Fig. 9: Proposed model for regulation of nodule organogenesis by nitrate. | Nature Communications

Fig. 9: Proposed model for regulation of nodule organogenesis by nitrate.

From: Nitrate restricts nodule organogenesis through inhibition of cytokinin biosynthesis in Lotus japonicus

Fig. 9

In low nitrate, NLP signalling contributes to regulation of symbiotic genes, which stimulate cytokinin biosynthesis, ensuring robust nodule maturation and onset of nitrogen fixation. In high nitrate, NLP-dependent nitrate signalling inhibits expression of symbiotic genes and symbiotic cytokinin biosynthesis that is crucial for nodule organogenesis. Nodulation is thus balanced between a permissive low-nitrate state where high cytokinin levels can accumulate, or a restrictive state with low root cytokinin.

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