Plant Science

Cell size matters to meristems

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Science  27 Nov 2015:
Vol. 350, Issue 6264, pp. 1052-1053
DOI: 10.1126/science.350.6264.1052-c

In the meristem that generates flowers for the plant Arabidopsis thaliana, the cells are all generally the same size. Serrano-Mislata et al. asked what happens when that regularity is perturbed. Some irregularity occurs naturally, as cell divisions were often a bit unequal, producing daughters of different sizes. Experimental manipulation of cell cycle progression introduced other irregularities. Persistent disruption of cell-size controls correlated with irregular or absent definition of the floral organs generated by the meristem. Regardless of how the irregularities were generated, the meristem corrected size irregularities and brought daughter cells into the same regularized size. The authors hypothesize that without a controlled unit size, the signaling that establishes developmental fates in the meristem becomes scrambled and vague.

Curr. Biol. 25, 1 (2015).

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