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Histogen theory of Stem. Explain....

Histogen theory of Stem. Explain.

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Histogen theory is prooposed by Hanstein (1868) and supported by Strassburgur. The shoot apex comprises three distinct zones.
1. Dermatogen : It is a outermost layer. It gives rise to epidermis.
2. Periblem : It is a middle layer. It gives rise to cortex.
3. Plerome : It is innermost layer. It gives rise to stele.
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