Which of the growth substance acts a stimulant during nodule formation in leguminous plant?

Ethylene

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ABA

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IAA

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Morphactin

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Solution

The correct option is C IAA
Auxins are growth promoting phytohormones. Thimann, 1939, suggested that IAA is the stimulatory material for nodule formation because it is produced by Rhizobium. However, many soil microorganisms are capable of forming IAA without the production of nodule. Nodule formation appears to be a result of complex interplay between host plant and the bacterium.
Thus, the correct answer is option C.

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