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Nuclear calcium signatures are associated with root development.

Nuno Leitão1,2, Pierre Dangeville1, Ross Carter3

  • 1Department of Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich, NR4 7UH, UK.

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|October 27, 2019
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Nuclear calcium (Ca2+) signaling in Arabidopsis roots is crucial for primary root development and auxin homeostasis. Genetic alteration of the AtDMI1 gene impacts these Ca2+ signals and root growth.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Nuclear calcium (Ca2+) releases are vital for symbiotic interactions in plants, such as nitrogen fixation and arbuscular mycorrhizal symbiosis.
  • In legumes like Medicago truncatula, nuclear Ca2+ signals are mediated by ion channel complexes, including DOES NOT MAKE INFECTIONS 1 (DMI1) and cyclic nucleotide-gated channels (CNGC) 15s.
  • The conservation of DMI1 and CNGC15s across land plants suggests broader roles for nuclear Ca2+ signaling beyond symbiotic relationships.

Purpose of the Study:

  • To investigate the role of nuclear Ca2+ signaling in non-symbiotic processes in Arabidopsis root cells.
  • To determine the correlation between nuclear Ca2+ signals and primary root development, including meristematic activity and auxin balance.
  • To examine the impact of genetic modifications of the AtDMI1 gene on nuclear Ca2+ signatures and root development.

Main Methods:

  • Utilized Arabidopsis root cells to study nuclear Ca2+ signaling.
  • Employed genetic manipulation of the AtDMI1 gene.
  • Monitored nuclear Ca2+ signatures and assessed primary root development parameters.

Main Results:

  • Nuclear Ca2+ signaling was observed to initiate within the nucleus of Arabidopsis root cells.
  • These nuclear Ca2+ signals were found to be correlated with key aspects of primary root development, such as meristem development and auxin homeostasis.
  • Genetic alteration of AtDMI1 significantly modulated both nuclear Ca2+ signatures and primary root development.

Conclusions:

  • Nuclear Ca2+ signaling plays a significant role in Arabidopsis primary root development and auxin regulation.
  • The frequency and duration of Ca2+ signals can encode stimulus-specific information to regulate cellular functions.
  • AtDMI1 is a key component in regulating nuclear Ca2+ signaling and its downstream effects on root growth.