Natural allelic variation of FRO2 modulates Arabidopsis root growth under iron deficiency

Santosh B. Satbhai, Claudia Setzer, Florentina Freynschlag, Radka Slovak, Envel Kerdaffrec and Wolfgang Busch ()
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Santosh B. Satbhai: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)
Claudia Setzer: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)
Florentina Freynschlag: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)
Radka Slovak: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)
Envel Kerdaffrec: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)
Wolfgang Busch: Gregor Mendel Institute (GMI), Austrian Academy of Sciences, Vienna Biocenter (VBC)

Nature Communications, 2017, vol. 8, issue 1, 1-10

Abstract: Abstract Low availability of Fe significantly limits crop yields in many parts of the world. However, it is largely unknown which genes and alleles adjust plant growth in Fe limited environments. Using natural variation of a geographically restricted panel of Arabidopsis thaliana accessions, we identify allelic variation at the FRO2 locus associated with root length under iron deficiency. We show that non-coding sequence variation at the FRO2 locus leads to variation of FRO2 transcript levels, as well as ferric chelate reductase activity, and is causal for a portion of the observed root length variation. These FRO2 allele dependent differences are coupled with altered seedling phenotypes grown on iron-limited soil. Overall, we show that these natural genetic variants of FRO2 tune its expression. These variants might be useful for improvement of agronomically relevant species under specific environmental conditions, such as in podzols or calcareous soils.

Date: 2017
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DOI: 10.1038/ncomms15603

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