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Time-evolving genetic networks reveal a NAC troika that negatively regulates leaf senescence in Arabidopsis [Plant Biology]

Leaf senescence is regulated in a complex manner, involving time-dependent interactions with developmental and environmental signals. Genetic screens have identified key regulators of senescence, particularly late-stage senescence regulators. Recently, time-course gene-expression and network analyses, mostly analyses of static networks, have predicted many senescence regulators. However, senescence is defined by time-evolving networks, involving the temporal transition of interactions among senescence regulators. Here, we present time-evolving networks of NAM/ATAF/CUC (NAC) transcription factors, central regulators of leaf senescence in Arabidopsis , via time-course gene-expression analysis of NACs in their mutants. These time-evolving networks revealed a unique regulatory module of NACs that controls the timely induction of senescence-promoting processes at a presenescent stage of leaf aging.

Authors:   Hyo Jung Kim; Ji-Hwan Park; Jingil Kim; Jung Ju Kim; Sunghyun Hong; Jeongsik Kim; Jin Hee Kim; Hye Ryun Woo; Changbong Hyeon; Pyung Ok Lim; Hong Gil Nam; Daehee Hwang
Journal:   Proceedings of the National Academy of Sciences current issue
Volume:   115
edition:   21
Year:   2018
Pages:   E4930
DOI:   10.1073/pnas.1721523115
Publication date:   22-May-2018
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