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We present a model of dark energy based on the string effective action, andon the assumption that the dilaton is strongly coupled to dark matter. Wediscuss the main differences between this class of models and more conventionalmodels of quintessence,uncoupled to dark matter. This paper is based on talkspresented at the "VII Congresso Nazionale di Cosmologia" (OsservatorioAstronomico di Roma, Monte Porzio Catone, November 2002), and at the Meeting"Dark Energy Day" (University of Milano-Bicocca, November 2002). To appear inthe Proc. of the International Conference on ``Thinking, Observing and Miningthe Universe" (Sorrento, September 2003), eds. G. Longo and G. Miele (WorldScientific, Singapore).Comment: 8 pages, latex, 4 figures included using eps

LATE-TIME EFFECTS OF PLANCK-SCALE COSMOLOGY: DILATONIC INTERPRETATION OF THE DARK ENERGY FIELD