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Plant phosphorus acquisition in a common mycorrhizal network: regulation of phosphate transporter genes of the Pht1 family in sorghum and flax
Author(s) -
Walder Florian,
Brulé Daphnée,
Koegel Sally,
Wiemken Andres,
Boller Thomas,
Courty PierreEmmanuel
Publication year - 2015
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.13292
Subject(s) - linum , sorghum , phosphorus , transporter , biology , phosphate , gene , plant physiology , function (biology) , botany , gene expression , pi , microbiology and biotechnology , biochemistry , chemistry , ecology , organic chemistry
Summary In a preceding microcosm study, we found huge differences in phosphorus (P) acquisition in sorghum ( Sorghum bicolor ) and flax ( Linum usitatissimum ) sharing a common mycorrhizal network ( CMN ). Is the transcriptional regulation of arbuscular mycorrhizal ( AM )‐induced inorganic orthophosphate (Pi) transporters responsible for these differences? We characterized and analyzed the expression of Pi transporters of the Pht1 family in both plant species, and identified two new AM ‐inducible Pi transporters in flax. Mycorrhizal Pi acquisition was strongly affected by the combination of plant and AM fungal species. A corresponding change in the expression of two AM ‐inducible Pht1 transporters was noticed in both plants ( Sb PT 9 , Sb PT 10 , Lu PT 5 and Lu PT 8 ), but the effect was very weak. Overall, the expression level of these genes did not explain why flax took up more Pi from the CMN than did sorghum. The post‐transcriptional regulation of the transporters and their biochemical properties may be more important for their function than the fine‐tuning of their gene expression.