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The gluino-induced contributions to the decay b-> s gamma are investigated insupersymmetric frameworks with generic sources of flavour violation. It isshown that, when QCD corrections are taken into account, the relevant operatorbasis of the Standard Model effective Hamiltonian gets enlarged to contain: i)magnetic and chromomagnetic operators with a factor of alpha_s and weighted bya quark mass m_b or m_c; ii) magnetic and chromomagnetic operators of lowerdimensionality, also containing alpha_s; iii) four-quark operators weighted bya factor alpha_s^2. Numerical results are given, showing the effects of theleading order QCD corrections on the inclusive branching ratio for b-> s gamma.Constraints on supersymmetric sources of flavour violation are derived.Comment: 36 pages including 16 postscript figures; uses epsf; journal version:  one ref. added; rephrasing of a couple of paragraph

Gluino contribution to radiativeBdecays: Organization of QCD corrections and leading order results