- Cytokinins are the plant growth substances
which promote cell division and are primarily involved in the cell
growth.
- They regulate cell cycle by mediating the expression of the
cyclin gene TgCYC4. Trans-zeatin, which is a natural form
of cytokinin, upregulated the expression of this cyclin and a
synthetic cytokinin called thidiazuron downregulated the expression
of cyclin.
In this way, cytokinins are involved in the progression of cell
cycle in higher plants.
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