Is the emergence of embryos from hard seeds related to the structure of the cell walls of the micropylar endosperm , and not to endo-beta-mannanase activity?
The micropylar endosperm presents a lower physical constraint to the completion of germination than the lateral endosperm, and hence its structure is predisposed to permit radicle protrusion.
It is suggested that an offset loading because of the cantilever structure caused a high tensile stress on the distolingual edge, resulting in the fatigue fracture of the abutment.