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JXB Advance Access originally published online on April 18, 2007
Journal of Experimental Botany 2007 58(7):1903-1913; doi:10.1093/jxb/erm052
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

A model describing cell polyploidization in tissues of growing fruit as related to cessation of cell proliferation

Nadia Bertin1,*, Alain Lecomte1, Béatrice Brunel1, Svetlana Fishman2 and Michel Génard1

1UR1115 Plantes et systèmes de culture horticoles, INRA, F-84000 Avignon, France
2Department of Statistics and Operations Research, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel

* To whom correspondence should be addressed. E-mail: bertin{at}avignon.inra.fr

Endoreduplication is a phenomenon, widespread among plants, which consists of an incomplete cell cycle without mitosis and leads to the increase of the nuclear DNA content. In this work, a model was developed describing cell proliferation and DNA endoreduplication over the whole fruit development, from the pre-anthesis period until maturation. In each mitotic cycle of duration {tau}, the proportion of cells proceeding through division depends on a constant parameter {rho} and on the progressive decline of the proliferating capacity {theta}. The non-dividing cells may either stop the reduplication fully, or switch to repeated syntheses of DNA without cell division, resulting in cell endoreduplication. A single constant parameter {sigma} describes the proportion of cells that moves from one to the next class of DNA content after each lapse of time {tau}E, considered to be the minimum time required for an endocycle. The model calculates the total number of cells and their distribution among eight classes of ploidy level. The dynamic patterns of cell proliferation and ploidy were compared with those obtained experimentally on two contrasting tomato genotypes. The approach developed in this model should allow the future integration of new knowledge concerning the genetic and environmental control of the switch from complete to incomplete cell cycle.

Key words: Cell division, DNA endoreduplication, model, polyploidy, Solanum lycopersicum, tomato fruit

Received 21 December 2006; Revised 27 February 2007 Accepted 28 February 2007


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