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Low Temperature Tolerance in the Perennial Sunflower Helianthus maximiliani
Kansas State Univ, Div Biol, Manhattan, KS 66503 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Evolutionary Biology. Kansas State Univ, Div Biol, Manhattan, KS 66503 USA..
Kansas State Univ, Div Biol, Manhattan, KS 66503 USA..
Skidmore Coll, Saratoga Springs, NY 12866 USA.;Cornell Univ, Dept Ecol & Evolutionary Biol, Ithaca, NY 14850 USA..
2016 (English)In: The American midland naturalist, ISSN 0003-0031, E-ISSN 1938-4238, Vol. 175, no 1, 91-102 p.Article in journal (Refereed) PublishedText
Abstract [en]

Species distributed across diverse climate and thermal conditions represent opportune systems for studying tolerance of low temperature stress. We examined variation in cold acclimation capacity and freezing tolerance among three natural populations (Texas, Kansas, and Manitoba) of the perennial sunflower species Helianthus maximiliani, originally collected across 2134 km in central North America. Tolerance to low temperatures was evaluated through leaf electrolyte leakage assays that quantify loss of cellular electrolytes into an aqueous medium due to plasma membrane damage. Freezing tolerance was highest for plants from the northernmost latitude (Manitoba population) under both non cold-acclimated and cold-acclimated experimental conditions. Individuals from Kansas and Texas populations exhibited lower freezing tolerance compared to Manitoba but did not differ from one another. Plants from all populations retain the ability to increase freezing tolerance through the process of cold acclimation. Freezing tolerance of Manitoba x Texas F1 hybrids was statistically indistinguishable from plants from the Texas population and possible explanations for these observations are discussed. Analysis of flowering specimens from herbaria records of corresponding regional locations indicates considerable variation in flowering phenology whereby flowering occurs progressively earlier with increasing latitude. This phenological variation may provide an additional mechanism of coping with low temperature stress through temporal avoidance.

Place, publisher, year, edition, pages
2016. Vol. 175, no 1, 91-102 p.
National Category
URN: urn:nbn:se:uu:diva-298920DOI: 10.1674/amid-175-01-91-102.1ISI: 000376748900009OAI: oai:DiVA.org:uu-298920DiVA: diva2:948475
Available from: 2016-07-12 Created: 2016-07-12 Last updated: 2016-07-12Bibliographically approved

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Kawakami, Takeshi
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