Q. The pigment that gives a pinkish colour to rhizobium induced root nodules
Solution:
- Leghemoglobin is a heme-containing protein.
- It is responsible for carrying oxygen in the root nodules of soybean, alfalfa, and other nitrogen-fixing plants.
- Biologically, soybean leghemoglobin works in a symbiotic relationship and provides soil bacteria with oxygen.
- The presence of oxygen in the root nodules would reduce the activity of the oxygen-sensitive nitrogenase, which is an enzyme responsible for the fixation of atmospheric nitrogen.
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