Question
What are the steps involved in formation of a root nodule?
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Answer
Steps in the development of root nodules:
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Rhizobium bacteria contact a susceptible root hair and divide near it.
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The bacteria cause root hair to curl on successful infection.
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An infected thread carries the bacteria to the inner cortex. The bacteria get modified into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide. Division and growth of cortical and pericycle cells lead to nodule formation.
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A mature nodule is complete with vascular tissues continuous with those of the root.
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