A systems biology approach identifies new regulators of poplar root development under low nitrogen

The Plant Journal : for Cell and Molecular Biology
Madhumita DashVictor B Busov

Abstract

In Populus, low nitrogen (LN) elicits rapid and vigorous lateral root (LR) proliferation, which is closely mirrored by corresponding transcriptomic changes. Using transcriptomic data, we built a genetic network encompassing a large proportion of the differentially regulated transcriptome. The network is organized in a hierarchical fashion, centered on 11 genes. Transgenic manipulations of only three of the 11 genes had a strong impact on root development under LN. These three genes encoded an F-box protein similar to Hawaiian Skirt (PtaHWS) and two transcription factors (PtaRAP2.11 and PtaNAC1). Up- and downregulation of the three genes caused increased and decreased root proliferation under LN conditions, respectively. The transgenic manipulations had a strong positive effect on growth under greenhouse conditions including increased shoot and root biomass. The three genes appeared to encompass a putative yet-unknown mechanism that underlies root development under LN. Specifically, the genes are predominantly expressed in roots and have a similar temporal response to LN. More importantly, transgenic manipulation for each of the three genes had a highly significant impact on the expression of the other two. The transgenic manipu...Continue Reading

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Citations

Jul 28, 2016·Plant Signaling & Behavior·Madhumita DashVictor Busov
Nov 5, 2016·The Plant Journal : for Cell and Molecular Biology·Madhumita DashVictor Busov
Sep 22, 2017·PloS One·Zinnia H González-CarranzaJeremy A Roberts
Oct 5, 2016·Advances in Physiology Education·Melanie Rae Simpson
Oct 17, 2018·Frontiers in Plant Science·Francisco M CánovasConcepción Avila
Mar 30, 2021·Frontiers in Plant Science·Lihua ZhangMingjun Li

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