Leghemoglobin was once thought to provide a buffer for nodule oxygen, but recent studies show that it stores only enough oxygen to support nodule respiration for a few seconds.
Its main function is to help transport oxygen to the respiring symbiotic bacterial cells in a manner analogous to hemoglobin transporting oxygen to respiring tissues in animals.
Leghemoglobin, also known as leghaemoglobin or legoglobin is an oxygen carrier and a hemoprotein found in the nitrogen-fixing root nodules of leguminous plants. It is produced by legumes in response to the roots being infected by nitrogen-fixing bacteria, called "rhizobia". Learn more at Princeton.
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