NDLI: Seed heat tolerance and germination of six legume species native to a fire-prone longleaf pine forest

Content Provider	Springer Nature Link
Author	Wiggers, M. Scott Hiers, J. Kevin Barnett, Analie Boyd, Robert S. Kirkman, L. Katherine
Copyright Year	2016
Abstract	Recognition of spatial heterogeneity of fire at fine scales is emerging, particularly in ecosystems characterized by frequent, low-intensity fire regimes. Differences in heat flux associated with variation in fuel and moisture conditions create microsites that affect survivorship and establishment of species. We studied the mechanisms by which fire affects seed germination using exposure of seeds to fire surrogates (moist and dry heat). Tolerance (survival) and germination responses of six perennial, herbaceous legume species common to the fire-prone longleaf pine–wiregrass ecosystem of the southeastern USA were examined the following heat treatments. Moist heat was more effective in stimulating germination than dry heat flux for most species examined. We also compared intrinsic seed properties (relative seed coat hardness, percent moisture, and seed mass) among species relative to their heat tolerance and heat-stimulated germination responses. Seed coat hardness was closely associated with the probability of dry and moist heat-stimulated germination. Variation among species in optimal germination conditions and degree of heat tolerance likely reflects selection for specific microsites among a potentially diverse suite of conditions associated with a low-intensity fire regime. Fire-stimulated germination, coupled with characteristics of seed dormancy and longevity in the soil, likely fosters favorable recruitment opportunities in restoration situations aimed at reintroducing a frequently prescribed burn regime to a relict longleaf pine site. In a restoration context in which externally available seed pool inputs are limited, this regenerative mechanism may provide a significant source of recruitment for vegetative recovery in a post-fire landscape.
Starting Page	151
Ending Page	171
Page Count	21
File Format	PDF
ISSN	13850237
Journal	Plant Ecology
Volume Number	218
Issue Number	2
e-ISSN	15735052
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-11-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fabaceae Hard seed coat Heat-stimulated germination Longleaf pine ecosystem Seed dormancy Seed survival Ecology Plant Ecology Community & Population Ecology Terrestial Ecology Applied Ecology Biodiversity
Content Type	Text
Resource Type	Article
Subject	Ecology Plant Science

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