The risk-takers and -avoiders: germination sensitivity to water stress in an arid zone with unpredictable rainfall.
bet-hedging
cardinal temperatures
hydrotime
seed mass
seed physiology
t50
water potential
Ψ b50
Journal
AoB PLANTS
ISSN: 2041-2851
Titre abrégé: AoB Plants
Pays: England
ID NLM: 101539425
Informations de publication
Date de publication:
Dec 2019
Dec 2019
Historique:
received:
27
05
2019
accepted:
03
10
2019
entrez:
29
11
2019
pubmed:
30
11
2019
medline:
30
11
2019
Statut:
epublish
Résumé
Water availability is a critical driver of population dynamics in arid zones, and plant recruitment is typically episodic in response to rainfall. Understanding species' germination thresholds is key for conservation and restoration initiatives. Thus, we investigated the role of water availability in the germination traits of keystone species in an arid ecosystem with stochastic rainfall. We measured seed germination responses of five arid species, along gradients of temperature and water potential under controlled laboratory conditions. We then identified the cardinal temperatures and base water potentials for seed germination, and applied the hydrotime model to assess germination responses to water stress. Optimum temperatures for germination ranged from 15 to 31 °C under saturated conditions (0 MPa), and three species had low minimum temperatures for germination (<3 °C). A small proportion of seeds of all species germinated under dry conditions (Ψ ≤ -1 MPa), although base water potential for germination (Ψ
Identifiants
pubmed: 31777652
doi: 10.1093/aobpla/plz066
pii: plz066
pmc: PMC6863470
doi:
Types de publication
Journal Article
Langues
eng
Pagination
plz066Informations de copyright
© The Author(s) 2019. Published by Oxford University Press on behalf of the Annals of Botany Company.
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