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We present a N=1 Supersymmetric extension of a spin-charge separatedeffective $SU(2)\times U_S(1)$ `particle-hole' gauge theory of excitationsabout the nodes of the gap of a d-wave planar magnetic superconductor. Thesupersymmetry is achieved without introducing extra degrees of freedom, ascompared to the non-supersymmetric models. The only exception, the introductionof gaugino fieds, finds a natural physical interpretation as describinginterlayer coupling in the statistical model. The low-energy continuum theoryis described by a relativistic (2+1)-dimensional supersymmetric $CP^1$$\sigma$-model with Gross-Neveu-Thirring-type four-fermion interactions. Weemphasize the crucial r\^ole of the $CP^1$ constraint in inducing a non-trivialdynamical mass generation for fermions (and thus superconductivity), in a waycompatible with manifest N=1 supersymmetry. We also give a preliminarydiscussion of non-perturbative effects. We argue that supersymmetry suppressesthe dangerous for superconductivity instanton contributions to the mass of theperturbatively massless gauge boson of the unbroken U(1) subgroup of SU(2).Finally, we point out the possibility of applying these ideas to effectivegauge models of spin-charge separation in one-space dimensional superconductingchains of holons, which, for example, have recently been claimed to beimportant in the stripe phase of underdoped cuprates.Comment: 19 pages LATEX (minor misprints in formula (43) corrected

N=1 SUPERSYMMETRIC SPIN-CHARGE SEPARATION IN EFFECTIVE GAUGE THEORIES OF PLANAR MAGNETIC SUPERCONDUCTORS