Publications - Molecular Signal Processing
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Müller, J.; Toev, T.; Heisters, M.; Teller, J.; Moore, K.; Hause, G.; Dinesh, D.; Bürstenbinder, K.; Abel, S.; Iron-Dependent Callose Deposition Adjusts Root Meristem Maintenance to Phosphate Availability Dev. Cell 33, 216-230, (2015) DOI: 10.1016/j.devcel.2015.02.007
Plant root development is informed by numerous edaphic cues. Phosphate (Pi) availability impacts the root system architecture by adjusting meristem activity. However, the sensory mechanisms monitoring external Pi status are elusive. Two functionally interacting Arabidopsis genes, LPR1 (ferroxidase) and PDR2 (P5-type ATPase), are key players in root Pi sensing, which is modified by iron (Fe) availability. We show that the LPR1-PDR2 module facilitates, upon Pi limitation, cell-specific apoplastic Fe and callose deposition in the meristem and elongation zone of primary roots. Expression of cell-wall-targeted LPR1 determines the sites of Fe accumulation as well as callose production, which interferes with symplastic communication in the stem cell niche, as demonstrated by impaired SHORT-ROOT movement. Antagonistic interactions of Pi and Fe availability control primary root growth via meristem-specific callose formation, likely triggered by LPR1-dependent redox signaling. Our results link callose-regulated cell-to-cell signaling in root meristems to the perception of an abiotic cue.