CAM-like Photosynthesis in Littorella uniflora (L.) Aschers.: The Role of Humidity

Abstract

The shoreweed Littorella uniflora (L.) Aschers. possesses two growth forms differing from each other both in morphological and ecological features. In two recent publications, opposite results have been reported on the occurrence of a CAM-like carbon pathway in the terrestrial form of L. uniflora. Experimental analysis in this paper reveals that the induction of diel acid metabolism requires saturated air humidity, conditions which rarely occur in nature.