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2014 ; 114
(3
): 579-90
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Humidity-regulated dormancy onset in the Fabaceae: a conceptual model and its
ecological implications for the Australian wattle Acacia saligna
#MMPMID25015069
Tozer MG
; Ooi MK
Ann Bot
2014[Sep]; 114
(3
): 579-90
PMID25015069
show ga
BACKGROUND AND AIMS: Seed dormancy enhances fitness by preventing seeds from
germinating when the probability of seedling survival and recruitment is low. The
onset of physical dormancy is sensitive to humidity during ripening; however, the
implications of this mechanism for seed bank dynamics have not been quantified.
This study proposes a model that describes how humidity-regulated dormancy onset
may control the accumulation of a dormant seed bank, and seed experiments are
conducted to calibrate the model for an Australian Fabaceae, Acacia saligna. The
model is used to investigate the impact of climate on seed dormancy and to
forecast the ecological implications of human-induced climate change. METHODS:
The relationship between relative humidity and dormancy onset was quantified
under laboratory conditions by exposing freshly matured non-dormant seeds to
constant humidity levels for fixed durations. The model was field-calibrated by
measuring the response of seeds exposed to naturally fluctuating humidity. The
model was applied to 3-hourly records of humidity spanning the period 1972-2007
in order to estimate both temporal variability in dormancy and spatial
variability attributable to climatic differences among populations. Climate
change models were used to project future changes in dormancy onset. KEY RESULTS:
A sigmoidal relationship exists between dormancy and humidity under both
laboratory and field conditions. Seeds ripened under field conditions became
dormant following very short exposure to low humidity (<20 %). Prolonged exposure
at higher humidity did not increase dormancy significantly. It is predicted that
populations growing in a temperate climate produce 33-55 % fewer dormant seeds
than those in a Mediterranean climate; however, dormancy in temperate populations
is predicted to increase as a result of climate change. CONCLUSIONS:
Humidity-regulated dormancy onset may explain observed variation in physical
dormancy. The model offers a systematic approach to modelling this variation in
population studies. Forecast changes in climate have the potential to alter the
seed bank dynamics of species with physical dormancy regulated by this mechanism,
with implications for their capacity to delay germination and exploit windows for
recruitment.