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The Cachazo-Svrcek-Witten (CSW) rule for efficiently calculating gauge theoryamplitudes is extended to N=1 supersymmetric QCD (SQCD), incorporating masslessquarks, in a way preserving the manifest supersymmetry. Using this extended CSWrule, we obtain compact expressions of all the one-loop MHV amplitudes in SQCDincluding one or two external quark-antiquark (chiral-antichiral multiplets)pairs. The collinear sigularities of the five point amplitudes are investigatedto confirm the consistency of the results.Comment: 43pages,5figures,PTPTex;v2 2references and related footnote are  added;v3 English is improved, to appear in Prog. Theor. Phy

One-Loop Amplitudes in Supersymmetric QCD from MHV Vertices