Photosynthesis in aquatic adventitious roots of the halophytic stem-succulent Tecticornia pergranulata (formerly Halosarcia pergranulata).

摘要: In flood-tolerant species, a common response to inundation is growth of adventitious roots into the water column. The capacity for these become photosynthetically active has received scant attention. experiments presented here show aquatic flood-tolerant, halophytic stem-succulent, Tecticornia pergranulata (subfamily Salicornioideae, Chenopodiaceae) are photosynthetic and quantify first time terrestrial species. Fluorescence microscopy was used determine presence chloroplasts within cells roots. Net O(2) production by excised roots, when underwater, measured with varying light CO(2) regimes; apparent maximum (P(max)) underwater net photosynthesis in 0.45 micromol m(-2) s(-1). potential supported immunolocalization PsbA, major protein photosystem II, ribulose-1-5-bisphosphate carboxylase/oxygenase (Rubisco) root extracts. Chlorophyllous T. active, such activity previously unrecognized source O(2), potentially carbohydrates, flooded submerged plants.