Amano Rumi, Nakayama Hokuto, Morohoshi Yurika, Kawakatsu Yaichi, Ferjani Ali, Kimura Seisuke
Department of Bioresource and Environmental Sciences, Kyoto Sangyo University, Kyoto-City, Kyoto, Japan.
Department of Plant Biology, University of California Davis, Davis, California, United States of America.
PLoS One. 2015 Nov 16;10(11):e0141247. doi: 10.1371/journal.pone.0141247. eCollection 2015.
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.
为了使器官和结构维持在合适的大小，多细胞生物在形态发生过程中精心协调细胞增殖和有丝分裂后细胞的扩张。最近利用拟南芥叶片进行的研究表明，补偿作用是这种协调的一个例子，补偿作用被定义为在侧生器官发育过程中，由于细胞数量减少而诱导的有丝分裂后细胞的扩张。通过遗传分析和嵌合体分析揭示了补偿作用背后的一些基本分子机制。然而，迄今为止，补偿作用仅在突变体、转基因植物和经γ射线处理的植物中观察到，尚不清楚它是否发生在自然条件下的植物中。在这里，我们证明环境温度的变化可以诱导北美半水生植物水沼生蔊菜（十字花科）产生补偿作用。结果表明，补偿作用是被子植物中的普遍现象，并且补偿作用的机制在拟南芥和水沼生蔊菜之间部分共享。
