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Hormone interactions during lateral root formation

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Abstract

Lateral root (LR) formation, the production of new roots from parent roots, is a hormone- and environmentally-regulated developmental process in higher plants. Physiological and genetic studies using Arabidopsis thaliana and other plant species have revealed the roles of several plant hormones in LR formation, particularly the role of auxin in LR initiation and primordium development, resulting in much progress toward understanding the mechanisms of auxin-mediated LR formation. However, hormone interactions during LR formation have been relatively underexamined. Recent studies have shown that the plant hormones, cytokinin and abscisic acid negatively regulate LR formation whereas brassinosteroids positively regulate LR formation. On the other hand, ethylene has positive and negative roles during LR formation. This review summarizes recent findings on hormone-regulated LR formation in higher plants, focusing on auxin as a trigger and on the other hormones in LR formation, and discusses the possible interactions among plant hormones in this developmental process.

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Acknowledgments

We wish to thank Joseph G. Dubrovsky, Yoko Okushima, the anonymous reviewer and editor for helpful comments on this manuscript. The work of our group was supported in part by a Grant-in-Aid to H.F. for Scientific Research on Priority Areas (19060006) from The Ministry of Education, Culture, Sports, Science and Technology, Japan.

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  1. Department of Biology, Graduate School of Science, Kobe University, 1-1, Rokkodai, Kobe, 657-8501, Japan

    Hidehiro Fukaki

  2. Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, 630-0101, Japan

    Masao Tasaka

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  1. Hidehiro Fukaki
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  2. Masao Tasaka
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Correspondence to Hidehiro Fukaki.

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Fukaki, H., Tasaka, M. Hormone interactions during lateral root formation. Plant Mol Biol 69, 437–449 (2009). https://doi.org/10.1007/s11103-008-9417-2

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