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We discuss the role of striction in the intertwined magnetic and structuralphase transitions in the underdoped iron-pnictides. The magneto-elasticcoupling to acoustic modes is then derived and estimated in framework of themultiband spectrum for itinerant electrons with nesting features. We argue thatthe 1-st order character of the magneto-elastic phase transition originatesfrom the lattice instabilities near the onset of spin-density wave orderintroducing, thus, a shear acoustic mode as a new order parameter. Takingnon-harmonic termis in the lattice energy into account may explain thesplitting of the structural and magnetic transitions in some oxypnictides.Fluctuations of the magnetic order parameter show up in the precursorytemperature dependence of the elastic moduli.

The role of striction at magnetic and structural transitions in iron-pnictides