Microhabitat and ectomycorrhizal effects on the establishment, growth and survival of Quercus ilex L. seedlings under drought.
Journal
PloS one
ISSN: 1932-6203
Titre abrégé: PLoS One
Pays: United States
ID NLM: 101285081
Informations de publication
Date de publication:
2020
2020
Historique:
received:
14
02
2020
accepted:
17
05
2020
entrez:
6
6
2020
pubmed:
6
6
2020
medline:
22
8
2020
Statut:
epublish
Résumé
The success of tree recruitment in Mediterranean holm oak (Quercus ilex) forests is threatened by the increasing intensity, duration and frequency of drought periods. Seedling germination and growth are modulated by complex interactions between abiotic (microhabitat conditions) and biotic factors (mycorrhiza association) that may mitigate the impacts of climate change on tree recruitment. To better understand and anticipate these effects, we conducted a germination experiment in a long-term precipitation reduction (PR) field experiment where we monitored seedling establishment and survival, micro-habitat conditions and ectomycorrhizal (ECM) colonization by different mycelia exploration types during the first year of seedling growth. We hypothesized that (i) the PR treatment decreases seedling survival relative to the control with ambient conditions, (ii) microhabitat conditions of water and light availability are better predictors of seedling survival than the PR treatment, (iii) the PR treatment will favour the development of ECM exploration types with drought-resistance traits such as differentiated rhizomorphs. Contrary to our first hypothesis, seedling survival was lower in control plots with overall higher soil moisture. Micro-habitat light and soil moisture conditions were better predictors of seedling survival and growth than the plot-level PR treatment, confirming our second hypothesis. Furthermore, in line with our third hypothesis, we found that ECM with longer extramatrical mycelia were more abundant in the PR treatment plots and were positively correlated to survival, which suggests a potential role of this ECM exploration type in seedling survival and recruitment. Although summer drought was the main cause of seedling mortality, our study indicates that drier conditions in spring can increase seedling survival, presumably through a synergistic effect of drought adapted ECM species and less favourable conditions for root pathogens.
Identifiants
pubmed: 32502167
doi: 10.1371/journal.pone.0229807
pii: PONE-D-20-04357
pmc: PMC7274372
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
e0229807Déclaration de conflit d'intérêts
The authors have declared that no competing interests exist.
Références
Am J Bot. 2007 Nov;94(11):1795-803
pubmed: 21636374
Sci Rep. 2019 Mar 29;9(1):5315
pubmed: 30926869
Ann Bot. 2016 Jan;117(1):165-76
pubmed: 26420203
New Phytol. 2019 Aug;223(3):1267-1279
pubmed: 31006128
Oecologia. 2012 Jul;169(3):833-44
pubmed: 22218941
Nat Ecol Evol. 2018 Feb;2(2):279-287
pubmed: 29335575
Mycorrhiza. 2007 Sep;17(6):547-550
pubmed: 17308933
FEMS Microbiol Ecol. 2009 Apr;68(1):14-24
pubmed: 19175678
New Phytol. 2006;170(2):381-90
pubmed: 16608462
Oecologia. 2003 Jan;134(1):55-64
pubmed: 12647179
Mycorrhiza. 2011 Feb;21(2):71-90
pubmed: 21140277
Annu Rev Phytopathol. 2006;44:489-509
pubmed: 16722808
Ecology. 2010 Oct;91(10):3057-68
pubmed: 21058565
Science. 2014 Nov 28;346(6213):1256688
pubmed: 25430773
Mycorrhiza. 2009 Nov;20(1):25-38
pubmed: 19517140
Proc Natl Acad Sci U S A. 2011 Jan 25;108(4):1474-8
pubmed: 21220333