Root Nodules

Although almost 80% of our atmosphere consists of nitrogen gas, plants cannot convert the nitrogen gas to usable forms. A few species of bacteria, however, produce enzymes with which they can convert nitrogen into nitrates and other nitrogenous substances readily absorbed by roots. Members of the Legume Family (Fabaceae), which includes peas and beans, and a few other plants such as alders, form associations with certain soil bacteria that result in the production of numerous small swellings called

Stern-Jansky-Bidlack: I 5. Roots and Soils I Text I I © The McGraw-Hill

Introductory Plant Biology, Companies, 2003

Ninth Edition cortex of root epidermis cortex of root epidermis

hyphae normal — roots mycorrhizal sheath

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Essentials of Human Physiology

Essentials of Human Physiology

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