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ALL RIGHTS RESERVED iii COMMITTEE MEMBERSHIP TITLE: Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study AUTHOR: iv ABSTRACT Photosynthetic thermal tolerance and recovery to short duration temperature stress in desert and montane plants: A comparative study • Climate change models predict an increase in frequency and amplitude of extreme weather events, including heat waves. To better predict how the composition and distribution of plant assemblages might respond to these changes in temperature, it is important to understand how species currently respond to these extremes. Photosynthetic thermal tolerance (T 25) and photosynthetic recovery (RT 25) were quantified in 27 species. We also studied the relationships between T 25 , RT 25 and leaf mass per area (LMA). Leaf temperature was also monitored in the field. • Leaves used in this study were collected from two distinct environments representing desert and montane plant assemblages. T 25 and RT 25 were measured using a chlorophyll fluorescence protocol incorporating sub-saturating light and short duration heat stress. • Mean T 25 and LMA were significantly different between environments. Mean RT 25 was not significantly different between environments. There was a positive relationship between T 25 and LMA in both environments. • The ability to recover from heat stress does not differ between two biomes that experience vastly different mean maximum temperatures during the summer months. LMA is a predictive leaf trait for thermal tolerance. v ACKNOWLEDGMENTS The author gratefully acknowledges Boyd Deep Canyon Desert Research Center for site access, infrastructure, herbarium, and a laboratory as well as its director, Dr. Allan Muth. We further thank Kim Briones and Travis Parker for assistance in the field and Mark Fisher for technical assistance. Also, we thank Buford Crites and Friends of the Desert Mountains for access to the Santa Rosa Mountain cabin.