Cell expansion-mediated organ growth is affected by mutations in three EXIGUA genes.

PloS One
Silvia Rubio-DíazJosé Luis Micol

Abstract

Organ growth depends on two distinct, yet integrated, processes: cell proliferation and post-mitotic cell expansion. Although the regulatory networks of plant cell proliferation during organ growth have begun to be unveiled, the mechanisms regulating post-mitotic cell growth remain mostly unknown. Here, we report the characterization of three EXIGUA (EXI) genes that encode different subunits of the cellulose synthase complex specifically required for secondary cell wall formation. Despite this highly specific role of EXI genes, all the cells within the leaf, even those that do not have secondary walls, display small sizes in the exi mutants. In addition, we found a positive correlation between cell size and the DNA ploidy levels in exi mutant leaves, suggesting that both processes share some regulatory components. Our results are consistent with the hypothesis that the collapsed xylem vessels of the exi mutants hamper water transport throughout the plant, which, in turn, limits the turgor pressure levels required for normal post-mitotic cell expansion during leaf growth.

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Citations

Jul 19, 2013·The Arabidopsis Book·Hirokazu Tsukaya
Aug 12, 2014·Planta·Eduardo Mateo-BonmatíJosé Luis Micol
Feb 11, 2014·Current Opinion in Plant Biology·Jo Hepworth, Michael Lenhard
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Jul 11, 2013·PloS One·Almudena Ferrández-AyelaMaría Rosa Ponce
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Jul 11, 2020·Science·Pallinti PurushothamJochen Zimmer
Apr 28, 2021·Plant Science : an International Journal of Experimental Plant Biology·Alba Manga-RoblesPenélope García-Angulo
Jul 25, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Gerasimos DarasStamatis Rigas

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Methods Mentioned

BETA
scanning electron microscopy
infrared spectroscopy
environmental stress
PCR
confocal microscopy
FACS
electrophoreses
electrophoresis

Software Mentioned

SIGnAL
NIS Elements AR
SPSS ( Statistical Package for the Social Sciences )
SPSS
FACSDiva
Adobe Photoshop CS3
ImageJ

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