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Abstract Detail



Ecophysiology

Veatch-Blohm, Maren [1], Roche, Bernadette [2].

Nickel tolerance variation in five disjunct populations of Arabidopsis lyrata ssp. lyrata..

Populations of Arabidopsis lyrata ssp. lyrata (L.) O’Kane & Al-Shehbaz grow in a variety of edaphic settings including calcareous sand, serpentine outcrops and alluvial flood plains. One of the major distinguishing characteristics of serpentine soils is the presence of the heavy metals nickel and chromium. We grew 5 disjunct populations of A. l. ssp. lyrata under Ni, Cr or control conditions to determine if the serpentine populations showed any evidence of local adaptation to serpentine like conditions and if so what might be involved in tolerance. All five populations grew well under control and Cr. With Ni exposure the three serpentine populations (Pilot, Soldier’s Delight, Robert E. Lee) had reduced but steady growth rates, the two non-serpentine populations (Jug Bay and Perry Preserve) were adversely affected, with reduced growth and survival. When all populations were exposed to Ni, the two non-serpentine populations accumulated significantly more Ni in their shoots than the three serpentine populations. In the roots the serpentine populations accumulated more Ni than the non-serpentine populations. The three serpentine populations had higher levels of phenolics within their shoots, with two of the three populations showing increased phenolic content under Ni exposure. On the other hand only the two non-serpentine populations showed increased antioxidant production under Ni exposure. Root phenolic and antioxidant contents differed among populations with phenolic and antioxidant production typically being higher in the three serpentine populations without any trend related to Ni exposure. Our data indicates population differentiation based on generations of exposure to Ni in the serpentine populations, where tolerance may in part be due to detoxification of Ni by phenolics.

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1 - Loyola University Maryland, 4501 N Charles Street, Baltimore, Maryland, 21210, United States
2 - Loyola University Maryland, Biology Department, 4501 N. Charles Street, Baltimore, MD, 21210, USA

Keywords:
Arabidopsis lyrata
serpentine.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Grand Salon A - D/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 5:30 PM
Number: PEP008
Abstract ID:635
Candidate for Awards:None


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