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Updated: May 15, 2025

Relating Stomatal Conductance to Leaf Functional Traits
Published on: October 12, 2015
Differences in stomatal conductance between leaf shape genotypes of Ipomoea hederacea suggest divergent
Yash Kumar Singhal1, Julia Anne Boyle1,2, John R Stinchcombe1,3
1Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada.
Abstract:
Intraspecific variation in leaf shape affects many physiological processes but its impact on plant distribution is underexplored. Using a common garden, we studied daytime thermoregulation of lobed and entire leaf genotypes of Ipomoea hederacea, which displays a latitudinal leaf shape cline. Both leaf shapes maintained similar temperatures but entire leaf genotypes had significantly increased stomatal conductance in warmer/sunnier weather. With less potential water loss, lobed genotypes may have advantages in drier conditions. Lobed genotypes are more common in the north of the species' range, which receives less summer precipitation, suggesting water availability as a potential clinally varying selective agent.
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