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Annals of Botany 89: 707-714, 2002
© 2002 Annals of Botany Company

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. WALDREN2

1School of Botany, Trinity College, Dublin 2, Ireland and 2Trinity College Botanic Gardens, Dartry, Dublin 6, Ireland

* For correspondence. Fax 00 353 1 6081147, e-mail delynn{at}tcd ie

Received: 22 October 2001; Returned for revision: 8 February 2002; Accepted: 28 February 2002.

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.

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


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