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Cultivars of red (Acer rubrum L.) and Freeman maple (Acer ×freemanii E. Murray) are popular ornamental plants which are commonly placed in a variety of landscapes. To date, little information quantifi es the capacity to toler- ate and recover from drought among cultivars of red and Freeman maple. The objective of this study was to compare the effects of water stress on the physiology of fi ve different maple cultivars of marketable size including four red maple genotypes, 'Summer Redʼ, 'October Gloryʼ (October Glory), 'Autumn Flameʼ, and 'Franksredʼ (Red Sunset), as well as one hybridized Freeman maple genotype, 'Jeffersredʼ (Autumn Blaze). Two-year-old cloned genotypes of red and Freeman maple were subjected to two treatments: irrigated daily to container capacity or irrigation withheld for one drought and recovery cycle. Light absorption, gas exchange, and chlorophyll fl uorescence measurements were conducted under well-watered and drought stress conditions that approached 0.070 m3 ·m -3 . Compared to well-watered conditions, drought stress conditions of 0.090 m 3 ·m -3 had a signifi cant main effect that reduced the amount of light absorption in four of the fi ve genotypes. Additionally, absorption among genotypes was different under both well-watered and water stress conditions. Over the course of drought stress and a recovery phase, net photosynthesis and stomatal conductance were different among genotypes. Maximum photosystem II (PSII) effi ciency of dark-adapted leaves (F v/Fm) was lowered by the water stress condition. The effi ciency of excitation capture by open PSII reaction centers (F v'/Fm') was variable among genotypes. Photochemical quenching was higher in Autumn Blaze, October Glory, and 'Summer Redʼ under drought conditions, which corresponded with a low degree of closure of PSII centers. Additionally, the fraction of ex- cess excitation energy was also lower. Lastly, water defi cit caused an increase in PSII effi ciency in all genotypes except Autumn Blaze. This research demonstrated physiological variation among commercially available red and Freeman maple genotypes that may be selected for drought tolerance based on site moisture characteristics. drought are known to exist among genotypes of red maple (Abrams and Kubiske, 1990), and it may be possible to select for this variability to manage cultivars in nursery and landscape conditions. The intent to tailor other tree species to soil condi- tions (e.g., Populus) through selective breeding, interspecifi c hybridization, and cloning has been based on genetic diversity within species (Stettler et al., 1988). Red maple (Acer rubrum L.) occurs naturally along a hydrologic continuum from wet to dry (Golet et al., 1993; Walters and Yawney, 1990) and has shown genotypic variability among sites of different soil moisture avail- ability (Abrams and Kubiske, 1990; Anella and Whitlow, 1998, 2000; Townsend and Roberts, 1973). In addition to the potential genetic diversity within the species, red maple can cross-pollinate

Genotypic Variability in Photosynthesis, Water Use, and Light Absorption among Red and Freeman Maple Cultivars in Response to Drought Stress