Routes to roots direct evidence of water transport by arbuscular mycorrhizal fungi to host plants

Routes to roots : direct evidence of water transport by arbuscular mycorrhizal fungi to host plants

© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 236(2022), 1 vom: 01. Okt., Seite 210-221
1. Verfasser: Kakouridis, Anne (VerfasserIn)
Weitere Verfasser: Hagen, John A, Kan, Megan P, Mambelli, Stefania, Feldman, Lewis J, Herman, Donald J, Weber, Peter K, Pett-Ridge, Jennifer, Firestone, Mary K
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Rhizophagus intraradices arbuscular mycorrhizal fungi fluorescence microscopy hyphal transport nutrient transport plant-microbe interactions plant-water relations mehr... stable isotopes Fluorescent Dyes
Beschreibung
Zusammenfassung:© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.
Arbuscular mycorrhizal fungi (AMF) can help mitigate plant responses to water stress, but it is unclear whether AMF do so by indirect mechanisms, direct water transport to roots, or a combination of the two. Here, we investigated if and how the AMF Rhizophagus intraradices transported water to the host plant Avena barbata, wild oat. We used two-compartment microcosms, isotopically labeled water, and a fluorescent dye to directly track and quantify water transport by AMF across an air gap to host plants. Plants grown with AMF that had access to a physically separated compartment containing 18 O-labeled water transpired almost twice as much as plants with AMF excluded from that compartment. Using an isotopic mixing model, we estimated that water transported by AMF across the air gap accounted for 34.6% of the water transpired by host plants. In addition, a fluorescent dye indicated that hyphae were able to transport some water via an extracytoplasmic pathway. Our study provides direct evidence that AMF can act as extensions of the root system along the soil-plant-air continuum of water movement, with plant transpiration driving water flow along hyphae outside of the hyphal cell membrane
Beschreibung:Date Completed 09.09.2022
Date Revised 15.10.2022
published: Print-Electronic
Citation Status MEDLINE
ISSN:1469-8137
DOI:10.1111/nph.18281