The effects of temperature and moisture on CO 2 uptake and total resistance to water loss in the antarctic foliose lichen Umbilicaria antarctica

summary Maximum net photosynthesis of field‐fresh thalli, illuminated at 200 μmol photons m −2 s −1 (PAR), was attained at 13 °C and 1.10 g g −1 water content. Small but significant rates of photosynthesis were measured at −5.5 °C. Depression of net photosynthesis at high thallus water contents is e...

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Bibliographic Details
Published in:New Phytologist
Main Authors: HARRISSON, P. M., WALTON, D. W. H., ROTHERY, P.
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 1989
Subjects:
Plant Science
Physiology
Antarctic
The Antarctic
Antarc*
Antarctica
Online Access:http://dx.doi.org/10.1111/j.1469-8137.1989.tb02362.x
https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1469-8137.1989.tb02362.x
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8137.1989.tb02362.x
https://nph.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1469-8137.1989.tb02362.x
Description
Summary:summary Maximum net photosynthesis of field‐fresh thalli, illuminated at 200 μmol photons m −2 s −1 (PAR), was attained at 13 °C and 1.10 g g −1 water content. Small but significant rates of photosynthesis were measured at −5.5 °C. Depression of net photosynthesis at high thallus water contents is explained in terms of thallus anatomy. Calculation of evaporative resistance of the thallus by a new method showed a moisture‐dependent response pattern, and was in agreement with direct observations made on other foliose species.

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