Lloyd Stark

Lloyd Stark

Professor Emeritus

Life Sciences
Mail Code


The primary theme in Dr. Stark's lab is the ecology of vegetative desiccation tolerance in plants. Desiccation tolerance (DT) is the ability of an organism or structure to survive drying out in equilibration with dry air, and among plants is most well developed among the bryophytes. In their lab, various species of mosses are cultured and bred, with experiments on DT normally based on single clonal lines. They are interested in determining the instrinsic ecological strategy of DT employed by a species; this strategy resides along an inducibility gradient, from weakly inducible to nearly constitutive. Experimental topics include the DT of vegetative and reproductive phases, the physiology and timelines of hardening and dehardening phenomena, how different life phases of mosses (shoots, asexual propagules, antheridia, juvenile structures) exhibit variation in response to desiccation stress, and the length of time structures can tolerate continuous desiccation. Specifically, their laboratory is investigating how the three components of desiccation tolerance, (i) the rate of drying, (ii) the duration spent in the dried state, and (iii) the equilibrium relative humidity reached, affect the capacity of a plant to tolerate desiccation. We focus on desert and Mediterranean mosses.

Dr. Stark's graduate students are studying (i) the desiccation tolerance in Bryum argenteum life phases and hardening to DT in Physcomitrella and (ii) how the environment within the moss colony compares to the ambient environment, how this potential buffer varies along an elevation gradient in the desert, and including how this phenomenon relates to projected climate change.  


Ecological Desiccation Tolerance of Bryophytes, Reproductive Biology and Life History of Bryophytes, Desert Bryophytes

Additional Information

SEB Program Group: Arid Lands Soil-Plant-Water Stress Interactions
SEB Lab Location: 4156
SEB Lab Phone Number: 702-895-4144