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

Summarize the mechanism by which associations with bacteria supply nitrogen to plants such as legumes.

Summary Introduction

To review:

Association of plants, such as, legumes with bacteria help supply nitrogen to the plants.


The association between bacteria and plants is a two-way process. Legumes get the nitrogen through bacteria. The host plant, in turn, provides organic molecules to the bacteria that is used for their cellular respiration. These bacteria are called as nitrogen-fixing bacteria. A large amount of nitrogen is mainly fixed by Bradyrhizobium and Rhizobium species.


There are some members of the legume family, such as alfalfa, beans, alders, peas, and clover that stays in the root nodules. This is seen as swellings on the roots. The bacteria release NH4+ that is utilized by the plants to produce nitrogenous molecules and proteins.

According to research, a specific type of bacteria makes colonies on a specific legume species. Legumes and bacteria, both, are attached to each other because of the chemical secreted by roots, which is flavonoid...

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