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A theoretical approach to the influence of one-dimensional latticefluctuations on electronic properties in weakly localized spin-Peierls systemsis proposed using the renormalization group and the functional integraltechniques. The interplay between the renormalization group flow of correlatedelectrons and one-dimensional lattice fluctuations is taken into account by theone-dimensional functional integral method in the adiabatic limit. Calculationsof spin-Peierls precursor effects on response functions are carried outexplicitely and the prediction for the temperature dependent magneticsusceptibility and nuclear relaxation is compared with available experimentaldata for (TMTTF)$_{2}$PF$_{6}$.Comment: 15 pages, 7 Encapsulated Postscript figure

Theory of Lattice and Electronic Fluctuations in Weakly Localized Spin-Peierls Systems