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Abstract Detail

Recent Topics Posters

Llaneza-Garcia, Estefania [1], Rosenstiel, Todd [2], Eppley, Sarah [3].

Living on the edge: exploring the mechanisms of high-temperature tolerance in geothermal moss.

The ability to survive long-term exposure to extreme temperatures is being investigated in three moss species (Ceratodon purpureus, Campylopus introflexus, and Aulacomnium palustre) growing near the thermal limits of plant life (~50°C) on geothermal sites in Lassen Volcanic National Park (LVNP), California. Specifically, this study focuses on the following temperature sensitive physiological mechanisms: 1) photosynthesis/ respiration interactions and 2) isoprene emission. At high temperatures, respiration rates increase, causing an increase in carbon loss. I propose that photosynthetic activity must then be increased in moss growing on geothermal hot-springs to a rate that can compensate for such carbon loss to respiration. The current understanding of isoprene emission by plants suggests that isoprene plays a temperature protective role in isoprene-emitting species. I will test whether isoprene emission constitutes a thermoprotective mechanism in these three moss species growing in LNVP. The moss species examined in this study will be cultured through vegetative propagation and grown at high temperatures in the lab. Photosynthetic tests such as chlorophyll fluorescence and oxygen evolution as well as isoprene emission measurements will be conducted in both the field and the lab. Results from these experiments will increase our understanding of the physiological mechanisms behind plant survival and growth at extreme temperatures. As global warming further increases, studies on mechanisms that allow plants to withstand high growth temperatures are becoming valuable tools for estimating the direct effects of global warming on plants. Understanding the physiological tradeoffs required for living at high temperatures can help to make predictions about the impact of rising global temperatures on plant survival.

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1 - Portland State University, Biology, 1719 SW 10th Avenue, Portland, Oregon, 97201, US
2 - Portland State University, Biology, 1719 SW 10th Avenue, Portland, Oregon, 97201
3 - Portland State University, Biology Department, Po Box 751, Portland, Oregon, 97207-0751, USA

temperature stress
chlorophyll fluorescence

Presentation Type: Recent Topics Poster
Session: P
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM
Number: PRT019
Abstract ID:1147

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