Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which plant hormones promote growth and which inhibit it?

Summary Introduction

To review:

The hormones that are necessary to inhibit and promote the growth of the plants.


The hormone is a small molecule that regulates the metabolism, growth, and development of an organism. The plant's hormones are known as phytohormones that help in their growth and survival. Seed germination, blooming of flower, maturation from vegetative to reproductive phase, and senescence are regulated by different plant hormones. The senescence is a process in which the plant’s parts die off and give way to generate new parts like leaves and flowers. Plant hormones also respond to abiotic factors like light, touch, temperature, and pressure.


Scientists have discovered several plant hormones, some of which are important for their development, while others are important for their senescence. The auxin hormones are essential for the growth of plants. They are produced in SAM (shoot apical meristems), young leaves, and stems.

The normal cell cycle of plant cells also takes place with the help of auxins. The cells of growing coleoptiles and growing stem require auxin, to get elongated. Light and gravity also affect the plant growth that is regulated by the auxin hormone.

The natural form of auxin is chemically known as IAA (indole acetic acid)...

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