tubercle

Term Information

Accession
PO:0025352
Aspect
plant anatomy
Synonyms
exact: podaria
exact: podarium
exact: 小塊茎、塊根 (Japanese)
Definition
An enlarged leaf base (PO:0020040) that is fused with adjacent shoot axis (PO:0025029) tissue. [source: ISBN:9780881928501, JSTOR:3093870]
Comment
Found in cacti and other succulents. The upper part of a leaf from which a tubercle develops is usually shed early in development. Tubercles are often conical, but they may merge with those directly above and below to form ribs, as in saguaro (Carnegiea), or they may elongate, as in species of pincushion cacti (Mammillaria). In species with tubercles, the areole bud (PO:0025353) is often found at the distal end of the tubercle. The areole bud originates in the leaf axil (PO:0009023) of the leaf that becomes the tubercle, but is displaced to the tip through elongation of the tubercle.

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External References

closePO_GIT (1)

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