Plasticity in hydraulic architecture: Riparian trees respond to increased temperatures with genotype-specific adjustments to leaf traits

Climate means and variability are shifting rapidly, leading to mismatches between climate and locally adapted plant traits. Phenotypic plasticity, the ability of a plant to respond to environmental conditions within a lifetime, may provide a buffer for plants to persist under increasing temperature and water stress. We used two reciprocal common gardens across a steep temperature gradient to investigate plasticity in six populations of Fremont cottonwood, an important foundation tree species in arid riparian ecosystems. We investigated two components of leaf hydraulic architecture: leaf venation and stomatal morphology, both of which regulate leaf water potential and photosynthesis. These traits will likely affect plant performance under climate stressors, but it is unclear whether they are controlled by genetic or environmental factors, and whether they respond to the environment in parallel or independent directions. We found that: 1) Populations had divergent responses to a hotter gr..., , , # Plasticity in hydraulic architecture: Riparian trees respond to increased temperatures with genotype-specific adjustments to leaf traits

**Dataset 1: vein_traits.csv**

This file lists information about each tree (Garden, Population, Genotype) and the trait values for that tree.

VTOTVD_mm = vein volume, vd_mm = vein density, witdth_mm = vein width, VLoop_mm = vein reticulation.

**Dataset 2: stomatal_traits**

This file lists information about each tree (Garden, Population, Genotype) and the trait values for that tree.

sd = stomata density, Gsmax_molperm2pers = Gsmax, Length_mm = stomata length.

**Dataset 3: growth.csv**

This file lists information about each tree (Garden, Population, Genotype) and the trait values for that tree.

All datasets:

* Please refer to Table 2 of the manuscript for the long form names of the populations (e.g., CAF-AUG = Agua Fria, Horseshoe).
* Garden column: AF = Agua Fria Garden, YU = Yuma Garden.
* Garden.MAT = Mean Annual temperature of the Garden ...