Plant material
We collected branches from three to five individuals of each of four
woody species varying strongly in leaf morphology and trichome depth
(Table 2) growing on the UC Davis campus (Davis, CA,
35.54oN, 121.75oW), recut them under
water upon return to the laboratory, and allowed them to equilibrate for
at least one hour in darkness before beginning measurements. For the
fifth species (Solanum lycopersicon , SOLY), we compared leaves
from five plants from each of two mutant genotypes (Wo , wooly;h , hairless) in the same genetic background (known as ’Ailsa
Craig’). SOLY seeds were provided by the UC Davis Tomato Genetics
Resource Center. We grew SOLY plants under LED lights in the laboratory
for a month before experiments.