Iron Retention in Root Hemicelluloses Causes Genotypic Variability in the Tolerance to Iron Deficiency-Induced Chlorosis in Maize

Frontiers in Plant Science
Rongli ShiNicolaus von Wirén

Abstract

Antagonistic interactions of phosphorus (P) hamper iron (Fe) acquisition by plants and can cause Fe deficiency-induced chlorosis. To determine the physiological processes underlying adverse Fe-P interactions, the maize lines B73 and Mo17, which differ in chlorosis susceptibility, were grown hydroponically at different Fe:P ratios. In the presence of P, Mo17 became more chlorotic than B73. The higher sensitivity of Mo17 to Fe deficiency was not related to Fe-P interactions in leaves but to lower Fe translocation to shoots, which coincided with a larger pool of Fe being fixed in the root apoplast of P-supplied Mo17 plants. Fractionating cell wall components from roots showed that most of the cell wall-contained P accumulated in pectin, whereas most of the Fe was bound to root hemicelluloses, revealing that co-precipitation of Fe and P in the apoplast was not responsible for Fe inactivation in roots. A negative correlation between chlorophyll index and hemicellulose-bound Fe in 85 inbred lines of the intermated maize B73 × Mo17 (IBM) population indicated that apoplastic Fe retention contributes to genotypic differences in chlorosis susceptibility of maize grown under low Fe supplies. Our study indicates that Fe retention in the he...Continue Reading

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Citations

May 21, 2020·Metallomics : Integrated Biometal Science·Massimiliano Corso, Vanesa S García de la Torre
Jun 13, 2020·Plant, Cell & Environment·Benjamin StichNicolaus von Wirén
Apr 25, 2020·International Journal of Molecular Sciences·Yuta Kawakami, Navreet K Bhullar
Nov 12, 2020·Journal of Experimental Botany·Marc HanikenneHatem Rouached
Jan 7, 2021·Journal of Integrative Plant Biology·Xiao Fang ZhuRen Fang Shen

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Methods Mentioned

BETA
transgenic
PCR
electron microscopy

Software Mentioned

Image J
SigmaPlot
Systat

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