Mechanism and function of root circumnutation.

Journal Article (Journal Article)

Early root growth is critical for plant establishment and survival. We have identified a molecular pathway required for helical root tip movement known as circumnutation. Here, we report a multiscale investigation of the regulation and function of this phenomenon. We identify key cell signaling events comprising interaction of the ethylene, cytokinin, and auxin hormone signaling pathways. We identify the gene Oryza sativa histidine kinase-1 (HK1 ) as well as the auxin influx carrier gene OsAUX1 as essential regulators of this process in rice. Robophysical modeling and growth challenge experiments indicate circumnutation is critical for seedling establishment in rocky soil, consistent with the long-standing hypothesis that root circumnutation facilitates growth past obstacles. Thus, the integration of robotics, physics, and biology has elucidated the functional importance of root circumnutation and uncovered the molecular mechanisms underlying its regulation.

Full Text

Duke Authors

Cited Authors

  • Taylor, I; Lehner, K; McCaskey, E; Nirmal, N; Ozkan-Aydin, Y; Murray-Cooper, M; Jain, R; Hawkes, EW; Ronald, PC; Goldman, DI; Benfey, PN

Published Date

  • February 2021

Published In

Volume / Issue

  • 118 / 8

PubMed ID

  • 33608460

Pubmed Central ID

  • PMC7923379

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.2018940118

Language

  • eng