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Titolo:
Autoreproductive cells and plant meristem construction: the case of the tomato cap meristem
Autore:
Barlow, PW; Luck, HB; Luck, J;
Indirizzi:
Univ Bristol, Dept Agr Sci, Long Ashton Res Stn, Inst Arable Crops Res, Bristol BS41 9AF, Avon, England Univ Bristol Bristol Avon England BS41 9AF ristol BS41 9AF, Avon, England
Titolo Testata:
PROTOPLASMA
fascicolo: 1-4, volume: 215, anno: 2001,
pagine: 50 - 63
SICI:
0033-183X(2001)215:1-4<50:ACAPMC>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROOT;
Keywords:
autoreproductive cell; epidermis; lateral-root primordium; L-system; root cap; tomato;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Barlow, PW Univ Bristol, Dept Agr Sci, Long Ashton Res Stn, Inst Arable Crops Res, Bristol BS41 9AF, Avon, England Univ Bristol Bristol Avon EnglandBS41 9AF 9AF, Avon, England
Citazione:
P.W. Barlow et al., "Autoreproductive cells and plant meristem construction: the case of the tomato cap meristem", PROTOPLASMA, 215(1-4), 2001, pp. 50-63

Abstract

Root apical meristems are composed of two zones in which either formative or proliferative cell divisions occur. Within the formative zone, autoreproductive initial cells (a-cells) occupy distinctive locations. By means of graph-L-systems, the behavior of one such type of a-cells has been investigated, with particular reference to root caps within the developing primordiaof lateral roots of Lycopersicon esculentum cultivated in vitro. Here, thea-cells constitute the "protoderm initials", cells which are found also inthe root cap of many angiosperm species. A set of cuboidal (i.e., six-sided) a-cells develops early in the ontogeny of a lateral-root primordium. Then, according to both anatomical observations and theoretical simulations obtained by the application of graph-L-systems, sequential production of descendents from each a-cell leads to the formation of a new autoreproductive cell (a), a cap columella initial (c), and two mother cells (e and f) whose respective descendents differentiate as root epidermis and cap flank cells. In this graph-L-system, there is specification of the location of sister cells with respect to the three orthogonal directions of a cuboidal. In the early stage of root cap formation, only a few rounds of these formative cell divisions by each a-cell and its four types of descendents are required to provide the basic set of cells necessary for full cap development. After the lateral root emerges from the parent root, there may be a temporary cessation of the formative divisions of the a-cells which give rise to columella initials. Columella production is then supported entirely by its own independent set of autoreproductive c-initials. At the same time, division of the autoreproductive protoderm initial cell is directed towards maintainingthe cap flank and the epidermal cell files. The regulation of the types offormative division by the a-cell may be represented by means of a divisioncounter which may be specific for a given species.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/01/21 alle ore 07:33:01