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RATE OF PHOTOSYNTHESIS AND RESPIRATION IN DIFFERENT LICHEN TISSUES BY THE CARTESIAN DIVER TECHNIQUE
Author(s) -
Pearson L. C.,
Brammer Erik
Publication year - 1978
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1978.tb06069.x
Subject(s) - biology , compensation point , lichen , photosynthesis , botany , respiration , respiration rate , transpiration
The Cartesian diver technique has been used for measuring respiration in Protozoa, small crustaceans, insects, and in animal tissue; it can also be used to measure both respiration and photosynthesis in unicellular plants and in plant tissues. In two lichens, Peltigera canina and Evernia prunastri , algal‐containing tissues were more than 2½ times as active metabolically as medulla. In Peltigera , cortex was slightly more active, rhizines about equally active, and apothecia about a tenth as active as medulla. Light compensation point and peak rates of apparent photosynthesis were reached at higher light intensities in Evernia than in Peltigera . In both lichens, light seemed to retard respiration in the medulla.