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Abstract Detail

Physiology & Ecophysiology

Palacio-LĂłpez, Kattia [1], Oakley, Christopher [1].

Latitudinal and elevational patterns of freezing tolerance in a widespread annual plant.

The ability to withstand freezing temperatures is important for plants growing at high latitudes and/or high elevations. In many species, freezing tolerance requires cold acclimation, induced by exposure to sustained cold, non-freezing, temperatures. Cold acclimation is therefore an example of adaptive phenotypic plasticity in freezing climates. Such plasticity may be costly in cold (but non-freezing) climates, leading to fitness tradeoffs across environments and local adaptation. We quantified freezing tolerance following cold acclimation for 441 lines from 64 natural populations of Arabidopsis thaliana from Italy, Spain, and Scandinavia. In total, these populations spanned 38° - 67° of latitude, and 4m - 1706m of elevation. We found significant differences among regions in mean freezing tolerance, as well as 4-7-fold variation in population mean freezing tolerance within regions. Population mean freezing tolerance was significantly positively correlated with latitude in Scandinavia, and in Spain we found significant positive correlations between population mean freezing tolerance and both latitude and elevation. Population mean freezing tolerance was not correlated with either latitude or elevation in Italy. Future work will determine the genetic basis of such freezing tolerance variation, and whether genomic regions underlying variation in freezing tolerance might be involved in fitness tradeoffs across environments.

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1 - Purdue University, Botany & Plant Pathology and the Center for Plant Biology, 915 W State Street, West Lafayette, IN, 47907, USA

Freezing tolerance
Cold acclimation
Elevational cline
Winter annual
Latitudinal cline
local adaptation.

Presentation Type: Poster
Session: P, Physiology & Ecophysiology
Location: Grand Ballroom - Exhibit Hall/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PPE007
Abstract ID:726
Candidate for Awards:None

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