• Corpus ID: 90561663

Studies on the survival rate of ray parenchyma cells with ageing process in coniferous secondary xylem.

  title={Studies on the survival rate of ray parenchyma cells with ageing process in coniferous secondary xylem.},
  author={野渕 正 and 高原 繁 and 原田 浩},

The regulation of sapwood area, water transport and heartwood formation in Sitka spruce

Background: The mechanism by which water transport, tree growth and heartwood formation are balanced is poorly understood. Aims: To test the hypothesis that xylem formation drives heartwood

Heartwood and Tree Exudates

1 Introduction.- 1.1 Prehistoric and Ancient Use.- 1.2 Changing Uses of Forests.- 2 Definitions and Descriptions.- 2.1 Introduction.- 2.2 Sapwood.- 2.2.1 Definitions.- Sapwood.-

Rola śmierci komórek drewna w sukcesie ewolucyjnym roślin drzewiastych

The paper describes the different types of cell death during the process of wood cell formation and terminological variety found in the literature concerned and suggests that for the tracheary elements the digestion of the protoplast occurs immediately after the tonoplast breakdown and these cells are short−lived elements of wood.

Differences in the timing of cell death, differentiation and function among three different types of ray parenchyma cells in the hardwood Populus sieboldii × P. grandidentata

The results indicate that the position within a ray and neighboring short-lived vessel elements might affect the timing of cell death and differentiation and, thus, the function of long-lived ray parenchyma cells in Populus sieboldii × P. grandidentata.

Differences in patterns of cell death between ray parenchyma cells and ray tracheids in the conifers Pinus densiflora and Pinus rigida

The observations indicate that short-lived ray tracheids might affect the pattern of differentiation and, thus, the functions of neighboring long-lived rays parenchyma cells in conifers.

The positional distribution of cell death of ray parenchyma in a conifer, Abies sachalinensis

The results indicate that positional information is an important factor in the control of the pattern of differentiation and, thus, of the functions of ray parenchyma cells that are derived from the same cambial ray cells.

Environmental effects on heartwood extractive content and their consequences for natural durability in Douglas-fir and western redcedar

approved: AN ABSTRACT OF THE DISSERTATION OF Barbara L. Gartner JeffreJ. Morrell Heartwood can have properties that are distinct from sapwood, including resistance to insect and microbial attack.

Distribution and vitality of xylem rays in relation to tree leaf area in douglas-fir

There was a positive relationship between leaf area and the relative volume of ray in outer sapwood at breast height, supporting the hypothesis that Douglas-fir trees with larger leaf areas have higher ray volume than do trees with smaller leaf areas.

The Formation of Heartwood and Its Extractives

During evolution, trees developed several defense systems to maintain long term existence. One of these was the development of durable heartwood, now known to be due to the extractives present. The

Biochemistry of Gymnosperm Xylem Responses to Fungal Invasion

Mechanisms limiting the spread of wood discoloration and decay in living trees have been discussed from several different viewpoints and an alternative view based on microenvironmental conditions is suggested.