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Recently Shukurov et al [Phys Rev E 72, 025302 (2008)], made use ofnon-orthogonal curvilinear coordinate system on a dynamo Moebius strip flow, toinvestigate the effect of stretching by a turbulent liquid sodium flow. Inplasma physics, Chui and Moffatt [Proc Roy Soc A 451,609,(1995)] (CM),considered non-orthogonal coordinates to investigate knotted magnetic flux tubeRiemann metric. Here it is shown that, in the unstretching knotted tubes,dynamo action cannot be supported. Turbulence there, is generated by suddenlybraking of torus rotation. Here, use of CM metric, shows that stretching ofmagnetic knots, by ideal plasmas, may support dynamo action. Investigation onthe stretching in plasma dynamos, showed that in diffusive media [Phys Plasma\textbf{15},122106,(2008)], unstretching unknotted tubes do not support fastdynamo action. Non-orthogonal coordinates in flux tubes of non-constantcircular section, of positive growth rate, leads to tube shrinking to aconstant value. As tube shrinks, curvature grows enhancing dynamo action.

Stretching magnetic fields by dynamo plasmas in Riemannian knotted tubes