Abstract
This study on the cambium of Pinus sylvestris L. examines the intrusive growth of fusiform cambial initials and its possible contribution to the tangential and radial expansions of the cambial cylinder. The location and extent of intrusive growth of the fusiform initials were determined by microscopic observations and by mathematical modeling. In order to meet the required circumferential expansion of the cambial cylinder, the fusiform initials grow in groups by means of a symplastic rather than intrusive growth, leaving no room for the assumption that intrusive growth of the initials takes place between radial walls and has a direct role in the increase of the cambial circumference. Therefore, it is postulated that the fusiform initials grow intrusively between the tangential walls of the neighboring initials and their immediate derivatives and not between the radial walls of the adjacent initials as per common belief.
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Abbreviations
- N r :
-
Number of periclinal divisions
- L :
-
Circumference of cambial cylinder
- ΔL :
-
Increase in circumference of cambial cylinder
- r :
-
Radius of cambial cylinder
- Δr :
-
Increase in the cambial radius
- l r :
-
Radial width of the fusiform initial
- l c :
-
Tangential width of the fusiform initial
- Δl r :
-
Increase in radial width of the fusiform initial
- Δl c :
-
Increase in tangential width of the fusiform initial
- u r :
-
Radial displacement of the initial cell
- du r :
-
Changes in radial displacement
- dr :
-
Radial width of the intrusively growing cell
- dl :
-
Tangential width of the intrusively growing cell
- ε r :
-
Strain in radial direction
- ε l :
-
Strain in tangential direction
- T :
-
Time span between two successive periclinal divisions
- Δt :
-
Progress of time between two successive periclinal divisions
- a :
-
Factor covering the phases of advancement towards a periclinal division and ranging in value from zero to one
- t 0 − t 9 :
-
Ten consecutive time intervals during the growth of a fusiform initial
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Karczewska, D., Karczewski, J., Włoch, W. et al. Mathematical Modeling of Intrusive Growth of Fusiform Initials in Relation to Radial Growth and Expanding Cambial Circumference in Pinus sylvestris L.. Acta Biotheor 57, 331–348 (2009). https://doi.org/10.1007/s10441-009-9068-y
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DOI: https://doi.org/10.1007/s10441-009-9068-y