These nitrogen-fixing prokaryotes provide nitrogen fertilizer in rice paddies; they live symbiotically in the cells of the freshwater plant Azolla.

검증된 단계별 안내

Identify the key characteristics described: nitrogen-fixing prokaryotes that provide nitrogen fertilizer in rice paddies and live symbiotically inside the freshwater plant Azolla.

Recall that nitrogen-fixing prokaryotes convert atmospheric nitrogen (N\_2) into ammonia (NH\_3), which plants can use for growth, a process called biological nitrogen fixation.

Consider the types of nitrogen-fixing bacteria associated with aquatic plants, especially those forming symbiotic relationships inside plant cells.

Recognize that the genus Anabaena, a filamentous cyanobacterium, is known for living symbiotically within Azolla and fixing nitrogen in rice paddies.

Conclude that the nitrogen-fixing prokaryotes described are cyanobacteria of the genus Anabaena, which provide nitrogen fertilizer through their symbiotic relationship with Azolla.

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주요 개념

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Nitrogen Fixation

Nitrogen fixation is the biological process where certain prokaryotes convert atmospheric nitrogen (N2) into ammonia (NH3), a form usable by plants. This process enriches soil nitrogen content, supporting plant growth, especially in nitrogen-poor environments like rice paddies.

Symbiotic Relationships in Microbiology

Symbiosis refers to a close, long-term interaction between two different species. In microbiology, some nitrogen-fixing bacteria live inside plant cells, providing essential nutrients while receiving shelter and carbohydrates, exemplifying mutualism.

Azolla and Its Nitrogen-Fixing Prokaryotes

Azolla is a freshwater fern that hosts nitrogen-fixing cyanobacteria, specifically Anabaena, within its leaf cavities. This symbiosis supplies nitrogen fertilizer naturally to rice paddies, reducing the need for chemical fertilizers.