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Modulating Phytohormone Levels

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Beneficial Plant-Bacterial Interactions

Abstract

Most, if not all, of the physiological activity of a plant is regulated by one or more plant hormones (phytohormones) including auxin, cytokinin, gibberellin, abscisic acid, ethylene, salicylic acid, jasmonic acid, and brassinosteroids. In addition to plants, many soil bacteria are also capable of synthesizing and/or modulating the level of some of these hormones including auxin, cytokinin, gibberellin, and ethylene (Fig. 3.1). It should be emphasized here that phytohormones are not nutrients, but rather are chemicals that are typically present in plants in very low concentrations and promote and influence the growth, development, and differentiation of plant cells and tissues. Phytohormones help plants to adjust their growth rates and patterns in response to a wide range of environmental and developmental conditions. By modulating different aspects of a plant’s environmental and developmental responses, phytohormones turn on (or off) various plant genes that ultimately help to optimize a plant’s growth and development.

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Authors and Affiliations

  1. Department of Biology, University of Waterloo, Waterloo, ON, Canada

    Bernard R. Glick

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Correspondence to Bernard R. Glick .

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Glick, B.R. (2015). Modulating Phytohormone Levels. In: Beneficial Plant-Bacterial Interactions. Springer, Cham. https://doi.org/10.1007/978-3-319-13921-0_3

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