Signal transduction pathways mediate hormone and photoreceptor action

We introduced the topic of signal transduction pathways in Chapter 15. Plants, like other organisms, make extensive use of these pathways. Cell signaling in plant development involves three steps: a receptor (for a hormone or for light), a signal transduction pathway, and the ultimate cellular response (see Figure 15.2). Protein kinase cascades amplify responses to signals in plants, as they do in other organisms (see Figure 15.9). The signal transduction pathways of plants differ from those of animals only in the details; for example, protein kinases in plants phosphorylate the amino acids serine or threonine, but not tyrosine.

Before concerning ourselves with molecular details, however, let's look at the general pattern of plant development.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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