The host-range specificity pairing specific legumes with specific rhizobia involves the transcriptional inactivation of the bacterial nod genes through the secretion of specific ___________ by the plant.

Question

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The plant secretes specific flavonoids that result in the transcriptional inactivation of the bacterial nod genes, leading to specificity in host-range pairing between legumes and rhizobia. Nod factors are actually produced by the rhizobia and play a role in the nodulation process, but not in determining host-range specificity. Luteolins and genisteins are both types of flavonoids that can be secreted by legumes, but they are not the ones responsible for nod gene inactivation. Lactones are not involved in this process at all.

The Host-Range Specificity Pairing Specific Legumes with Specific Rhizobia Involves