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Below-ground plant-soil interactions affecting adaptations of rice to iron toxicity
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  • Guy Kirk,
  • Hanna Manwaring,
  • Yoshiaki Ueda,
  • Vimal Semwal,
  • Matthias Wissuwa
Guy Kirk
Cranfield University
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Hanna Manwaring
Cranfield University
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Yoshiaki Ueda
Japan International Research Center for Agricultural Sciences
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Vimal Semwal
AfricaRice Nigeria Station
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Matthias Wissuwa
Japan International Research Center for Agricultural Sciences
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Abstract

Iron toxicity is a major constraint to rice production, particularly in highly-weathered soils of inland valleys in sub-Saharan Africa where the rice area is rapidly expanding. Although there is wide variation in tolerance in the rice germplasm, progress in introgressing tolerance traits into high-yielding germplasm has been slow owing to the complexity of tolerance mechanisms and large genotype by environment effects. We review current understanding of tolerance mechanisms, particularly those involving below-ground plant-soil interactions, which to date have been less studied than above-ground mechanisms. We cover processes in the rhizosphere linked to exclusion of toxic ferrous iron by oxidation, and resulting effects on the mobility of nutrient ions. We also cover the molecular physiology of below-ground processes controlling Fe retention in roots and root-shoot transport, and also plant Fe sensing. We conclude that future breeding programs should be based on well-characterised molecular markers for tolerance traits. To successfully identify such markers, the complex tolerance response should be broken down into its components based on understanding of tolerance mechanisms, and tailored screening methods developed for individual mechanisms.

Peer review status:IN REVISION

10 Jun 2021Submitted to Plant, Cell & Environment
11 Jun 2021Assigned to Editor
11 Jun 2021Submission Checks Completed
11 Jun 2021Reviewer(s) Assigned
21 Jun 2021Review(s) Completed, Editorial Evaluation Pending
20 Jul 2021Editorial Decision: Revise Minor