Long-distance signaling to control root nodule number.

Abstract excerpt

Symbiotic nitrogen fixation is beneficial to legumes. Excessive nodule development, however, disturbs the host growth by over-consuming energy from the plant. To keep a balance, legumes possess a systemic negative feedback regulatory system called 'autoregulation of nodulation', which controls the nodule number and the nodulation zone through long-distance signaling. Plants that are deficient in autoregulation...

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