Phenotypic Plasticity in Acer rubrum Leaf Shape

This set of vocabulary flashcards covers key concepts from the study on how the leaf shape and teeth of Acer rubrum respond to temperature through phenotypic plasticity and genetic adaptation.

Phenotypic plasticity

The capacity of a single genotype to respond to environmental change by producing different physical traits.

Genotype

The genetic heritage of an organism that, along with phenotypic plasticity, determines plant traits.

Acer rubrum

The scientific name for Red Maple, the model species used in this study to examine temperature's effect on leaf dissection and tooth number.

MAT

Abbreviation for Mean Annual Temperature; a climate variable that shows an inverse relationship with the percentage of woody dicot species having leaf teeth.

MAP

Abbreviation for Mean Annual Precipitation; the average leaf area in woody dicot taxa is generally proportional to this climate variable.

Leaf dissection

The degree to which a leaf's margin is divided or cut; measured here by shape factor, compactness, and perimeter ratio.

Shape factor

A leaf dissection metric calculated as $4\times \text{area} / \text{perimeter}^2$, where lower values characterize highly dissected leaves.

Compactness

A measurement of leaf shape defined as $\text{perimeter}^2/ \text{area}$, used to quantify leaf dissection.

Perimeter ratio

The ratio of the total leaf perimeter to the internal perimeter after the teeth have been removed.

Leaf teeth

Prominent structures on leaf margins used by paleobotanists to reconstruct paleoclimate from fossils.

Paleoclimatology

The reconstruction of past climates from physical indicators in the fossil record, such as leaf characteristics.

Common garden experiment

A research design where plants from different seed sources are grown in the same environment to distinguish genetic differences from environmental responses.

Ecotypes

Genetically distinct populations within a species that have adapted to specific climatic conditions.

Carbon assimilation

The process of converting inorganic carbon (CO2) to organic compounds; enhanced by leaf teeth early in the growing season in cold climates.

Hydathodal leaf teeth

Structures that prevent the flooding of leaf mesophyll by allowing water to exit via guttation.

Guttation

The process of forced water secretion from leaf teeth, which may help prevent freezing-induced embolisms in cold climates.

Acer rubrum var. rubrum

A variety of Red Maple found in northern locations like Ontario and Pennsylvania, typically producing more dissected leaves with prominent teeth.

Acer rubrum var. trilobum

A southern variety of Red Maple that generally has less dissected leaves compared to northern varieties.

Time-lag effect

The delay in a trait's response to environmental shift; significant if a trait's plasticity is weak during periods of rapid climate change.

Sun phenotypes

Leaf forms produced under full sun conditions, which characterized all samples in the study due to the plants' small stature and wide spacing.