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The H+-ATPase HA1 of Medicago truncatula Is Essential for Phosphate Transport and Plant Growth during Arbuscular Mycorrhizal Symbiosis
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 2683632
Author(s) Krajinski, Franziska; Courty, Pierre-Emmanuel; Sieh, Daniela; Franken, Philipp; Zhang, Haoqiang; Bucher, Marcel; Gerlach, Nina; Kryvoruchko, Igor; Zoeller, Daniela; Udvardi, Michael; Hause, Bettina
Author(s) at UniBasel Boller, Thomas
Courty, Pierre-Emmanuel
Year 2014
Title The H+-ATPase HA1 of Medicago truncatula Is Essential for Phosphate Transport and Plant Growth during Arbuscular Mycorrhizal Symbiosis
Journal The plant cell
Volume 26
Number 4
Pages / Article-Number 1808-1817
Abstract

A key feature of arbuscular mycorrhizal symbiosis is improved phosphorus nutrition of the host plant via the mycorrhizal pathway, i.e., the fungal uptake of Pi from the soil and its release from arbuscules within root cells. Efficient transport of Pi from the fungus to plant cells is thought to require a proton gradient across the periarbuscular membrane (PAM) that separates fungal arbuscules from the host cell cytoplasm. Previous studies showed that the H+-ATPase gene HA1 is expressed specifically in arbuscule containing root cells of Medicago truncatula. We isolated a ha1-2 mutant of M. truncatula and found it to be impaired in the development of arbuscules but not in root colonization by Rhizophagus irregularis hyphae. Artificial microRNA silencing of HA1 recapitulated this phenotype, resulting in small and truncated arbuscules. Unlike the wild type, the ha1-2 mutant failed to show a positive growth response to mycorrhizal colonization under Pi-limiting conditions. Uptake experiments confirmed that ha1-2 mutants are unable to take up phosphate via the mycorrhizal pathway. Increased pH in the apoplast of abnormal arbuscule containing cells of the ha1-2 mutant compared with the wild type suggests that HA1 is crucial for building a proton gradient across the PAM and therefore is indispensible for the transfer of Pi from the fungus to the plant.

Publisher American Society of Plant Biologists
ISSN/ISBN 1040-4651
edoc-URL http://edoc.unibas.ch/dok/A6289116
Full Text on edoc No
Digital Object Identifier DOI 10.1105/tpc.113.120436
ISI-Number WOS:000337351300031
Document type (ISI) Article
 
   

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