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The effects of temperature and moisture on CO 2 uptake and total resistance to water loss in the antarctic foliose lichen Umbilicaria antarctica
Author(s) -
HARRISSON P. M.,
WALTON D. W. H.,
ROTHERY P.
Publication year - 1989
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1989.tb02362.x
Subject(s) - thallus , photosynthesis , lichen , botany , biology , water content , horticulture , geology , geotechnical engineering
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.