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

Give examples of how some hormones have both promotingand inhibiting effects on growth in different parts of the plant atdifferent times of the life cycle.

Summary Introduction

To review:

The growth inhibiting and promoting functions of some hormones in different plant parts at different times of their life cycle, with the help of examples.


Plant hormones are the small molecules that regulate their growth, senescence, and flowering. The plant hormones are commonly called phytochromes. Some plant hormones like auxin help in the growth of plant parts and some like ethylene inhibit their growth. The other hormones play various roles in the regulation of plant growth and survival.


Ethylene is a hormone that regulates the senescence as well as the growth of the plant parts at different time intervals. Ethylene is a small gaseous molecule that is produced by every part of the flowering plant. It leads to the leaf shedding, fruit ripening and response to abiotic and biotic stresses, especially in case of mature deciduous plants. The senescence is promoted by activation of enzymes, which helps in digestion of the cell walls...

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