How do you think plants that have associations with nitrogen-fixing bacteria might be uniquely useful in agriculture or gardening? How do you think plants that have associations with nitrogen-fixing bacteria might affect revegetation efforts in disturbed areas? Consider invasive species. The unique characteristics of each invasive species determine the kinds of effects that each invasive species might have on the community and the ecosystem. What kinds of effects on the plant community might you expect if an invasive plant has an association with a nitrogen fixer? Can you think of any other areas in which nitrogen-fixers might be particularly important? Explain.
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This reduces the need for synthetic fertilizers, which can be costly and harmful to the environment. By using nitrogen-fixing plants in agriculture or gardening, soil fertility can be improved naturally and sustainably. Show more…
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How does nitrogen fixation lead to enhanced plant growth? Nitrogen fixation prevents pathogens from infecting the plant. Nitrogen fixation directly by the plant is very expensive in terms of metabolic energy. Nitrogen fixation prevents herbivores from eating the plant. Fixed nitrogen can be used by plants to produce protein. Nitrogen fixation enables prokaryotes to supply the plant with proteins directly.
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Identify three beneficial results of symbiotic nitrogen fixation. a. Plants benefit from an endless supply of nitrogen; soils benefit from being naturally fertilized; and bacteria benefit from using potassium from plants. b. Plants benefit from a limited supply of nitrogen; soils benefit from being naturally fertilized, and bacteria benefit from using photosynthates from plants. c. Plants benefit from an endless supply of carbon; soils benefit from being naturally fertilized; and bacteria benefit from using photosynthates from plants. d. Plants benefit from an endless supply of nitrogen; soils benefit from being naturally fertilized; and bacteria benefit from using photosynthates from plants.
How might transgenic technology (see chapter 7 ) be used to endow plants with the ability to fix nitrogen without the aid of bacteria? In what ways would this new feature change agriculture?
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