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Malate-dependent Fe accumulation is a critical checkpoint in the root developmental response to low phosphate.

Abstract：

:Low phosphate (Pi) availability constrains plant development and seed production in both natural and agricultural ecosystems. When Pi is scarce, modifications of root system architecture (RSA) enhance the soil exploration ability of the plant and lead to an increase in Pi uptake. In Arabidopsis, an iron-dependent mechanism reprograms primary root growth in response to low Pi availability. This program is activated upon contact of the root tip with low-Pi media and induces premature cell differentiation and the arrest of mitotic activity in the root apical meristem, resulting in a short-root phenotype. However, the mechanisms that regulate the primary root response to Pi-limiting conditions remain largely unknown. Here we report on the isolation and characterization of two low-Pi insensitive mutants (lpi5 and lpi6), which have a long-root phenotype when grown in low-Pi media. Cellular, genomic, and transcriptomic analysis of low-Pi insensitive mutants revealed that the genes previously shown to underlie Arabidopsis Al tolerance via root malate exudation, known as SENSITIVE TO PROTON RHIZOTOXICITY (STOP1) and ALUMINUM ACTIVATED MALATE TRANSPORTER 1 (ALMT1), represent a critical checkpoint in the root developmental response to Pi starvation in Arabidopsis thaliana Our results also show that exogenous malate can rescue the long-root phenotype of lpi5 and lpi6 Malate exudation is required for the accumulation of Fe in the apoplast of meristematic cells, triggering the differentiation of meristematic cells in response to Pi deprivation.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Mora-Macías J,Ojeda-Rivera JO,Gutiérrez-Alanís D,Yong-Villalobos L,Oropeza-Aburto A,Raya-González J,Jiménez-Domínguez G,Chávez-Calvillo G,Rellán-Álvarez R,Herrera-Estrella L

doi

10.1073/pnas.1701952114

subject

Has Abstract

pub_date

2017-04-25 00:00:00

pages

E3563-E3572

issue

17

eissn

0027-8424

issn

1091-6490

pii

1701952114

journal_volume

114

pub_type

杂志文章

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