Architecture of the Rhizome


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The rhizome is more identical to an underground pole than to a root. It accumulates and stores the reserves necessary for future growth of canes. It is characterized by buds which can evolve in several ways:
- Producing a new rhizome
- Producing a cane
- Or remaining as a bud in reserve for future development when necessary.

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The following table summarizes the different combinations of rhizome network (Source: AEB France):

Traçant [Running]	Leptomorphe [Leptomorph]	Illimité [unlimited]	I
	Leptomorphe [Leptomorph]	Amphipode [Amphipode]	T Cette forme est instable et représente une transition entre I et II [This form is unstable and make a transition between forms I and II
	Pachymorphe [Pachymorph]	Limité [Limited]	V
Pluricespiteuse [Pluricespitose]	Leptomorphe [Leptomorph]	Amphipode [Amphipode]	II
	Diplomorphe [Diplomorph]		III
	Pachymorphe [Pachymorph]	Amphipode [Amphipode]	IV
	Pachymorphe [Pachymorph]	Limité [Limited]	VI
Cespiteux [Cespitose]	Pachymorphe [Pachymorph]	Limité [Limited]	VII

The most common type is the cespitose type (VII).

The pachymorphe type is present mainly in tropical areas (72%) and appears as the ancestral form of the leptomorphe type adapted to temperate zones (75%). This hypothesis is based on several arguments:
- Only 10% of tropical species have a type leptomorphe while 28% of temperate species have still pachymorph rhizomes (--> legacy)
- Some Leptomorph species have the ability to switch from one type of rhizome to a similar type depending of the age and environmental conditions (unlike type pachymorphe). this reveals heredity capacity to change. ( --> differentiation).

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