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Lacunar gas discharge: a valid estimate of photosynthetic rates in submerged macrophytes?
Author(s) -
DROMGOOLE F. I.,
SORRELL B. K.
Publication year - 1987
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/j.1365-3040.1987.tb01830.x
Subject(s) - macrophyte , photosynthesis , oxygen , volume (thermodynamics) , environmental science , aquatic plant , botany , hydrology (agriculture) , chemistry , environmental chemistry , ecology , biology , geology , physics , thermodynamics , geotechnical engineering , organic chemistry
Photosynthetic oxygen produced by the submerged aquatic plant Egeria densa Planch, is partitioned into lacunar gas spaces and to the external medium. Despite an apparently linear relationship between volume of lacunar gas discharge and dissolved oxygen release under certain conditions, the partitioning is, as expected from theoretical considerations, not necessarily constant in different conditions. On this basis we believe that lacunar gas discharge is an inconsistent and therefore unreliable method of measuring photosynthesis in submerged macrophytes.