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A cell of a plant, fungus, bacterium, or archaeon from which the cell wall has been removed, leaving the protoplasm and plasma membrane.

[French protoplaste, from Old French, the first man, from Late Latin prōtoplastus, from Greek prōtoplastos : prōto-, proto- + plastos, formed, molded; see -plast.]

pro′to·plas′tic adj.


(Biology) a unit consisting of the living parts of a cell, including the protoplasm and cell membrane but not the vacuoles or (in plants) the cell wall
[C16: from Late Latin prōtoplastus the first-formed, from Greek prōtoplastos, from proto- + plassein to shape]
ˌprotoˈplastic adj


(ˈproʊ təˌplæst)

a. the contents of a cell within the cell membrane, considered as a fundamental entity.
b. the primordial living unit or cell.
2. a person or thing that is formed first; original; prototype.
3. the hypothetical first individual or one of the supposed first pair of a species or the like.
[1525–35; < Late Latin prōtoplastus the first man, n. use of Greek prōtóplastos formed first]
pro`to•plas′tic, adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.protoplast - a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts
cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals
body part - any part of an organism such as an organ or extremity


A first form from which varieties arise or imitations are made:


n (Bot) → Protoplast m
References in periodicals archive ?
Such media outlets as Gazeta Wyborcza, Radio TOK FM, and the Batory Foundation have their ideological protoplasts in the March '68 revisionists and in the KOR (Committee for the Defense of Workers).
By the simultaneous application of two SgRNA, there was a large and significant deletion made of up to 245 kb in the chromosome in rice protoplasts (48).
Pre-cultivation of protoplasts, accelerating cell-growth rate, is to be carried out to increase productivity.
High efficiency colony formation and whole plant regeneration from mesophyll protoplasts of Pelargonium X hortorum 'panache sud'.
megaterium is possible via protoplasts transformation or transconjugation.
Plant tissue can be treated with Viscozyme to obtain protoplasts, but yields are low and intact cells contaminate the samples.
Protoplasts were successfully isolated from two different explant types: hyperhydric leaves and etiolated hypocotyl tissue, both obtained from in vitro germinated seedlings of A.
Transient expression in Arabidopsis thaliana protoplasts derived from rapidly established cell suspension cultures.
An improved protocol for microcallus production and whole plant regeneration from recalcitrant banana protoplasts (Musa spp.
1 cultures were grown for hr in SAB-UU broth and protoplasts were prepared by gentle agitation of mycelia in a 5% (w/v) Glucanex (Novozymes, Switzerland) solution for 2 hr at 30[degrees]C.