Graduate Thesis Or Dissertation
 

Variation in metabolism, thallus characteristics, and water relations of three populations of Loboria pulmonaria from western Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/1n79h8180

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  • A physio-ecological study of Lobaria pulmonaria (L. ) Hoffm. was done to determine if geographic variation occurred within the species. Lobaria pulmonaria was collected from Table Mountain, Oak Creek, and Lost Prairie, located in the Coast Range, Willamette Valley, and Cascade Range respectively in Western Oregon. During 1971 and 1972 experiments were conducted to determine physical and chemical characteristics, thallus water content-water potential relations, and metabolic oxygen exchange rates in relation to light intensity, temperature, relative water content (RWC), and water potential. No differences were observed in the morphology, thallus area-density, presence of stictic and norstictic acids, chlorophyll concentrations, or metabolic response to temperature among the three populations of L. pulmonaria. However, results of other experiments indicated the possibility that L. pulmonaria has evolved intraspecific differences between the Oak Creek population and the montane groups. The Oak Creek population, situated in the most xeric habitat, showed a slow decrease in water potential as the plant lost water ( -0. 9 bars /%RWC); a relatively high light compensation point (>50 ft-c); a high light saturation point (1000 ft-c); a high tolerance to high light intensities before photo-inhibition occurred (±1900 ft-c); a low range of relative water content at maximum photosynthesis (53-75%); and an ability to maintain maximum net photosynthesis until water potential reached -12.5 bars. In contrast, the Table Mountain and Lost Prairie populations showed a rapid decrease in water potential as the plant lost water (-2.4 and -2.6 bars /%RWC respectively); a low light compensation point (<50 ft-c); a low light saturation point (440 and 300 ft-c respectively); a low tolerance to high light intensities indicated by photo-inhibition above 775 ft-c; and an inability to stay at maximum net photosynthesis once water potential dropped below -2.0 and -0.5 bars respectively. The Lost Prairie population was similar in its range of relative water content at maximum photosynthesis to that of the Oak Creek group (52-76%); however, the Table Mountain population had a higher range at 72 to 82%.
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