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Steiner, F.A.* ; Wild, A.J.* ; Tyborski, N.* ; Tung, S.Y.* ; Koehler, T.* ; Buegger, F. ; Carminati, A.* ; Eder, B.* ; Groth, J.* ; Hesse, B.D.* ; Pausch, J.* ; Lüders, T.* ; Vahl, W.K.* ; Wolfrum, S.* ; Mueller, C.W.* ; Vidal, A.*

Rhizosheath drought responsiveness is variety-specific and a key component of belowground plant adaptation.

New Phytol. 242, 479-492 (2024)

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Biophysicochemical rhizosheath properties play a vital role in plant drought adaptation. However, their integration into the framework of plant drought response is hampered by incomplete mechanistic understanding of their drought responsiveness and unknown linkage to intraspecific plant-soil drought reactions. Thirty-eight Zea mays varieties were grown under well-watered and drought conditions to assess the drought responsiveness of rhizosheath properties, such as soil aggregation, rhizosheath mass, net-rhizodeposition, and soil organic carbon distribution. Additionally, explanatory traits, including functional plant trait adaptations and changes in soil enzyme activities, were measured. Drought restricted soil structure formation in the rhizosheath and shifted plant-carbon from litter-derived organic matter in macroaggregates to microbially processed compounds in microaggregates. Variety-specific functional trait modifications determined variations in rhizosheath drought responsiveness. Drought responses of the plant-soil system ranged among varieties from maintaining plant-microbial interactions in the rhizosheath through accumulation of rhizodeposits, to preserving rhizosheath soil structure while increasing soil exploration through enhanced root elongation. Drought-induced alterations at the root-soil interface may hold crucial implications for ecosystem resilience in a changing climate. Our findings highlight that rhizosheath soil properties are an intrinsic component of plant drought response, emphasizing the need for a holistic concept of plant-soil systems in future research on plant drought adaptation.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Crop ; Maize ; Rhizodeposition ; Rhizosphere ; Soil Aggregation ; Soil Organic Carbon ; Soil Structure ; Water Scarcity; Root Mucilage; Soil Aggregation; R Package; Rhizosphere; Water; Carbon; Rhizodeposition; Consequences; Sensitivity; Exudation

ISSN (print) / ISBN 0028-646X

e-ISSN 1469-8137

Journal New Phytologist

Quellenangaben Volume: 242, Issue: 2, Pages: 479-492

Publisher Wiley

Publishing Place 111 River St, Hoboken 07030-5774, Nj Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Environmental Simulation (BIOP-EUS)

Grants Projekt DEAL
Statistical Consulting at TUM
German Bundesministerium fur Bildung und Forschung within the collaborative project 'Rhizo4Bio (Phase 1): RhizoTraits - Rhizospharen-Merkmale erhohen die Resilienz der Ertrage in modernen Anbausystemen, TP B'