vol.
Peterson, "Casparian bands occur in the periderm
of Pelargonium hortorum stem and root," Annals of Botany, vol.
Skin development begins at 36 days of gestational age, with the formation of an epidermis consisting only of a basal layer of cells and a superficial periderm
Less than 8 months later--assuming normal development--the newborn emerges with soft, moist, resilient skin that provides an excellent barrier that adapts rapidly to the change from immersion in liquid to air and light exposure.