Abstract
Plan B for Stimulating Stem Cell Division
Highlights
Plant development relies on two kinds of coordinated regulatory inputs to generate an optimal plant body
Girth is added through the action of a second source of stem cells. These stem cells are located in a ring within the stem or trunk of a tree, where they generate new vascular cells (Figure 1A)
The position of the procambium between the two types of descendant cells is critical to its production of organized phloem and xylem strands
Summary
Plant development relies on two kinds of coordinated regulatory inputs to generate an optimal plant body. In plants such as trees that show persistent lateral growth, the procambium gives rise to a more substantial, continuous ring of stem cells called a cambium. Regulated orientation of cell divisions within the procambium maintains this organization as newly generated cells are fed into the differentiation pathways.
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