Answer:
Steps in Nodule Formation Nodule formation involves a
sequence of multiple interactions between Rhizobium and roots of the host
plant. Principal stages in the nodule formation are:
(i) Rhizobia multiply and colonise the surroundings
of roots and get attached to epidermal and root hair cells.
(ii) The root-hairs curl and the bacteria invade the
root-hair.
(iii) An infection thread is produced carrying the
bacteria into the cortex Of the root, where they initiate the nodule formation
in the cortex of the root. Then the bacteria are released from the thread into
the cells which leads to the differentiation of specialized nitrogen fixing
cells.
(iv) The nodule thus formed, establishes a direct
vascular connection with the host for exchange of nutrients.
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