背景回顾：The diversity and environmental plasticity of plant growth results from variations of repetitive modules, such as the basic shoot units made of a leaf, axillary bud, and internode. 

提出问题：Internode elongation is regulated both developmentally and in response to environmental conditions, such as light quality, but the integration of internal and environmental signals is poorly understood. 

主要发现：Here, we show that the compressed rosette growth habit of Arabidopsis is maintained by the convergent activities of the organ boundary gene ARABIDOPSIS THALIANA HOMEOBOX GENE 1 (ATH1) and of the gibberellin-signaling DELLA genes. 

结果1-功能缺失突变：Combined loss of ATH1 and DELLA function activated stem development during the vegetative phase and changed the growth habit from rosette to caulescent. 

结果2-下游通路：Chromatin immunoprecipitation high-throughput sequencing and genetic analysis indicated that ATH1 and the DELLA gene REPRESSOR OF GA1-3 (RGA) converge on the regulation of light responses, including the PHYTOCHROME INTERACTING FACTORS (PIF) pathway, and showed that the ATH1 input is mediated in part by direct activation of BLADE ON PETIOLE (BOP1 and BOP2) genes, whose products destabilize PIF proteins. 

结论：We conclude that an organ-patterning gene converges with hormone signaling to spatially restrict environmental responses and establish a widespread type of plant architecture.

 摘 要 

植物生长的多样性和环境可塑性源自于重复模块的变异，如由叶、腋芽和节间组成的基本茎单元。节间伸长同时受到发育和响应环境条件（如光照质量）的调控，但是植物内部和外部环境信号是如何整合的还不清楚。本文中，作者发现拟南芥莲座叶的紧实结构是由器官边界基因ATH1和赤霉素信号转导基因DELLA共同维持的。ATH1和DELLA基因同时功能缺失会激活营养生长期间茎的发育，改变拟南芥的莲座叶结构，变为具茎结构。染色质免疫共沉淀高通量测序和遗传分析显示，ATH1和DELLA基因RGA会最后集中于对光响应的调控，包括PIF通路，并且发现ATH1的输入部分由BOP1和BOP2基因的直接激活所介导，而BOP1/2蛋白能够使得PIFs蛋白变得不稳定。因此，作者总结器官模式建成基因与激素信号转导通路共同作用于环境响应的空间限制，建立起一个广泛分布的植株株型结构。