Abstract
Evidence has been presented showing that, inElodea densa Planchon leaves, the strong activation of electrogenic H+ extrusion by light depends on a photosynthesis-mediated stimulation of the plasmamembrane ATP-driven proton pump. In this work we present the results of a comparative investigation on different aquatic plant species, chosen on the basis of a wide taxonomic distribution, with the purpose to ascertain if the stimulating effect of photosynthesis on proton extrusion is a common mechanism among aquatic plants or if it is related to their phenotypic typology or taxonomic distribution. The data show that, in eight of the twelve tested species, illumination of excised leaves induced a photosynthesis-mediated (DCMU-sensitive) increase of the capacity to acidify the incubation medium, this effect being imputable to the activation of the plasmamembrane H + -ATPase. No correlation was found between the light-induced stimulating effect and the taxonomic position of the plant species. Among the morphological characters considered, only the presence of chloroplasts in the cells of epidermis appeared correlated with the positive response to light.
Riassunto
Gli autori hanno evidenziato in foglie diElodea densa Planchon la presenza di una pompa elettrogenica estrudente H + ATP-dipendente sita sul plasmalemma fortemente stimolata dalla luce (fotosintesi). Nella presenteNota si è voluto indagare se tale risposta alla luce fosse comune a tutte le piante acquatiche o se fosse correlata a determinate tipologie fenotipiche o alla loro posizione tassonomica. Allo scopo sono state considerate 12 specie spontanee nelle acque dolci italiane; in otto di queste è stata evidenziata una forte capacità di acidificare il mezzo di incubazione in presenza di luce. Non è stata evidenziata correlazione tra le piante ehe hanno mostrato risposta positiva e la loro posizione tassonomica. Tra i caratteri morfologici considerati solo la presenza di cloroplasti nelle cellule epidermiche sembra essere correlata positivamente alla risposta alla luce.
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Nella seduta del 24 aprile 1992.
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Albergoni, F.G., Marrè, M.T. & Venegoni, A. Ecologia-Photosynthesis-induced H+ extrusion in aquatic plants. A comparative study. Rend. Fis. Acc. Lincei 3, 353–360 (1992). https://doi.org/10.1007/BF03002941
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DOI: https://doi.org/10.1007/BF03002941