A Decrease in Ambient Temperature Induces Post-Mitotic Enlargement of Palisade Cells in North American Lake Cress

0303 health sciences Science Q Cell Cycle R Arabidopsis Temperature Mitosis Cell Communication Environment Plant Leaves 03 medical and health sciences Phenotype Species Specificity Gene Expression Regulation, Plant Rorippa Medicine Phylogeny Plant Physiological Phenomena Research Article Cell Proliferation Cell Size
DOI: 10.1371/journal.pone.0141247 Publication Date: 2015-11-16T22:53:58Z
ABSTRACT
In order to maintain organs and structures at their appropriate sizes, multicellular organisms orchestrate cell proliferation and post-mitotic cell expansion during morphogenesis. Recent studies using Arabidopsis leaves have shown that compensation, which is defined as post-mitotic cell expansion induced by a decrease in the number of cells during lateral organ development, is one example of such orchestration. Some of the basic molecular mechanisms underlying compensation have been revealed by genetic and chimeric analyses. However, to date, compensation had been observed only in mutants, transgenics, and γ-ray-treated plants, and it was unclear whether it occurs in plants under natural conditions. Here, we illustrate that a shift in ambient temperature could induce compensation in Rorippa aquatica (Brassicaceae), a semi-aquatic plant found in North America. The results suggest that compensation is a universal phenomenon among angiosperms and that the mechanism underlying compensation is shared, in part, between Arabidopsis and R. aquatica.
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