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The effect of temperature and oxygen on the CO 2 compensation point of the marine alga Ulva lactuca
Author(s) -
COLMAN BRIAN
Publication year - 1984
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11592150
Subject(s) - ulva lactuca , seawater , frond , compensation (psychology) , oxygen , lactuca , nitrogen , analytical chemistry (journal) , chemistry , compensation point , botany , environmental chemistry , biology , photosynthesis , ecology , organic chemistry , transpiration , psychology , psychoanalysis
The CO 2 compensation point of Ulva lactuca frond sections has been measured in artificial seawater using a sensitive gas‐chromatographic method. Under nitrogen the compensation point remained relatively constant at 3–6 cm 3 m −3 at temperatures from 10 to 30°C while in air‐saturated medium (0.3 kg m −3 O 2 ) the compensation point rose from 5 cm 3 m −3 at 10°C to 11 cm 3 m −3 at 30°C. These responses of the compensation point to temperature and oxygen concentration indicate that there is little photorespiratory CO 2 loss in this marine macroalga, and the low values of these compensation points indicate that inorganic carbon is actively accumulated by the plant.