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DIFFERENTIAL EXPRESSION OF DIEL ACID METABOLISM IN TWO LIFE FORMS OF LITTORELLA UNIFLORA (L.) ASCHERS
Author(s) -
AULIO K.
Publication year - 1985
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.1469-8137.1985.tb02799.x
Subject(s) - crassulacean acid metabolism , botany , wax , diel vertical migration , biology , malic acid , photosynthesis , total inorganic carbon , ecology , carbon dioxide , biochemistry , citric acid
S ummary The shoreweed Littorella uniflora (L.) Aschers. possesses two life forms differing from each other both in morphological and in biochemical characteristics. The submerged (isoetid) form showed marked fluctuations in the levels of malic acid, as well as in the total titratable acidity, thus meeting the most important biochemical requirement of Crassulacean Acid Metabolism (CAM). In contrast, the terrestrial form, which depends on atmospheric sources of CO 2 , showed negligible variations in the levels of malate. The isoetid form has wax‐covered, functionless stomata, whereas the stomata of the terrestrial form are operative. Comparison of the two genetically uniform types of Littorella strongly supports the hypothesis that the CAM‐like carbon pathway is selected in submerged plants as an adaptation to the carbon shortage which they experience in daytime.