Structural Aspects of Root Thickening in Beta vulgaris L.: Comparative Thickening in Sugarbeet and Chard

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Abstract
Root thickening in Beta vulgaris L. occurs through the initiation of numerous concentric anomalous cambia and by the production of heavily parenchymatous tissues between those cambia. Comparisons of sugarbeet and chard storage roots revealed similarities in cambium numbers, cell division rates, and the relative contributions of the various intercambial zones to root thickening. Large differences in cell expansion were the main factors accounting for differences in root sizes. Intercambial cell enlargement patterns are discussed in terms of rate and duration of cell expansion with reference to the origins of the intercambial cells.