protonema

Term Information

Accession
PO:0030003
Aspect
plant anatomy
Synonyms
exact: portion of protonema tissue
exact: protonema (Spanish)
exact: protonemata
exact: 原糸体 (Japanese)
Definition
A portion of chlorenchyma tissue that develops directly from a spore and grows by division of an apical cell to form filaments that are one cell wide and dichotomously branching. [source: POC:Ramona_Walls]
Comment
The protonema is the first structure that develops in the gametophytic phase of mosses, some other bryophytes, and leptosporangiate ferns. The term protonema is also used to refer to the phase of development in which protonemal tissue is produced (see PO:0030006 protonema phase). In some species of moss, the protonema is perennial. A protonema may develop from sporophytic tissue during apospory.

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External References

closePO_GIT (1)

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