A micro RNA mediates shoot control of root branching

Moritz Sexauer, Hemal Bhasin, Maria Schön, Elena Roitsch, Caroline Wall, Ulrike Herzog and Katharina Markmann ()
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Moritz Sexauer: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Hemal Bhasin: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Maria Schön: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Elena Roitsch: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Caroline Wall: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Ulrike Herzog: Eberhard-Karls-University, Centre for Molecular Biology of Plants
Katharina Markmann: Eberhard-Karls-University, Centre for Molecular Biology of Plants

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Plants extract mineral nutrients from the soil, or from interactions with mutualistic soil microbes via their root systems. Adapting root architecture to nutrient availability enables efficient resource utilization, particularly in patchy and dynamic environments. Root growth responses to soil nitrogen levels are shoot-mediated, but the identity of shoot-derived mobile signals regulating root growth responses has remained enigmatic. Here we show that a shoot-derived micro RNA, miR2111, systemically steers lateral root initiation and nitrogen responsiveness through its root target TML (TOO MUCH LOVE) in the legume Lotus japonicus, where miR2111 and TML were previously shown to regulate symbiotic infections with nitrogen fixing bacteria. Intriguingly, systemic control of lateral root initiation by miR2111 and TML/HOLT (HOMOLOGUE OF LEGUME TML) was conserved in the nonsymbiotic ruderal Arabidopsis thaliana, which follows a distinct ecological strategy. Thus, the miR2111-TML/HOLT regulon emerges as an essential, conserved factor in adaptive shoot control of root architecture in dicots.

Date: 2023
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DOI: 10.1038/s41467-023-43738-6

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