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Review
. 2023 Sep;239(6):2113-2125.
doi: 10.1111/nph.19098. Epub 2023 Jun 21.

Forging a symbiosis: transition metal delivery in symbiotic nitrogen fixation

Manuel González-Guerrero  1   2 , Cristina Navarro-Gómez  1 , Elena Rosa-Núñez  1 , Carlos Echávarri-Erasun  1   2 , Juan Imperial  1 , Viviana Escudero  1
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Free article
Review

Forging a symbiosis: transition metal delivery in symbiotic nitrogen fixation

Manuel González-Guerrero et al. New Phytol. 2023 Sep.
Free article

Abstract

Symbiotic nitrogen fixation carried out by the interaction between legumes and rhizobia is the main source of nitrogen in natural ecosystems and in sustainable agriculture. For the symbiosis to be viable, nutrient exchange between the partners is essential. Transition metals are among the nutrients delivered to the nitrogen-fixing bacteria within the legume root nodule cells. These elements are used as cofactors for many of the enzymes controlling nodule development and function, including nitrogenase, the only known enzyme able to convert N2 into NH3 . In this review, we discuss the current knowledge on how iron, zinc, copper, and molybdenum reach the nodules, how they are delivered to nodule cells, and how they are transferred to nitrogen-fixing bacteria within.

Keywords: legumes; metal homeostasis; metal transporter; nitrogen fixation; nodules.

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References

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