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Rhizodeposition under drought is controlled by root growth rate and rhizosphere water content

Title data

Holz, Maire ; Zarebanadkouki, Mohsen ; Kaestner, Anders ; Kuzyakov, Yakov ; Carminati, Andrea:
Rhizodeposition under drought is controlled by root growth rate and rhizosphere water content.
In: Plant and Soil. Vol. 423 (2018) Issue 1/2 . - pp. 429-442.
ISSN 1573-5036
DOI: https://doi.org/10.1007/s11104-017-3522-4

Abstract in another language

Aims Rhizodeposition is an important energy source for soil microorganisms. It is therefore crucial to estimate the distribution of root derived carbon (C) in soil and how it changes with soil water content.MethodsWe tested how drought affects exudate distribution in the rhizosphere by coupling 14CO2 labelling of plants and phosphor imaging to estimate C allocation in roots. Rhizosphere water content was visualized by neutron radiography. A numerical model was employed to predict the exudate release and its spatiotemporal distribution along and around growing roots.ResultsDry and wet plants allocated similar amounts of 14C into roots but root elongation decreased by 48% in dry soil leading to reduced longitudinal rhizosphere extension. Rhizosphere water content was identical (31%) independent of drought, presumably because of the high water retention by mucilage. The model predicted that the increase in rhizosphere water content will enhance diffusion of exudates especially in dry soil and increase their microbial decomposition.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER150060
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Physics > Chair Soil Physics - Univ.-Prof. Dr. Andrea Carminati
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 26 Mar 2019 08:57
Last Modified: 26 Mar 2019 08:57
URI: https://eref.uni-bayreuth.de/id/eprint/48187