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Describe the histogen theory....

Describe the histogen theory.

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Histogen theory is proposed by Hanstein (1868) and supported by Strassburger.The shoot apex comprises three distinct zones.
(i)Dermatogen:It is a outermost layer.It gives rise to epidermis.
(ii)Periblem:It is a middle layer.It gives rise to cortex.
(iii)Plerome:It is innermost layer. It gives rise to stele.
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