Savanna Tree Seedlings are Physiologically Tolerant to Nighttime Freeze Events

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dc.contributor.author O'Keefe, K.
dc.contributor.author Nippert, Jesse B.
dc.contributor.author Swemmer, A. M.
dc.date.accessioned 2016-09-20T14:53:46Z
dc.date.available 2016-09-20T14:53:46Z
dc.identifier.uri http://hdl.handle.net/2097/33961
dc.description Citation: O'Keefe, K., Nippert, J. B., & Swemmer, A. M. (2016). Savanna Tree Seedlings are Physiologically Tolerant to Nighttime Freeze Events. Frontiers in Plant Science, 7, 13. doi:10.3389/fpls.2016.00046
dc.description.abstract Freeze events can be important disturbances in savanna ecosystems, yet the interactive effect of freezing with other environmental drivers on plant functioning is unknown. Here, we investigated physiological responses of South African tree seedlings to interactions of water availability and freezing temperatures. We grew widely distributed South African tree species (Colophospermum mopane, Combretum apiculaturn, Acacia nigrescens, and Cassia abbreviate) under well watered and water-limited conditions and exposed individuals to nighttime freeze events. Of the four species studied here, C. mopane was the most tolerant of lower water availability. However, all species were similarly tolerant to nighttime freezing and recovered within one week following the last freezing event. We also show that water limitation somewhat increased freezing tolerance in one of the species (C. mopane). Therefore, water limitation, but not freezing temperatures, may restrict the distribution of these species, although the interactions of these stressors may have species specific impacts on plant physiology. Ultimately, we show that unique physiologies can exist among dominant species within communities and that combined stresses may play a currently unidentified role in driving the function of certain species within southern Africa.
dc.relation.uri https://doi.org/10.3389/fpls.2016.00046
dc.rights Attribution 4.0 International (CC BY 4.0)
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Freezing
dc.subject Drought
dc.subject Savanna
dc.subject Hydraulic Conductivity
dc.subject Gas Exchange
dc.subject Stem Water Transport
dc.title Savanna Tree Seedlings are Physiologically Tolerant to Nighttime Freeze Events
dc.type Article
dc.date.published 2016
dc.citation.doi 10.3389/fpls.2016.00046
dc.citation.issn 1664-462X
dc.citation.jtitle Frontiers in Plant Science
dc.citation.spage 13
dc.citation.volume 7
dc.contributor.authoreid nippert


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