UV tolerance in Mojave Desert mosses

Abstract

Terrestrial mosses dehydrate and go quiescent between precipitation events. Although many mosses are found in cool, low light environments, a number are abundant in drylands. We investigated the effects of ultraviolet (UV) radiation on the desert moss Syntrichia caninervis. This species is highly desiccation tolerant; it can lose almost all of its cellular water and recover after rehydration. In nature, desert mosses not only have to withstand the damage of desiccation itself but must also be able to recover from any damage incurred while dry, or have adequate mechanisms for injury prevention. They have no ability for active repair when quiescent and face risk of damage to sensitive molecules, including DNA, which absorbs UV wavelengths. We used chlorophyll fluorescence and transcriptomics in field and laboratory experiments to better understand the dimensions of UV tolerance in S. caninervis.

Date
Jul 30, 2019
Location
Tucson, Arizona
Jenna Ekwealor
Jenna Ekwealor
PhD Candidate

I am a UC Berkeley PhD Candidate studying evolution & eco-physiology of desiccation-tolerant desert mosses.