Journal Article

Physiological Variation in Populations of Ranunculus repens L. (Creeping Buttercup) from the Temporary Limestone Lakes (Turloughs) in the West of Ireland

D. E. LYNN and S. WALDREN

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 89, issue 6, pages 707-714
Published in print June 2002 | ISSN: 0305-7364
Published online June 2002 | e-ISSN: 1095-8290 | DOI: https://dx.doi.org/10.1093/aob/mcf125
Physiological Variation in Populations of Ranunculus repens L. (Creeping Buttercup) from the Temporary Limestone Lakes (Turloughs) in the West of Ireland

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  • Ecology and Conservation
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A dissected‐leaved form of Ranunculus repens L. occurs in the temporary limestone lakes (turloughs) across the west of Ireland. Turloughs fill with groundwater for up to 8 months of the year. Under experimental conditions, these turlough populations demonstrated a higher rate of aerial and submerged photosynthesis than populations of the more typical broad‐leaved ruderal form. The turlough populations also had higher rates of stomatal conductance and exhibited a higher stomatal index on the upper leaf surface and a lower index on the lower leaf surface than the ruderal populations. Neither population could utilize bicarbonate to any great extent, with rates of photosynthesis under submerged conditions being only 5 % of aerial rates. Respiration under submerged conditions was significantly higher in the turlough populations than in ruderal populations, and it is hypothesized that the more dissected leaf shape of the turlough population may have a thinner boundary layer and thus enhance gas exchange in submerged conditions.

Keywords: Key words:Ranunculus repens L., creeping buttercup, turloughs, amphibious plants, flooding, stomatal index, submerged photosynthesis, submerged respiration.

Journal Article.  5225 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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