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Lateral Root versus Nodule: The Auxin-Cytokinin Interplay

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Abstract

Nodules are formed as a result of symbiosis with nitrogen-fixing bacteria on the roots of legume plants. Symbiotic nodule development shares common developmental processes with lateral roots, including cell proliferation of the pericycle and cortical cell layers leading to primordium formation, and both these organs are assumed to be evolutionarily related. The progression of their development is realized with the help of phytohormones, in particular auxin and cytokinin. Due to common evolutionary origin, the hormonal pathway and response may have similar functionality in cell fate specification during lateral root and nodule development. It is known that auxin and cytokinin both positively regulate nodule primordia development. However during lateral root development, auxin is a key positive regulator, while cytokinin suppresses lateral root development. Therefore, a comparative review of auxin and cytokinin action in the development of these two organs to elucidate how their identity is established should be of special interest. This review discusses the involvement of auxin and cytokinin in the development of symbiotic nodules and lateral roots, with a special focus on the similarity and differences of their action during lateral root and nodule developmental processes. The spatio-temporal peculiarities of auxin and cytokinin biosynthesis, transport and response during lateral root and symbiotic nodule formation are reviewed, which should help to clarify how the identity of these two root lateral organs depends on auxin-cytokinin interplay.

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Funding

This work was supported by the Center for International Scientific Studies & Collaborations (CISSC), Ministry of Science Research and Technology of Iran, and Saint-Petersburg State University Grant ID: 93020341 provided to Maria Lebedeva.

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The conceptualization of the theme, literature search and data analysis, original draft preparation: MA; review and editing: MA and ML. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Mahboobeh Azarakhsh.

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The authors declare no conflict of interest.

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Handling Editor: Francesca Resentini.

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Azarakhsh, M., Lebedeva, M.A. Lateral Root versus Nodule: The Auxin-Cytokinin Interplay. J Plant Growth Regul 42, 6903–6919 (2023). https://doi.org/10.1007/s00344-023-10983-4

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  • DOI: https://doi.org/10.1007/s00344-023-10983-4

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