Wood Fibres With Living Protoplasts

Abstract

Summary It has been observed that in many woody plants the libriform fibres, and in some the fibre tracheids, retain living protoplasts in the entire sapwood. It is suggested, therefore, that the definition of fibres usually given in botanical textbooks, should be changed. From the preliminary study it appears that living protoplasts persist mainly in shrubs and subshrubs. As these life‐forms generally represent the woody vegetation of unfavourable habitats, it may be possible that living fibres are adaptive characters.

The Role of Xylem Parenchyma in the Storage and Utilization of Nonstructural Carbohydrates

“…Thus, intermediary patterns and co-occurrence of more than one type of axial parenchyma are frequently observed. Besides thin-walled parenchyma cells, some thick-walled axially oriented cells, which could be hence termed fi bers, also retain living protoplasts (Fahn and Leshem 1963 ). Axial cells that can be classifi ed as living fi bers rather than parenchyma occur, for instance, in Acer ( Fig.…”

La membrana de la punteadura en dos especies de Cacteae, Cactaceae

“…Con este estudio se confirma que las fibras de Echinocactus son células vivas, como lo reporta Mauseth (2006) para otros miembros de la familia, ya que contienen organelos (núcleo y mitocondrias). Este tipo celular conserva su protoplasto y almacena sustancias como almidón, aceite y resinas, además de conferirle soporte a la planta (Fahn y Leshem, 1963). Su estudio, por primera vez a nivel de MET, confirma que son fibras nucleadas en E. grusonii.…”

Comparative study on morpho-anatomy of leaf, stem and root of Boerhaavia diffusa L. (Nyctaginaceae) and its adulterant plants

“…According to Fahn and Leshem (1963) nucleated xylem fibers is an adaptive feature, which is associated with diminishing supportive function. They display a transition towards parenchyma cells that occur in herbaceous plants.…”