Iron Availability Affects Phosphate Deficiency-Mediated Responses, and Evidence of Cross-Talk with Auxin and Zinc in Arabidopsis

Plant & Cell Physiology
Vandna RaiAjay Jain

Abstract

Phosphate (Pi) is pivotal for plant growth and development. Pi deficiency triggers local and systemically regulated adaptive responses in Arabidopsis thaliana. Inhibition of primary root growth (PRG) and retarded development of lateral roots (LRs) are typical local Pi deficiency-mediated responses of the root system. Expression of Pi starvation-responsive (PSR) genes is regulated systemically. Here, we report the differential influence of iron (Fe) availability on local and systemic sensing of Pi by Arabidopsis. P-Fe- condition disrupted local Pi sensing, resulting in an elongated primary root (PR). Altered Fe homeostasis in the lpsi mutant with aberration in local Pi sensing provided circumstantial evidence towards the role of Fe in the maintenance of Pi homeostasis. Reporter gene assays, expression analysis of auxin-responsive genes (ARGs) and root phenotyping of the arf7arf19 mutant demonstrated the role of Fe availability on local Pi deficiency-mediated LR development. In addition, Fe availability also exerted a significant influence on PSR genes belonging to different functional categories. Together, these results demonstrated a substantial influence of Fe availability on Pi deficiency-mediated responses of ontogenetically...Continue Reading

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Dec 1, 2015·Frontiers in Plant Science·Ajit P SinghJitender Giri
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Apr 17, 2020·Genomics·Jo-Wei Allison HsiehPao-Yang Chen
May 28, 2021·Frontiers in Plant Science·Suresh KumarTrilochan Mohapatra
Mar 27, 2021·Plant Physiology·Pierre-Mathieu PélissierTom Beeckman
Nov 3, 2021·Journal of Experimental Botany·Rouhallah SharifiChoong-Min Ryu

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