Changes in root-exudate-induced respiration reveal a novel mechanism through which drought affects ecosystem carbon cycling.
carbon
climate change
drought
plant-soil interactions
root exudate
root traits
soil bacteria
soil fungi
Journal
The New phytologist
ISSN: 1469-8137
Titre abrégé: New Phytol
Pays: England
ID NLM: 9882884
Informations de publication
Date de publication:
10 2019
10 2019
Historique:
received:
17
04
2019
accepted:
02
06
2019
pubmed:
21
6
2019
medline:
6
5
2020
entrez:
21
6
2019
Statut:
ppublish
Résumé
Root exudates play an important role in ecosystem response to climate change, but the functional consequences of drought-induced changes in the quality of root exudates are unknown. Here, we addressed this knowledge gap in a unique experimental approach. We subjected two common grassland species that differ widely in their growth strategies and root systems, the grass Holcus lanatus and the forb Rumex acetosa, to 2 wk of drought. We collected root exudates and soils at the end of the drought and after 2 wk of recovery and readded all root exudates to all soils in a fully reciprocal set-up to measure root-exudate-induced respiration. We found that soil treatment was unimportant for determining root-exudate-induced respiration. By contrast, root exudates collected from plants that had experienced drought clearly triggered more soil respiration than exudates from undroughted plants. Importantly, this increased respiration compensated for the lower rates of root exudation in droughted plants. Our findings reveal a novel mechanism through which drought can continue to affect ecosystem carbon cycling, and a potential plant strategy to facilitate regrowth through stimulating microbial activity. These findings have important implications for understanding plant and ecosystem response to drought.
Identifiants
pubmed: 31218693
doi: 10.1111/nph.16001
pmc: PMC6771481
doi:
Substances chimiques
Organic Chemicals
0
Plant Exudates
0
Soil
0
Carbon
7440-44-0
Nitrogen
N762921K75
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
132-145Subventions
Organisme : Biotechnology and Biological Sciences Research Council
ID : BB/L02456X/1
Pays : United Kingdom
Informations de copyright
© 2019 The Authors. New Phytologist © 2019 New Phytologist Trust.
Références
J Ecol. 2018 May;106(3):1230-1243
pubmed: 29780173
Appl Environ Microbiol. 2003 Jun;69(6):3593-9
pubmed: 12788767
Proc Natl Acad Sci U S A. 2012 Feb 14;109(7):2666-71
pubmed: 22308426
New Phytol. 2016 May;210(3):861-74
pubmed: 26749302
Ecol Lett. 2011 Feb;14(2):187-94
pubmed: 21176050
FEMS Microbiol Rev. 2013 Sep;37(5):634-63
pubmed: 23790204
Nat Commun. 2018 Aug 2;9(1):3033
pubmed: 30072764
New Phytol. 2015 Feb;205(3):1117-1127
pubmed: 25385284
Microbiome. 2018 Dec 26;6(1):231
pubmed: 30587246
Ecol Evol. 2018 Jul 30;8(16):8573-8581
pubmed: 30250724
New Phytol. 2009 Dec;184(4):950-61
pubmed: 19843305
Nat Microbiol. 2018 Apr;3(4):470-480
pubmed: 29556109
New Phytol. 2014 Feb;201(3):916-927
pubmed: 24171922
Glob Chang Biol. 2019 Mar;25(3):1005-1015
pubmed: 30387912
Glob Chang Biol. 2014 Oct;20(10):3229-37
pubmed: 24771521
New Phytol. 2004 Sep;163(3):459-480
pubmed: 33873745
Sci Rep. 2018 Aug 23;8(1):12696
pubmed: 30140025
Trends Ecol Evol. 2014 Dec;29(12):692-9
pubmed: 25459399
Glob Chang Biol. 2014 Apr;20(4):1174-90
pubmed: 24339186
Trends Plant Sci. 2016 Mar;21(3):209-217
pubmed: 26832947
Front Microbiol. 2013 Jul 29;4:216
pubmed: 23908649
Ecol Lett. 2016 Jun;19(6):648-56
pubmed: 27074533
Front Plant Sci. 2019 Feb 21;10:157
pubmed: 30881364
Microb Ecol. 2003 May;45(4):373-83
pubmed: 12704558
Ecol Evol. 2012 Aug;2(8):1843-52
pubmed: 22957187
Front Plant Sci. 2018 Nov 07;9:1593
pubmed: 30464767