Abstract
Based on mathematical modelling, this review article describes the mechanism of expansion in the circumference of vascular cambium due to radial growth leading to increase in the tree-trunk diameter, and emphasizes upon the huge difference in the rate of symplastic growth of cambial initials in two different directions, viz. radial and circumferential. On the basis of anatomical evidence regarding the role of symplastic and intrusive growths, the long-standing hypothesis that the intrusive growth contributes to the increase of cambium circumference has been falsified. It has been shown with the help of mathematical calculations as well as anatomical observations that only symplastic growth of the initial cells (in circumferential direction) is responsible for the expansion of cambial circumference.
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Abbreviations
- S:
-
Surface of a cylinder (S = 2πrh)
- h:
-
Height of cambial cylinder
- C:
-
Circumference of cambial cylinder (C = 2πr)
- Ci :
-
Tangential dimension of initial cell (part of cambial circumference occupied by one initial).
- ΔC:
-
Change in circumference
- ΔCL :
-
Increase in circumference of layer of cambial initials after addition of one cell layer on xylem side (ΔCL = 2πΔrL)
- ΔC1 :
-
Increase in the Earth’s perimeter after addition of 1 m to its radius
- ΔCi :
-
Increase in cambial circumference per one fusiform initial (ΔCi = ΔCL / N)
- N:
-
Number of cambial initial cells on the cambial circumference
- r:
-
Radius
- ri :
-
Radial dimension of one initial cell
- Δr:
-
Change in radius
- ΔrL :
-
Change in radius of cambial cylinder caused by the deposition of one cell layer on xylem side
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Miodek, A., Włoch, W., Iqbal, M. et al. Controversy over the Mode of Growth of Cambial Cylinder. Bot. Rev. 87, 243–257 (2021). https://doi.org/10.1007/s12229-020-09237-9
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DOI: https://doi.org/10.1007/s12229-020-09237-9